Data releases from the Division of Lands and Minerals

The DNR is responsible for administering more than twelve million acres of State-owned and State-managed mineral rights. DNR geologists increase their understanding of the estate’s mineral potential through graphical and statistical analysis of scientific data. Their mineral potential evaluations are based on new scientific data from geological and geochemical surveys that supplements information obtained from previous DNR projects and historical exploration records. The DNR then applies this knowledge to issues that arise pertaining to the state’s mineral estate, such as mineral potential reviews for proposed land transactions.

It is the DNR’s policy to publically release the raw analytical data obtained for these mineral potential projects within thirty days of receiving it from a third-party laboratory. The data is subsequently analyzed, and placed into context by open-file reports that are made available to the public sometime after this initial data release. This web page archives mineral potential data release announcements, and provides links to more detailed project description pages where specific data files can be viewed and downloaded. The format of each data release varies depending on the project.

Further information on published mineral related reports and open-file projects conducted by the Lands and Minerals Division is now available online.

For questions on any of the data releases and projects listed below (unless noted otherwise in a project description), please contact:

Don Elsenheimer
500 Lafayette Road 
St. Paul, Minnesota 55155-4045
tel. 651-259-5433 
fax 651-296-5939 
donald.elsenheimer@state.mn.us


November 2014

November 5, 2014 - Geochemical Analysis of Four Saprolite Samples, Northeastern Aitkin County, Minnesota

Project LeaderDon Elsenheimer

Mineral Potential Project: #394

The MnDNR is today releasing third-party analytical results from four (4) saprolite samples in Northeastern Aitkin County, Minnesota. These samples were obtained from rotosonic drill cores completed by a mineral exploration company that is investigating a known copper-nickel bedrock deposit that is overlain by a relatively thick layer of glacial sediments and saprolite. Activation Laboratories (ActLabs) provided the third-party laboratory multi-element analyses on representative splits of both the bulk sample and the silt and clay fraction (-63micron).

Logs of these four rotosonic drill cores and related cross-sections were released in September, 2014. The analytical results obtained from samples taken from eleven (11) associated cores reviewed in 2013 have also been previously released.

Today’s data release includes a laboratory analytical report, a rare earth element plot, a laboratory data spreadsheet and a worksheet that combines analytical results from all fifteen cores. These documents, and a more detailed description of the project, are available for download at the DNR’s website:

http://www.dnr.state.mn.us/lands_minerals/mpes_projects/project394.html

 


September 2014

September 17, 2014 - Rotosonic Drill Core Descriptions and Interpretation of Glacial Sediment and Saprolite, Northeastern Aitkin County, Minnesota

Project LeaderDon Elsenheimer

Mineral Potential Project: #394

The MnDNR is today releasing drill core logs, cross-sectional depictions, and associated files for fifteen (15) Rotosonic borings in Northeastern Aitkin County, Minnesota.  These borings were completed by a mineral exploration company that is investigating a known copper-nickel bedrock deposit that is overlain by a relatively thick layer of glacial sediments and saprolite.  The goal of this project work is to evaluate whether layers of saprolite and clay-rich glacial sediment affect the efficacy of the soil gas hydrocarbon (SGH) procedure developed by Activation Laboratories, Ltd. (ActLabs) for delineating mineralized bedrock targets by sampling soil material that is inexpensive to collect when compared to drill core samples.

The released logs and cross-sections help characterize the extent of both saprolite and clay-rich glacial sediments within the area, and were used to guide the selection of samples for geochemical analysis.  The analytical results obtained from samples taken from the eleven (11) cores reviewed in 2013 have been previously released.  Samples obtained from the four (4) cores reviewed in August 2014 have been sent to a third-party laboratory for analysis; the results, once obtained, will be provided in a future data release.

Today’s data release includes drill logs, a sample location map, an associated GIS shapefile, and a spreadsheet with sample locations and related field data.  These documents, and a more detailed description of the project, are available for download at the DNR’s website:

http://www.dnr.state.mn.us/lands_minerals/mpes_projects/project394.html

 


June 2014

June 13, 2014 - DNR Open-File Project 392: Regional Survey of Gold in Till, Cook Area, St. Louis County

Project LeaderDon Elsenheimer

Mineral Potential Project: #392

The DNR is today releasing geochemical analytical results from the silt and clay fraction and magnetic and non-magnetic heavy mineral concentrates from thirty-four (34) glacial sediment samples collected in Northern St. Louis County, at locations where State- or County-controlled surface ownership overlies State-owned or State-administered mineral rights. This is the latest data release for a DNR geological investigation that began in July, 2012, within an approximately 200 square mile area of historical gold and base metal exploration that lies between Cook and Tower.  In this region, an Archean granite-greenstone terrane is overlain by relatively thin layers of Rainy Lobe till and other glacially-derived sediments.  These are ideal geological conditions for using gold grain counts and heavy mineral geochemistry in glacial sediment samples to explore for proximal bedrock mineralization.

The 34 glacial sediment samples were collected in October 2013, and sent to Overburden Drilling Management, Ltd, (ODM) for heavy mineral concentrate (HMC) separation and gold grain counts.  The results of this processing and gold grain analysis were released by the DNR on December 19, 2013 (see this data release for a sample location map). Sample locations were based on initial results from 105 glacial sediment samples that were collected within the project area in October 2012, processed by ODM, and assayed by Activation Laboratories Limited (ActLabs). The DNR released those results to the public on February 4, 2013 and July 2, 2013. 

Today’s data release includes a January, 2014 analytical report from Activation Laboratories, Ltd. (ActLabs) and associated spreadsheet files.  These documents, and a more detailed description of the project, are available at the DNR’s web site.

http://www.dnr.state.mn.us/lands_minerals/mpes_projects/project392.html

Representative sample splits from these 34 samples have been forwarded to ActLabs for assay and geochemical analysis. The results of this pending analytical work will be released to the public in a future data release.  

Note: While the identification of gold grains in glacial sediment samples may bolster the assessed mineral potential of an area, it is not a determinable test (either positive or negative) for bedrock mineralization. This type of geological investigation should be considered only the first step in determining whether there are bedrock gold deposits in the area. The DNR uses this data for land management purposes.  


April 2014

April 17, 2014 - AITKIN COUNTY SAND AND GRAVEL RESOURCE POTENTIAL MAP AND GIS DATA RELEASED

Sand and gravel resource potential mapping has been completed for Aitkin County. A map and related GIS data are now available for public distribution. The GIS data produced for this project includes: sand and gravel potential, survey of gravel pits, geologic field observations, test hole locations, and sand and gravel sampling results. You can access this information by:

Other Notes - A crushed stone resource potential plate for Aitkin County and an associated GIS dataset will be published at a later date.


January 2014

January 31, 2014 - DNR Open-File Project 394: Test of the SGH Soil Survey Method

Project LeaderDon Elsenheimer

Mineral Potential Project: #394

The DNR is testing the effectiveness of a proprietary geochemical exploration technique in an area of known copper-nickel mineralization in Aitkin County, Minnesota. In case studies outside of Minnesota, the soil gas hydrocarbon (SGH) procedure developed by Activation Laboratories, Ltd. (ActLabs) has delineated mineralized bedrock targets buried under thick layers of overburden by extracting and analyzing organic compounds trapped on surficial sediment. The goal of this MnDNR project is to test the method’s efficacy in an area of known bedrock mineralization that is overlain with layers of both saprolite and clay-rich glacial till. The project combines SGH surface soil sampling with detailed characterization of till and saprolite samples obtained from existing rotosonic drill cores.

In October 2013, the DNR collected surface materials from 152 sample locations and sent them to ActLabs for SGH analysis and interpretation. The samples were located within a grid that was proximal to a previously sampled grid (see July 2, 2013 data release). ActLabs performed the analysis, and provided the DNR the results in an interpretive report dated January 27, 2014. The DNR is today releasing the report, a sample location map, and a spreadsheet with sample locations and related field data. These documents, and a more detailed description of the project, are available for download at the DNR’s website:

http://www.dnr.state.mn.us/lands_minerals/mpes_projects/project394.html

The DNR will review these results in conjunction with those obtained in the first phase of the project, and will write a final report for this project.


December 2013

December 19, 2013 - DNR Open-File Project 392: Regional Survey of Gold in Till, Cook Area, St. Louis County

Project LeaderDon Elsenheimer

Mineral Potential Project: #392

The DNR is today releasing preliminary results from the processing and analysis of thirty-four (34) glacial sediment samples collected in Northern St. Louis County, at locations where State- or County-controlled surface ownership overlies State-owned or State-administered mineral rights. This is the latest data release for a DNR geological investigation that began in July, 2012, within an approximately 200 square mile area of historical gold and base metal exploration that lies between Cook and Tower.  In this region, an Archean granite-greenstone terrane is overlain by relatively thin layers of Rainy Lobe till and other glacially-derived sediments.  These are ideal geological conditions for using gold grain counts and heavy mineral geochemistry in glacial sediment samples to explore for proximal bedrock mineralization.

The 34 glacial sediment samples were collected in October 2013, and sent to Overburden Drilling Management, Ltd, (ODM) for heavy mineral concentrate (HMC) separation and gold grain counts.  Sample locations were based on initial results from 105 glacial sediment samples that were collected within the project area in October 2012, processed by ODM, and assayed by Activation Laboratories Limited (ActLabs). The DNR released those results to the public on February 4, 2013 and July 2, 2013. 

Today’s data release includes an ODM report dated December 5, 2013 that documents HMC separation and gold grain count work for the 34 new samples, a sample location  map, and associated spreadsheet files.  These documents, and a more detailed description of the project, are available for download at the DNR’s website:

http://www.dnr.state.mn.us/lands_minerals/mpes_projects/project392.html

Representative sample splits from these 34 samples have been forwarded to ActLabs for assay and geochemical analysis. The results of this pending analytical work will be released to the public in a future data release.  

Note: While the identification of gold grains in glacial sediment samples may bolster the assessed mineral potential of an area, it is not a determinable test (either positive or negative) for bedrock mineralization. This type of geological investigation should be considered only the first step in determining whether there are bedrock gold deposits in the area. The DNR uses this data for land management purposes. 


July 2013

July 16, 2013 - DNR Open-File Project 391: Cook Area Drill Core Re-Logging and Sampling, St. Louis County

Project Leader:Barry Frey

Mineral Potential Project#391

This new work consists of laboratory analysis of 65 drill core samples (including standards) by Activation Laboratories Ltd. of Ancaster, Ontario. The samples were selected from 5 drill cores that had been drilled during the 1960’s through the 1980's, primarily by exploration companies searching for base metals and gold. Drill core and related exploration data are currently available at the Minnesota Department of Natural Resources Drill Core Library in Hibbing, Minnesota.

Sampling was guided by re-logging of the core and also by the use of a hand-held X-Ray Fluorescence (XRF) analyzer instrument. Files contain these new sample assays including standards and duplicates, XRF data, standards information, rare-earth element plots, and core locations. The chemistry from the XRF analyses is semi-quantitative by nature, and should NEVER be mixed with laboratory analyses and assays.

Digital data files and a reference map can be downloaded from the following webpage:

http://www.dnr.state.mn.us/lands_minerals/mpes_projects/project391.html

 

July 9, 2013 - DNR Open-File Project 389: Heavy Mineral Concentrate Assays, St. Louis and Lake Counties

Project Leader:Don Elsenheimer

Mineral Potential Project#389

In 1989, the Minnesota DNR identified anomalously high platinum and palladium concentrations in the heavy mineral concentrates of glacial sediment obtained from five-foot auger samples, at locations 20-30 miles east of the known areas of metallic mineral deposits (MnDNR Project 262). The goal of DNR Project 389 was to determine whether these results could be confirmed by shallow surface samples, and determine whether similar anomalies can be linked to bedrock map units or features in the general area. A total of 127 glacial sediment samples were collected in Fall 2011; the heavy mineral concentrates (HMC) from 96 of these samples were separated, and analyzed by ALS Minerals for Pt, Pd, and Au concentrations.

In June 2013, the DNR selected 10 of these samples for electron microprobe analysis by McSwiggen & Associates. Polished grain mounts were prepared using the magnetic fraction of the HMC from each sample and examined using backscatter electron imagery. Oxide compositions were determined by point analysis of 25-30 grains within each mount. These analytical results and a compilation of backscatter electron images were provided to the DNR by McSwiggen & Associates on July 1, 2013.

This data and a reference map can be downloaded from the following webpage:

http://www.dnr.state.mn.us/lands_minerals/mpes_projects/project389.html

 

July 2, 2013 - DNR Open-File Project 394: Test of SGH Soil Survey Method

Project Leader:Don Elsenheimer

Mineral Potential Project#394

The Minnesota DNR (MnDNR) is testing the effectiveness of a proprietary geochemical exploration technique in an area of known copper-nickel mineralization in Aitkin County, Minnesota. This project combines the collection and analysis of surface materials using the soil gas hydrocarbon (SGH) procedure developed by Activation Laboratories, Ltd. (ActLabs) with detailed characterization of underlying till and saprolite samples obtained from existing rotosonic drill cores within the project area.

Today’s data release includes the following:

  • Field data, and a laboratory report associated with the collection of 188 SGH samples by the MnDNR in May 2013;
  • Geochemical results for twenty two (22) silt+clay fractions obtained from existing rotosonic drill core samples of till and saprolite; and,
  • Geochemical results from Neutron Activation Analysis (NAA) of the magnetic and non-magnetic fractions of Heavy Mineral Concentrates (HMC) from 22 rotosonic drill core samples of till and saprolite.

The maps, spreadsheets, and reports included within this data release can be downloaded from the following page:

http://www.dnr.state.mn.us/lands_minerals/mpes_projects/project394.html

MnDNR is analyzing the raw data contained within this data release, and will provide a discussion and analysis of these results in a future open file report.

 

July 2, 2013 - DNR Open-File Project 392: Regional Survey of Gold in Till, Cook Area, St. Louis County

Project Leader:Don Elsenheimer

Mineral Potential Project#392

The DNR is conducting a regional survey of gold in till in the Cook Area of St. Louis County, an approximately 200 square mile area of historical gold exploration. In this region, an Archean granite-greenstone terrane is overlain by relatively thin layers of Rainy Lobe till and other glacially-derived sediments.

A total of 105 till samples on State-owned or State administered mineral rights were previously processed by Overburden Drilling Management, Ltd, (ODM) for heavy mineral concentrate (HMC) separation and gold grain counts (See February 4, 2013 data release). The HMC was sent to Activation Laboratories, Ltd. (ActLabs) for geochemical analysis. The results of this ActLabs multi-element neutron activation analysis were provided to the DNR on June 27, 2013. This report and associated spreadsheet files can be downloaded from the following page:

http://www.dnr.state.mn.us/lands_minerals/mpes_projects/project392.html

 


June 2013

June 19, 2013 - DNR Open-File Project 394: Test of SGH Soil Survey Method

Project LeaderDon Elsenheimer

Mineral Potential Project#394

The Minnesota DNR (MnDNR) is testing the effectiveness of a proprietary geochemical exploration technique in an area of known copper-nickel mineralization in Aitkin County, Minnesota.  In case studies outside of Minnesota, the soil gas hydrocarbon (SGH) procedure developed by Activation Laboratories, Ltd. (ActLabs) has delineated mineralized bedrock targets buried under thick layers of overburden by extracting and analyzing organic compounds trapped on surficial sediment.  The goal of this MnDNR project is to test the method’s efficacy in an area of known bedrock mineralization that is overlain with layers of both saprolite and clay-rich glacial till.  The project combines SGH surface soil sampling with detailed characterization of existing rotosonic drill cores of the overburden and saprolite.

In March 2013, the MnDNR collected twenty-two (22) samples of saprolite and till from eleven (11) existing rotosonic drill cores obtained locations within the project area.  These samples were submitted to Overburden Drilling Management Ltd (ODM) for heavy mineral concentrate and silt+clay fraction separations.  These processed materials have been sent by ODM to ActLabs for third-party geochemical analysis.  A reference map and the ODM processing reports (provided to MnDNR on June 11, 2013) can be downloaded from the following page:

http://www.dnr.state.mn.us/lands_minerals/mpes_projects/project394.html

 


March 2013

March 13, 2013 - DNR Open-File Project 389:Heavy Mineral Concentrate Assays, St. Louis and Lake Counties

Project LeaderDon Elsenheimer

Mineral Potential Project#389

In 1989, the Minnesota DNR identified anomalously high platinum and palladium concentrations in the heavy mineral concentrates within glacial till samples collected 20-30 miles east of the known areas of metallic mineral deposits (MnDNR Project 262). The goal of DNR Project 389 was to confirm these results, and determine whether similar anomalies can be tied to specific bedrock targets south of the Project 262 area. A total of 127 glacial till and outwash samples were collected in Fall 2011; the heavy mineral concentrates from 96 of these samples were separated, and analyzed by ALS minerals for Pt, Pd, and Au concentrations.

This data and a reference map can be downloaded from the following webpage:

http://www.dnr.state.mn.us/lands_minerals/mpes_projects/project389.html

 


February 2013

February 4, 2013 - DNR Open-File Project 392: Regional Survey of Gold in Till, Cook Area, St. Louis County

Project Leader: Don Elsenheimer

Mineral Potential Project#392

The DNR is conducting a regional survey of gold in till in the Cook Area of St. Louis County, an approximately 200 square mile area of historical gold exploration. In this region, an Archean granite-greenstone terrane is overlain by relatively thin layers of Rainy Lobe till and other glacially-derived sediments. 

In September and October, 2012 the Mn DNR collected 105 till samples on State-owned or State-administered mineral rights. The Mn DNR submitted these samples to Overburden Drilling Management, Ltd, (ODM) for heavy mineral concentrate separation and gold grain counts.

This data and a reference map can be downloaded from the following webpage:

http://www.dnr.state.mn.us/lands_minerals/mpes_projects/project392.html

 


October 2012

October 3, 2012
OPEN-FILE: DIMENSION STONE INVENTORY OF NORTHERN MINNESOTA

Project Leader: Matt Oberhelman
Lands and Minerals Division
Hibbing Office
tel. 218-231-8465
matt.oberhelman@state.mn.us

Project Number: 298-3

Two new dimension stone prospect sites have been located in Lake County.

Dimension stone prospect Site L-210 is a black anorthositic gabbro located in T61-R11-36-SWSE.

Site L-231 is a dark gray troctolitic anorthosite located inT61-11-16 NW1/4 NE1/4, NE1/4 NW1/4, SE1/4 NW1/4, SW1/4NE1/4. Both sites exhibit good quarry block potential.

Further mineral rights and land issues will need to be addressed prior to a State offering these sites for industrial mineral leases.

October 1, 2012
OPEN-FILE REPORT: INTERNATIONAL FALLS DRILL CORE DESCRIPTIONS AND CHEMISTRY, KOOCHICHING COUNTY, MINNESOTA, PROJECT 378. 

Project Leader: Barry Frey
1525 Third Avenue East
Hibbing, Minnesota 55746
tel. (218) 231-8450
barry.frey@state.mn.us

Project Number: 378

This data release consists of the final report for Project 378 and related digital files. The Project 378 drill cores are located within an accessible Archean greenstone terrane near International Falls, Minnesota. The Quetico fault system is prominent in this area. Besides low-grade gold mineralization, the chemical data and logging identified thin sphalerite-bearing intervals and abundant tourmaline (see Figure 1 in P378 Report, for drill core locations).

Data includes laboratory analyses of 231 analyses including 217 drill core samples, duplicates, and standards, by ALS Chemex. The samples were selected from 13 drill cores that had been drilled during the 1980’s, primarily by exploration companies searching for gold and base metals. Drill core and related exploration data are currently available at the Minnesota Department of Natural Resources Drill Core Library in Hibbing, Minnesota.

Sampling was guided by re-logging of the core and also by the use of a hand-held X-Ray Fluorescence (XRF) analyzer instrument. The hand-held XRF targets a circular area of 0.76 cm2 , providing semi-quantitative chemical data at a scale between chemistry lab analyses (over feet) and microprobe (over microns) chemistry. The scale is ideal for smaller features, and is amenable to creating comparative traverses across veins and lithologic contacts; and comparative chemistry, with and without, small features such as sulfide blebs.

Zinc is present in small amounts in some drill cores in this area. It has been reported elsewhere that zinc may interfere with the XRF gold analysis and cause the gold content to be over-estimated. Therefore, we emphasize that these XRF analyses are semi-quantitative and are used as a tool to refine the logging and sample selection for traditional chemical analyses and fire assays.

This data release supercedes previous data releases for Project 378, including September 2010 and March 2011 data releases for this project.

For more information on this project please go to the Project 378 homepage.

October 1, 2012
DIGITAL DATA RELEASED FOR HISTORIC DNR GEOCHEMICAL PROJECT 263

Report 263 Digital Data (.zip, 1.21 mb)

The zip file contains data for samples extracted from twenty seven drill holes described in the Minnesota Department of Natural Resources (MnDNR), Division of Land and Minerals Report “Regional Geochemical Survey of Glacial Drift Drill Samples Over Archean Granite - Greenstone Terrane in the Effie Area, Northern Minnesota - Report 263,” published 1989.   Each folder contains all of the data from the report in a different format.  The data is presented in a Microsoft Access database, Microsoft Excel 97-2003 workbooks, dBase IV files, and ArcGIS shapefiles.  The conversion of the original ASCII digital data to these formats was completed in September of 2012.   The sixteen data sets enumerating drill hole or core sample data contain geospatial information in the form of Universal Transverse Mercator (UTM) East and North coordinates, a “Z” field with the elevation of the drill hole top, and elevation the of top and bottom of the individual samples; all elevations are in feet above sea level.  A new field named “Sample_Num,” concatenating the “Sample” and “Sample_Typ” fields, has been added to tables with a “Sample” field in order to facilitate table joins.  Detailed descriptions of the other data fields can be found in Part I and Part II of the report. The data is designed to be used as a supplement to the report and plates which can be downloaded and viewed at the project 263 homepage listed below. 

For more information on this project please go to the Project 263 homepage.


July 2012

July 3, 2012 - OPEN-FILE REPORT RELEASED: GEOCHEMICAL SOIL SURVEY IN ARCHEAN GRANITE-GREENSTONE TERRANE, INTERNATIONAL FALLS AREA, KOOCHICHING COUNTY, MINNESOTA

Project Leader: Don Elsenheimer

Mineral Potential Project: #385

The DNR conducted a geochemical survey on public lands in the International Falls area, Koochiching County, Minnesota.  A total of 110 shallow soil samples were collected in Autumn, 2010 within grids located on or near an accessible fault-bound greenstone terrane that is part of the Archean Superior Province.  These samples were shipped to ALS Chemex for independent analysis of major and trace element concentrations. ALS Chemex provided DNR with a laboratory report on January 20, 2011. 

The open-file report and data are available for download from the following webpage:

http://www.dnr.state.mn.us/lands_minerals/mpes_projects/project385.html

 

July 2, 2012 - HISTORIC DIGITAL DATA FOR MN DNR REPORT 252 NOW IN GIS FORMAT

In June of 2012 the MN DNR's Division of Lands and Minerals converted DNR Project's 252 (Regional Survey of Buried Glacial Drift Geochemistry Over Archean Terrane in Northern Minnesota) original data files (.asc) into ESRI spatial and tabular datasets. Listed below is a zip file with the original tabular data in .asc file format and the converted GIS data of drill holes, samples, and assay data for Report 252. The two reports (volume 1 and volume 2) for Report 252 should be used regarding the metadata for the original .asc data files as well as the converted spatial data which used the original data files. The data is designed to be used as a supplement to the report and plates. 


Report 252 Digital Data (zip, 9 mb)

 


June 2012

JUNE 27, 2012 - STEARNS COUNTY MAPS AND DATA RELEASED

Aggregate resource mapping has been completed for Stearns County. Two maps and related GIS data are now available for public distribution. The GIS data produced for this project includes: sand and gravel potential and associated table, crushed stone potential and associated table, survey of gravel pits and quarries, field observations, and test hole locations and quality results. You can access this information by:


March 2011

Data Released March 28, 2011:

Project Title: Drill Core Library Bedrock Chemistry Database Pilot Project, Koochiching County

Project Leader: Dennis Martin

Mineral Potential Project: #387

The MnDNR Drill Core Library in Hibbing, MN is a repository with more than 3 million feet of publicly accessible drill core from more than 8,000 drill holes collected over a 100 year time period. Historical assays and geochemical analyses on this archived core are documented in a variety of published and unpublished documents. The majority of these records exist as hard-copies in the MnDNR's public assessment file system, and as scanned image files on the MnDNR web site at http://minarchive.dnr.state.mn.us. While some of these assays and geochemical results have been compiled into electronic databases that are limited in geographic or temporal scope (e.g. Englebert and Hauck, 1991, NRRI/TR-91/12), a geodatabase that includes all available records from all of the archived core is lacking.

The MnDNR is presently conducting a pilot project to evaluate the scope of compiling a comprehensive chemical database for the entire archive of core in the Drill Core Library. This pilot project involves the compilation of assays and geochemical analyses from drill core and outcrop samples from Koochiching County in two formats: 1) a Microsoft Excel 2003 spreadsheet, and 2) a geospatial GIS format, using the NAD83 geographic coordinate system in ESRI shape file format.

Work on the pilot project database for Koochiching County is ahead of schedule; the raw geochemical data from > 4,000 samples of drill core and outcrops has been compiled from public records into a very rough electronic spreadsheet. This includes historical data and the MnDNR's recently released new drill core assays results from the International Falls Area granite-greenstone terrane.

The MnDNR has announced a State Metallic Mineral Lease Sale on April 28, 2011. This sale includes parts of Koochiching County, and areas within the International Falls Area granite-greenstone terrane. The MnDNR believes that the pilot project database for Koochiching County may be helpful for anyone who is considering mineral exploration in this area, even in its rough, pre-release format, and is making it available to interested parties upon request. Please contact Kevin Hanson at kevin.hanson@state.mn.us if you would like access to this rough database at this time.

Data Released March 23, 2011:

Project Title: Regional Survey of Gold in Till, Archean Greenstone Belt, Northeastern Itasca County

Project Leader: Don Elsenheimer

Mineral Potential Project: #379

The DNR is releasing twenty-one (21) new gold grain counts from till and other glacially-derived sediments collected in the Bigfork East (BFE) project area, located within an Archean granite-greenstone terrane in Northeastern Itasca County, Minnesota.  The samples were collected between May and November, 2010 and shipped to Overburden Drilling Management, Ltd (ODM) for independent gold grain counts.  ODM provided DNR with a laboratory report on March 4, 2011.

The till samples were are all located on lands under consideration for inclusion within an upcoming April, 2011 Public Lease Offering by the State of Minnesota.  One of the samples (BFT-52) had a normalized total gold grain count of 227.  This sample was collected from a test pit opened at the location of the BFE sample with the previous high count (BF-08, 144 total gold grains).  BFT-52 was collected from the same till layer, and at only a slightly greater depth (1.5-2.5 feet beneath ground surface, vs. 0.5 to 1.5 feet), thereby confirming the BF-08 result.  

Also released is a data base and GIS-shape file that compiles the results of the 133 gold in till samples collected by DNR in the BFE project area.  Please go to the following address to download the data being released for this project:
www.dnr.state.mn.us/lands_minerals/mpes_projects/project379.html


Data Released March 23, 2011:

Project Title: Koochiching County Archean Greenstone Drill Core Assays

Project Leader: Barry Frey

Mineral Potential Project: #378

This new work consists of laboratory analysis of 166 drill core samples (including standards and duplicates) by ALS Chemex. The samples were selected from 9 drill cores that had been drilled during the 1980’s, primarily by exploration companies searching for gold and base metals. Drill core and related exploration data are currently available at the Minnesota Department of Natural Resources Drill Core Library in Hibbing, Minnesota.

Sampling was guided by re-logging of the core and also by the use of a  hand-held X-Ray Fluorescence (XRF) analyzer instrument. Files contain these new sample assays including standards and duplicates, new core logs, XRF data and core locations.

This data release supercedes the September 2010 data release for this project. Today’s set of chemical analyses is  combined with the data release of September, 2010 to provide a total of 227 samples from 13 drill holes for this Archean greenstone terrane near International Falls ( see map for drill core locations). The author also re-logged the cores and now provides 12 new drill core logs. The drill cores are located within an accessible Archean greenstone terrane near International Falls, Minnesota. The Quetico fault system is prominent in this area. Besides low-grade gold mineralization, the chemical data and logging identified thin sphalerite-bearing intervals and abundant tourmaline. This area is offered in the State's metallic mineral lease sale on April 28, 2011.

Please go to the following address to download the data being released for this project:
www.dnr.state.mn.us/lands_minerals/mpes_projects/project378.html


February, 2011

 Data Released February 01, 2011:

Project Title: Geochemical Survey, International Falls Area

Project Leader: Don Elsenheimer

Mineral Potential Project: #385

The DNR has conducted a geochemical survey on public lands in the International Falls area, Koochiching County, Minnesota.  A total of 110 shallow soil samples were collected in Autumn, 2010 within grids located on or near an accessible fault-bound greenstone terrane that is part of the Archean Superior Province.  These samples were shipped to ALS Chemex for independent analysis of major and trace element concentrations. ALS Chemex provided DNR with a laboratory report on January 20, 2011.

The geochemical sample grids are all located on lands under consideration for inclusion within an upcoming April, 2011 Public Lease Offering by the State of Minnesota.

Please go to the following address to download the data being released:
http://www.dnr.state.mn.us/lands_minerals/mpes_projects/project385.html


October, 2010

 Data Released October 4, 2010:

Project Title: Regional Survey of Gold in Till, Archean Greenstone Belt, Northeastern Itasca County

Project Leader: Don Elsenheimer

Mineral Potential Project: #379

September17, 2010 letter report and microphotographic images from Overburden Drilling Management, Ltd This link leads to an
Exel document. (778 kb)

This letter report provides microphotographic images of unusual gold grains observed within till sample BF-131 collected in the Bigfork East Project Area (see July 1, 2010 Data Release for Map Location and Laboratory Report). This sample had normalized counts of "modified" (18 of 36) and "pristine" (1 of 36) gold grains that were significantly higher than other samples in the project area.

ODM observed two populations of gold grains in this sample. Approximately half of the grains are reshaped, with a torroidal form similar to those observed elsewhere in the project area (July, 2010 Data Release). The grains originally identified as "modified" under binocular microscope are, based on the SEM imagery, now identified by ODM as "pristine," gold grains that have not undergone glacial transport. The surfaces of both the pristine and reshaped grains consist of pure 1000-fineness gold, with patches of thin films of limonite.

The morphology of these pristine grains is complex, and (according to ODM) not normally observed on gold grains in sediments. ODM notes that the shape and purity of these pristine grains are similar to anthropogenic gold precipitated from solution, and suggests that these grains may represent airborne contamination.

This type of pristine gold grain morphology has not been observed in more than 100 other till samples from the project area that have been collected by the MnDNR and analyzed for gold grain counts by ODM. The project area consists of undeveloped forest lands. Therefore, the MnDNR is collecting additional till samples at and near the BF-131 location to help determine the significance of these results.


September, 2010

 Data Released September 1, 2010:

Project Title: Koochiching County International Falls Greenstone Drill Core Assays

Project Leader: Barry Frey

Mineral Potential Project: #378

The following data files are being released in conjunction with Project 378. These analyzed samples came from 5 drill holes in greenstone belt rocks that were historically drilled for gold exploration, and bedrock information. Drill hole samples, and related exploration data, are currently stored at the Minnesota Drill Core Library in Hibbing, Minnesota. The drill holes are located within an accessible Archean greenstone terrane within the State of Minnesota near the Quetico Fault near International Falls, Minnesota.  Sampling was partially guided by the use of the MnDNR’s hand-held X-Ray Fluorescence (XRF) analyzer instrument. This new work consists of laboratory analysis of 61 samples by ALS Chemex. Sample  P3780061 from DDH ND-2 had 0.799 ppm gold from 235 to 240 feet. This anomalous gold is associated with anomalous bismuth and tellurium, a previously unknown relationship.

 

The data files listed below were compiled into this downloadable zip file: p378_datafiles_090110.zip

Read_OF09-10_P378.doc - Word file with data release organization and limitations

P378_OpenFile_Sample_DDH_info.xlsx - Excel file sample drill hole location information

RE10075765.csv - CSV file of received chemistry data

P378_OpenFile_09-10_Chemistry.xls - Excel file with ALS Chemex laboratory results

COA_RE10075765_29190-12155671.pdf - PDF file of received chemistry results

P378_OpenFile_09-10_Chem_Standards.xlsx - Excel file with DNR submitted standards and accepted values

P378_QCDOC_RE10075765.pdf - PDF file of ALS Chemex quality control data

RE10075765QC.csv - CSV file of received chemistry quality control data

P378_RE10075765fin.xlsx - Excel file sample descriptive and location information, received chemistry results, and some basic statistics

p378_exploration_drill_holes.shp - ESRI shapefile for the locations of the five drill cores that were analyzed in Project 378. 

Exploration_drill_holes_metadata.pdf - General metadata for p378_exploration_drill_holes.shp. 

 

For additional information contact:

Project Leader- Mr. Barry Frey
Phone: (218) 231-8450
Email: barry.frey@state.mn.us


July, 2010

 Data Released July 1, 2010:

Project Title: St. Louis County Vermilion Greenstone Drill Core Assays

Project Leader: Barry Frey

Mineral Potential Project: #373

The following data files are being released in conjunction with Project 373 (see OF_01_2009_P373_REPORT, January 2009 Monthly Data Release). These analyzed samples came from 12 drill holes in greenstone belt rocks that were historically drilled for gold, base-metals, and iron formation. Drill hole samples, and related exploration data, are currently stored at the Minnesota Drill Core Library in Hibbing, Minnesota. The drill holes are located within a large, accessible Archean greenstone terrane within the State of Minnesota between Tower and Ely, Minnesota.  Sampling was partially guided by the use of the MnDNR’s hand-held X-Ray Fluorescence (XRF) analyzer instrument. This new work consists of laboratory analysis of 212 samples by ALS Chemex. Files consist of the following:

read_of0710_p373 - Word file with data release organization and limitations This link leads to an Word document. (27 kb)

p373_openfile_0710_sample_info.xls - Excel file sample descriptive and location informationThis link leads to an Exel document. (42 kb)

p373_openfile_0710_chemistry.xls - Excel file with ALS Chemex laboratory results This link leads to an
Exel document. (614 kb)

p373_openfile_0710_chem_standards.xls - Excel file with DNR submitted standards and accepted values This link leads to an
Exel document. (98 kb)

p373_coa_29190_11677484.pdf - PDF file of received chemistry resultsThis is a
PDF file. You will need Adobe Acrobat Reader to download it. (184 kb)

p373_qcdoc_29190_11677490.pdf - PDF file of ALS Chemex quality control dataThis is a
PDF file. You will need Adobe Acrobat Reader to download it. (303 kb)

p373_ddh_list.xls - Excel file with information about drill hole locations (contact project leader with questions) This link leads to an
Exel document. (29 kb)

RE10060081.csv - CSV file of received chemistry data This link leads to an
Exel document. (86 kb)

RE10060081QC.csv - CSV file of received chemistry quality control data This link leads to an
Exel document. (31 kb)

For additional information contact:

Project Leader- Mr. Barry Frey
Phone: (218) 231-8450
Email: barry.frey@state.mn.us

Data Released July 1, 2010:

Project Title: Regional Survey of Gold in Till, Archean Greenstone Belt, Northeastern Itasca County

Project Leader: Don Elsenheimer

Mineral Potential Project: #379

Map of Indicator Mineral sample locations and associated gold grain counts This is a
PDF file. You will need Adobe Acrobat Reader to download it. (11" x 8.5", 1.2 mb)

This map displays the indicator mineral sample locations on an aerial photograph of the Bigfork East Project Area.   The heavy mineral concentrates were examined to search for indicator minerals associated with gold, base metals, or diamonds.  Associated total normalized gold grain counts are also provided; indicator minerals were characterized on six proximal pairs of samples with anomalously high and relatively low gold grain counts.

June 3, 2010 laboratory report from Overburden Drilling Management, Ltd This is a
PDF file. You will need Adobe Acrobat Reader to download it. (57 kb)

This laboratory report from Overburden Drilling Management, Ltd, (ODM) documents indicator mineral concentrations from the 0.25-2.0 mm fraction of twelve (12) nonferromagnetic heavy mineral concentrates (S.G >3.3).  These concentrates were obtained from Rainy Lobe till samples that overlie an Archean greenstone belt in Northeastern Itasca County, Minnesota (see Mn DNR data releases for December 2009 for previously reported gold grain counts). All samples were located within the Bigfork East Project Area. The Mn DNR has a contract with ODM to process the till samples that it collects.

June 22, 2010 letter report and microphotographic images from Overburden Drilling Management, Ltd This is a
PDF file. You will need Adobe Acrobat Reader to download it.(1.2 mb)

This letter report provides microphotographic images of unusual gold grains observed within till samples collected in the Bigfork East Project Area.  ODM first described these gold grains (in a December 9, 2009 letter report) as flat discs with thicker “donut-shaped” rims.

ODM repanned gold grains from three till samples (BFT-41, BF-08 and BF-38) with anomalously high total gold grain counts, and transferred a representative cluster of grains from each sample onto a SEM mount.  As all of the grains reportedly displayed the same morphology, the grains from a single sample (BFT-41) were deemed sufficient for further analysis and photographic imaging.

ODM reports that the gold grains in sample BFT-41 display semi-toroidal forms, and surface fineness (purity) values of 1000, from core to rim.  ODM interprets this to indicate a paleobeach environment that was much older than (and unassociated with) the Pleistocene glaciation event that ultimately incorporated these gold grains into unsorted Rainy Lobe till deposits.

June 24, 2010 final report from Overburden Drilling Management, Ltd This is a
PDF file. You will need Adobe Acrobat Reader to download it. (117 kb)

This laboratory report documents total gold grain counts and non-magnetic heavy mineral concentrate weights in 18 shallow samples and 1 trench till sample from the Bigfork East Project Area.  Mn DNR staff collected the shallow samples in May and June, 2010.  Trench sample BFT-22 was collected in November 2009 (see Mn DNR December 15, 2009 data release for trench location and description).

Data table for BF series samples with locations and normalized gold grain counts This is a
PDF file. You will need Adobe Acrobat Reader to download it. (98 kb)

This data table provides locations as UTM coordinates and normalized gold grain counts (10kg sample weight) for the 19 samples identified in the June 24, 2010 ODM report. 

Sample BF-131 displayed the highest normalized (to 10kg) total gold grain count (36 total gold grains) within this sample suite.  The morphology of gold grains observed in sample BF-131 is significant; more than half of the grains were either “modified” (18 of 36) or “pristine” (1 of 36). In contrast, gold grains in almost all of the other till samples in the project area with anomalously high counts are “reshaped.” 

Map of sample locations and gold grain counts This is a
PDF file. You will need Adobe Acrobat Reader to download it. (11" X 17",1.8 mb)

This map displays sample locations and gold grain counts for the 18 shallow till samples described in the June 24, 2010 ODM report on an aerial photograph of the Bigfork East Project Area, in Northeastern Itasca and Western St. Louis Counties, Minnesota.  The locations and gold grain counts of previous till samples are provided for comparison.   Both total gold grain counts and “modified” gold grain counts are depicted.

For additional information contact:

Don Elsenheimer
Phone: (651) 259-5433
Email: donald.elsenheimer@state.mn.us


April, 2010

Data Released April 20, 2010:

Project Title: Minnesota Lake Sediment Geochemistry Surveys

Project Leader: Dave Dahl

Mineral Potential Project: #376

Listed below and released for download are the final report, appendix, and two zipped files of GIS data. Data are digitized from MnDNR lake sediment survey reports and a set of 1970's vintage lake sediment survey maps that were donated to MnDNR by RGGS Lands and Minerals, Inc. as part of the U. S. Steel Collection. The data represent reconnaissance scale sediment sampling and, in some areas, higher density sampling of reconnaissance anomalies.

Lake Sediment Final Report (Large file size, 10.5 mb) This is a
PDF file. You will need Adobe Acrobat Reader to download it.

Appendix A (228 kb) This is a
PDF file. You will need Adobe Acrobat Reader to download it.

GIS Data Compiled from MnDNR Collection (130 kb .zip)

GIS Data Compiled from U.S. Steel Collection (138 kb .zip)

For further information contact Dave Dahl, DNR Lands and Minerals, Hibbing MN, Phone: 218 231 8445


March, 2010

No data releases


February, 2010

No data releases


January, 2010

No data releases


December, 2009

Data Released December 29, 2009:

Project Title: Regional Survey of Gold in Till, Archean Greenstone Belt, Northeastern Itasca County

Project Leader: Don Elsenheimer

Mineral Potential Project: #379

December 23, 2009 laboratory report from Overburden Drilling Management, Ltd This is a PDF file. You will need Adobe Acrobat Reader to download it.

This laboratory report from Overburden Drilling Management, Ltd, (ODM) documents total gold grain counts and non-magnetic heavy mineral concentrate weights in 48 Rainy Lobe till samples that overlie an Archean greenstone belt in Northeastern Itasca County, Minnesota. These samples were collected by Mn DNR in September and November, 2009 from a 30 square mile area east of an area with previously reported anomalously high gold grain counts (see Mn DNR data releases for May 2009). The Mn DNR has a contract with ODM to process the till samples that it collects.

Data table for BF series samples with locations and normalized gold grain counts This is a PDF file. You will need Adobe Acrobat Reader to download it.

This data table provides locations as UTM coordinates and normalized gold grain counts (10kg sample weight) for the 48 samples identified in the ODM report. Twenty-eight of the 48 samples had normalized total gold grain counts higher than 10, with a high value of 144 gold grains.

Map of BF sample locations, gold grain counts, and areas offered in January 2010 MN DNR Lease Sale This is a PDF file. You will need Adobe Acrobat Reader to download it.

This map displays sample locations and gold grain counts on an aerial photograph of the area, overlain by a grid that identifies areas being offered in a January 12, 2010 Metallic Minerals Lease Sale. See the Mn DNR Mining Unit Book for the official state mineral lease offerings.

December 22, 2009 final laboratory report from Overburden Drilling Management, Ltd This is a PDF file. You will need Adobe Acrobat Reader to download it.

This laboratory report documents total gold grain counts and non-magnetic heavy mineral concentrate weights in 8 till samples from Northeastern Itasca and Western St. Louis Counties, Minnesota. This final report adds new heavy mineral concentrate data to the gold grain counts previously reported in a 9 December ODM laboratory report (see Mn DNR data release on December 15, 2009).

For additional information contact:

Don Elsenheimer
Phone: (651) 259-5433
Email: donald.elsenheimer@state.mn.us

Data Released December 15, 2009:

Project Title: Regional Survey of Gold in Till, Archean Greenstone Belt, Northeastern Itasca County

Project Leader: Don Elsenheimer

Mineral Potential Project: #379

December 9, 2009 laboratory report from Overburden Drilling Management, Ltd This is a PDF file. You will need Adobe Acrobat Reader to download it.

This report from Overburden Drilling Management, Ltd, documents total gold grain counts and non-magnetic heavy mineral concentrate weights in 8 Rainy Lobe till samples that overlie an Archean greenstone belt, located in Northeastern Itasca and Western St. Louis Counties, Minnesota. These samples were collected on October 2, 2009 by Mn DNR from trenches opened in the four locations with the highest gold grain counts in the first phase of the project (see May 2009 data releases).

December 9, 2009 letter report from Overburden Drilling Management, Ltd This is a PDF file. You will need Adobe Acrobat Reader to download it.

This report summarizes some of the more unusual aspects of these sample results. ODM notes that “the gold content is very high”, and states that this implies proximity to a gold source. That said, nearly all of the gold grains in these samples are reshaped, and the till matrix has atypically high silt and clay fractions. ODM suggests that the gold grains may have initially been concentrated in a lacustrine environment, then remobilized by a re-advancing ice sheet, and redeposited as part of a silt and clay-rich, clast-poor till.

Bigfork trenching powerpoint presentation This is a PDF file. You will need Adobe Acrobat Reader to download it.

This presentation describes the goals and of this follow-up trenching project, and documents, in photographic images and schematics, trench stratigraphy. The 8 new trench samples taken by Mn DNR from these 4 locations confirm the high anomalous total gold grain counts obtained in the first phase of the project.  

The four anomalous gold in till locations are all located in areas of State-owned mineral rights that are being offered in the January 12, 2010 Metallic Minerals Lease Sale

For additional information contact:

Don Elsenheimer
Phone: (651) 259-5433
Email: donald.elsenheimer@state.mn.us


November, 2009

No data releases


October, 2009

No data releases


September, 2009

The following data is released:

Mineral Potential Project: #376

Project Title: Compilation of Lake Sediment and Stream Sediment Geochemistry Data

Project Leader: D. Dahl

The following compiled data is released: Two ArcGIS shapefiles and sixteen preliminary figures depicting lake sediment and steam sediment sample sites within a 10,000 square mile project area in east-central and northeastern Minnesota. Data are digitized from a set of 1970's vintage lake sediment survey maps that were recently donated to MnDNR by RGGS Lands and Minerals, Inc. as part of the U. S. Steel Collection. The data set represents reconnaissance scale sediment sampling locations and, in some areas, higher density sampling of reconnaissance anomalies. Sample density for the reconnaissance scale work averages one sample per 8.34 square kilometers (one sample per 3.22 square miles).

The first data file in this release consists of a shapefile containing 3,540 sample points carrying attributes for Co, Ni, Cu, Zn, Pb, Ag, As, U3O8, Total Heavy Metals, Sample ID, Sample Type, and Map Tile. The second file is a shapefile containing polygon outlines of the twelve map tiles that make up the map set. The data set reflects locations and values as found on a set of 108 large format map prints. DNR makes no warranty or claim for the validity of the data, other than that it was compiled from a donated collection.

Also included in this release are sixteen preliminary Figures illustrating the project area outline and data points plotted as percentile values for the various element attributes. One of the preliminary Figures includes outlines of two small airborne Mag-EM surveys that are present in the donated RGGS US Steel Collection, which were flown as follow up to the sediment sampling.

Detailed description of the data set and compilation methods is in preparation.

For further information contact Dave Dahl, DNR Lands and Minerals, Hibbing MN, Phone:218 231 8445


August, 2009

No data releases


July, 2009

No data releases


June, 2009

The following data is released: Project 372, Vermilion District Gold Project leader Don Elsenheimer A May 21, 2009 laboratory report MDNR May 2009 ODM Results.xls, from Overburden Drilling Management, Ltd, which documents total gold grain counts and non-magnetic heavy mineral concentrate weights in 48 till samples from the Vermilion District, St. Louis County, Minnesota, and 37 till samples from the Big Fork Quadrangle, located in Western St. Louis and Eastern Itasca Counties, Minnesota. Two spreadsheets, bigfork_sample_description.xls, and 2008_vermilion_samples.xls, provide supplemental information for each sample set (i.e. collection date, UTM coordinates, till descriptions). The Vermilion District samples were collected in June-July 2008, while the Big Fork samples were collected in October-November 2008. Both sets were shipped to the laboratory in May 2009, and analyzed that same month. All sample were collected at locations with State-held mineral rights. Anomalous total gold grain counts and pristine gold grain counts were obtained from Vermilion District samples both proximal to known gold occurrences and in new areas with no historical reports of gold occurrences in the public record. These results are similar to those obtained in a 2005 MDNR till sampling program within the nearby Mud Creek area of the Vermilion District. The map Vermilion_Gold_in_Till.PDF plots sample locations and gold grain counts for both the 2005 and 2008 Vermilion District data sets, relative to areas with active State Mineral Leases, and the Vermilion District areas included within a 2009 State Mineral Lease Sale Offering. The Big Fork samples were collected in the southeastern portion the 30 x 60 Big Fork Quadrangle, within a relatively unexplored portion of a granite-greenstone terrane that lacks previously-identified gold prospects. Anomalous total gold grain counts were obtained both in samples of thin till overlying shallow Archean greenstone bedrock exposures, and in areas proximal to major geologic structural features. The map Bigfork_Gold_in_Till.PDF displays sample locations and plots gold grain counts, relative to major structural features and areas of State-held mineral rights. For additional information, contact Don Elsenheimer at 651 259-5433

e-mail:donald.elsenheimer@state.mn.us


May, 2009

A power point of MN DNRs 2009 poster at PDAC in Toronto

Contact Barry Frey for further information.


April, 2009

No data releases


March, 2009

No data releases


February, 2009

No data releases


January, 2009

The following materials are open filed:

Gold potential in the Vermilion District DNR has compiled historic mineral exploration data and obtained new results from gold prospects in St. Louis County, MN.

The information is contained in the MS-WORD document Drill Core Evaluation of Vermilion Greenstone Belt Gold Mineralization, Northeastern Minnesota

This file is available in PDF format as: P373OpenFileRpt.pdf This is a PDF file. You will need Adobe Acrobat Reader to download it.

The data from which this report was generated is available via FTP. Contact Barry Frey for further information.


December, 2008

The following data from project 373, Barry Frey, project leader,is released:

8 JPG photographs of a bluish mineral, glaucophane or crossite, from a Foss Lake Prospect drill core, "6314-36-1".

For further information contact Barry Frey, phone 218 231 8450 DNR Lands and Minerals Div., Hibbing, MN


November, 2008

DNR Lands and Minerals geologists have compiled exploration data and obtained new results from gold prospects within the Vermilion District, St. Louis Co. MN. These are greenstone terrane prospects which will be offered for lease in the January, 2009 sale.

Please see Lease Sale Information

The following Power Point presentations are available:

Project 372 Vermilion District Gold Project leader Don Elsenheimer

Power Point file State Metallic Minerals Lease Sale, Minnesota's Vermilion Gold District. This reviews compiled mineral exploration data and identifies gold prospects within the Vermilion District.

For further information contact Don Elsenheimer 651 259 5433.

Project 373:

Project 373, Drill Core Evaluation Project This is a PDF file. You will need Adobe Acrobat Reader to download it. leader Barry Frey.

Vermilion Greenstone Gold: New Results from Drill Cores This is a PDF file. You will need Adobe Acrobat Reader to download it. This characterizes previously unrecognized gold-bearing intervals within archived drill cores from the Vermilion District. New data includes semi-quantitative hand-held XRF data, gold mineral associations, and proposed mineralization models.

For further information contact Barry Frey 218 231 8450


October, 2008

No data releases


September, 2008

No data releases


August, 2008

No data releases


July, 2008

No data releases


June, 2008

The following data is released:

Project 373, Drill Core Evaluation Project leader Barry Frey

The remaining chemistry for the first 65 samples from the Vermilion Greenstone Belt. The earlier results are included for convenience. File names are:

P373Juneopenfile.doc P373ALSchem1A.xls P373ALSchem1B.xls P373CHEMsamps1.xls P373Chemsamp1locations.xls

For further information contact Barry Frey 218 231 8450


May, 2008

The following data is released:

Project 373, Drill Core Evaluation, Barry Frey, project leader

Sampling information, locations and results of re-analysis of selected drill cores from the Vermilion Greenstone Belt.

New data consists of drill logs and XRF chemistry data in three EXCEL files and a WORD file.

For further information contact Barry Frey, 218/231 8450,

e-mail:barry.frey@state.mn.us

Project 370, Portfolio project, Don Elsenheimer, project leader.

A laboratory report in EXCEL format documenting geochemical analyses of heavy mineral concentrates derived from glacial till samples from the Virginia Horn Greenstone Terrain, St. Louis Co. MN. Analysis performed by Chemex, Inc.

For further information contact Don Elsenheimer 651/259 5433

e-mail:donald.elsenheimer@state.mn.us


April, 2008

The following data is released:

Project 373, Drill Core Evaluation, Barry Frey, project leader

Sampling information, locations and results of re-analysis of selected drill cores from the Vermilion Greenstone Belt.


March, 2008

No data releases


February, 2008

The following data is released:

Project 370, Portfolio Project Open-File Report Project Leader: Don Elsenheimer The following data is released: A laboratory report Virginia Horn Gold Grain Counts.xls, from Overburden Drilling Management, Ltd, which documents total gold grain counts and non-magnetic heavy mineral concentrate weights in 29 till samples from the Virginia Horn Greenstone Terrain, St. Louis County, Minnesota. Anomalous total gold grain counts and pristine gold grain counts were obtained from samples both proximal to and distant from known gold occurrences. Samples were collected in May, 2007, and shipped to the laboratory in June, 2007. The results were reported to the MDNR on January 20, 2008. A spreadsheet Till Sampling Notes.xls, which provides supplemental information for each sample location (i.e. collection date, UTM coordinates, till descriptions). A map VH Till Sampling Location.pdf, which displays total gold grain counts for each sample location, relative to the quartz-feldspar porphyry unit that has been associated with almost all of the known gold occurrences in the area. Joe Hudak made significant contributions to this project. For further information, contact Don Elsenheimer, phone 651/259-5433; e-mail:donald.elsenheimer@state.mn.us


January, 2008

No data releases.


December, 2007

No data releases.


November, 2007

No data releases.


October, 2007

Project 368, Drill Core Evaluation, Virginia Horn Area. Barry Frey, Project leader.

The following data is released:

Microprobe, X-RAY Fluorescence, and alteration chemistry work on select samples within the Virginia Horn greenstone terrane.

The following PDF provides contextual information about the Virginia Horn area:

370report.pdf

Four PDF files describing the work and available files may be downloaded via the following links:

This document contains photomicrographs of selected minerals.

images_070918.pdf

This document lists the available files not included on this site; please contact the listed personnel for copies.

ofoct07.pdf

This document is a power point presentation (in PDF format) describing the work and mineralization of the Virginia Horn. For the notes accompanying the slides move your cursor to the icon in the upper left of the slide.

virginia_horn_gold

This document presents the X-Ray Fluorescence, microprobe and alteration chemistry data. Move your cursor to the icon in the upper left of the slide for notes.

vhxrf_minprobe_data.pdf

The following links display maps (PDF format) portraying data from the Virginia Horn gold project.

vh_gold_map1.pdf vh_gold_map2.pdf vh_gold_map3.pdf

vh_gold_map4.pdf vh_gold_map5.pdf vh_gold_map6.pdf

For a discussion of the data, the project, or for further information contact:

Barry Frey, phone 218/231 8450;

e-mail:barry.frey@state.mn.us or

Don Elsenheimer also contributed to this project: phone 651/259-5433;

e-mail:donald.elsenheimer@state.mn.us


September, 2007

No data releases.


August, 2007

Project 370, Portfolio Project Open-File August 3, 2007

Project Leader: Don Elsenheimer

The following data is released:

A report, Gold Mineralization in the Virginia Horn Greenstone Terrain, St. Louis County, Minnesota which compiles historic mineral lease information, as well as historic and new, geologic, geochemical, and fluid inclusion data for the area.

A large number of GIS shape-files have been compiled and created as part of this project. These files are available for release. Alternatively, based on public requests, MnDNR staff can provide specific maps and/or data plots based on these shape-files.

Barry Frey and Joe Hudak made significant contributions to this project.

For further information, contact Don Elsenheimer, phone 651/259-5433;

e-mail:donald.elsenheimer@state.mn.us

or Barry Frey, phone 218/262 7326;

e-mail:barry.frey@state.mn.us


July 25, 2007

The Minnesota Department of Natural Resources, Division of Lands and Minerals has received a donation of mineral exploration data from RGGS Lands and Minerals Ltd of Houston, Texas. The materials are composed of historical U. S. Steel exploration maps and data that were previously stored at the Minntac Mine facility in Mountain Iron, Minnesota.

Exploration areas covered include portions of the following terranes: the Mesabi Iron Range (primarily iron ore drilling linens), the Duluth Complex area (airborne and ground geophysics, geology and geochemistry), Archean and Proterozoic terrane in Minnesota (airborne and ground geophysics, geology and geochemistry related to base metal, manganese and gold exploration), and various Minnesota reconnaissance geochemical survey data.

A preliminary inventory of the donation has been completed and consists of three (3) Excel spreadsheets.

Clients should plan on spending extra time and care in order to preserve the structure and organization of these uncatalogued materials. The materials are presently housed in the containers as shipped.

Contact Information:
Lands and Minerals Division
Minnesota Department of Natural Resources
1525 Third Avenue East
Hibbing, Minnesota 55746

Attn: David Dahl (218) 231-8445
e-mail:dave-hibbing.dahl@state.mn.us

or Richard Ruhanen (218) 231-8469
e-mail:rick.ruhanen@state.mn.us


July, 2007

DNR Lands and Minerals Project 368, Barry Frey, Project leader. The following data is released:

Chemistry and mineralogy from 635 samples from three areas: The Rice River District of the Cuyuna Range, the Virginia Horn, and greenstones from Itasca and Beltrami counties.

In addition, 279 microprobe analyses from 11 polished sections are available from the Virginia Horn, St. Louis Co., area as well as selected microprobe images and logging data.

For further information, contact Barry Frey, phone 218/262 7326;

e-mail:barry.frey@state.mn.us


June, 2007

DNR Lands and Minerals Project 368, Barry Frey, Project leader. The following data is released:

Two sets of chemical results from drill core and cuttings analysis by ALS Chemex of Sparks, NV, and

Preliminary study of fluid inclusions associated with the known gold mineralization in the Virginia Horn area by Dr. Andrew Conly, Lakehead University, Thunder Bay, Ontario, Canada.


May, 2007

No data releases.


April, 2007

No data releases.


March, 2007

No data releases.


February, 2007

No data releases.


January, 2007

No data releases.


December, 2006

The following data is released:

Project 368, "Drill Core Analysis Project", Barry Frey, project leader.

A new occurrence of visible gold has been found in drill hole DML-3, Virginia Horn area. This hole is located with the SE-SE-SW of S. 28, T58N R17W, and is about 8,000 feet from the previously known gold occurrence in the area.

The gold occurs in a ribbon-textured, quartz-calcite vein with minor pyrite from 207.5 - 209 ft. The wall rock is a volcanogenic greywacke.

For further information, contact Barry Frey, phone 218/262 7326;

e-mail:barry.frey@state.mn.us


November, 2006

No data releases.


October, 2006

No data releases.


September, 2006

No data releases.


August, 2006

No data releases.


July, 2006

The following data is released:

Mineral Potential Project 370 "Reconnaissance Gold Grain Counts in Glacial Till near Nashwauk, MN," Project leader Dave Dahl

Results from 15 samples of B horizon till processed by Overburden Drilling Management of Nepean, ON

Normalized gold grain counts range from 1.5 to 20 gold grains per 10 kg table feed.

The processing report from Overburden Drilling Management as well as a sample locations map are available.

Mineral Potential Project 368 "Mineral Potential Investigation of Existing Drill Cores," Project leader Barry Frey

Logs and analysis from drill cores in the Rice River District, Aitkin County, are released. Data includes anomalous copper values.


June, 2006

No data releases.


May, 2006

No data releases.


April, 2006

No data releases.


March, 2006

No data releases.


February, 2006

No data releases.


January, 2006

The Minnesota Geological Survey (MGS) has released data from the second phase of a study entitled "Geology, Geochemistry and PGE Potential of Mafic-Ultramafic Intrusions in Minnesota, Excluding the Duluth Complex."

The data include 850 geochemical analyses from 20 intrusions that were selected on the basis of Phase I of the study, which was open filed-filed in 2003.

A final report will be published in March, 2006, containing data from 150 intrusions, including detailed petrologic, geochemical, and PGE assessment of the 20 selected intrusions.

Both phases of the study were funded by the Minerals Diversification Program of the Minnesota Legislature on recommendations of the Minerals Coordinating Committee.

The Open-file report is available from the MGS website: http://conservancy.umn.edu/handle/11299/123364

For further information contact Mark Jirsa jirsa001@umn.edu, phone 612/627 4780 ext. 208, or Jim Miller mille066@umn.edu, phone 218/720 4355.


December, 2005

No data releases.


November, 2005

No data releases.


October, 2005

No data releases.


September, 2005

No data releases.


August, 2005

No data releases.


July, 2005

The following materials are being open filed:

Project 262, Project Leader Dennis Martin

Follow up mineralogical analysis of 20 concentrate samples from Project 262 (1989) for indicator minerals relating to nickel-copper-platinum group elements from nearby mafic intrusions. The samples were processed by Overburden Drilling Management, Nepean, Ontario; no obvious significant results are noted.

The data are contained in two Microsoft Word files and a Microsoft Excel spreadsheet.


June, 2005

No data releases.


May, 2005

No data releases.


April, 2005

Project Title: Glacial Till Sampling in the Vermilion Greenstone Belt, Northeastern Minnesota

Project Leader: Dave Dahl

Mineral Potential Project: #365

The following materials are being open filed and available for download below:

"Results of Glacial Till Sampling in the Vermilion Greenstone Belt, Northeastern Minnesota"

Final report, GIS data, tables, figures, and appendices (8.78 mb zip)

This report and data provides details on gold grain counts, silt/clay chemistry, heavy mineral concentrate chemistry and pebble counts for 32 glacial till samples collected east of Lake Vermilion, Minnesota.

Contact: David Dahl (218) 231-8445
e-mail: dave.dahl@state.mn.us


March, 2005

No data releases.


February, 2005

No data releases.


January, 2005

No data releases.


December, 2004

No data releases.


November, 2004

The following materials are being open filed:

Project 298-3, "Dimension Stone Inventory of Northern Minnesota", Project Leader Matt Oberhelman

A new dimension stone prospect site has been identified in St Louis County: Township 65N Range 15W, Sec. 9, SE-SW. Dimension stone project site S-290 is grayish-pink granite exhibiting good quarry block potential.


October, 2004

The following materials are being open filed:

Project 365, "Orientation Survey of Glacial Till Materials in the Vermilion Greenstone Belt, Northeastern Minnesota", Project Leader David Dahl

1. Geochemistry (INAA) results, including gold, for -63um (silt/clay) fractions of 32 glacial till samples.

2. Geochemistry (INAA) results, including gold, for -0.25mm nonmagnetic heavy mineral concentrates of 32 glacial till samples.

3. Laboratory hardcopy of geochemistry results for -63um (silt/clay) fractions of 32 glacial till samples (hardcopy of 9/1/2004 release).


September, 2004

The following materials are being open filed:

Project 365, "Orientation Survey of Glacial Till Materials in the Vermilion Greenstone Belt, Northeastern Minnesota", Project Leader David Dahl

1) Geochemistry results for -63um (Silt/Clay) fractions of 32 glacial till samples.

2) Geochemical results for 12 rock grab samples and rock float samples from the Mud Creek area in the Vermilion Greenstone Belt.

3) Geochemical results and sample locations for 24 rock float samples from the Purvis Lake Road area in the Vermilion Greenstone Belt.


August, 2004

The following materials are being open filed:

Project 365, "Orientation Survey of Glacial Till Materials in the Vermilion Greenstone Belt, Northeastern Minnesota", Project Leader David Dahl

1) Gold Grain Report from Overburden Drilling Management, Ltd. (ODM) for 32 glacial till samples; 8 pages

2) List of laboratory abbreviations used by ODM in Gold Grain Report; 1 page

3) Table of sample locations, Munsell colors, UTM coordinates, and normalized grain counts

4) Regional map of Minnesota/Ontario greenstone belt areas, size 8.5" x 11"

5) Sample locations map on shaded-relief topography backdrop, size 8.5" x 11"

6) Sample locations, gold grains, shear zones map on 2003 color aerial photography backdrop, size 11" x 17"

7) Hardcopy prints of 4 JPEG images showing sample locations against Peterson & Patelke (2004) geology map


July, 2004

No data releases.


June, 2004

No data releases.


May, 2004

No data releases.


April, 2004

No data releases.


March, 2004

No data releases.


February 2004

No data releases.


January 2004

No data releases.


December, 2003

Aggregate Resources and Surficial Geology, Renville County, MN. by Heather E. Arends.

Two plates, in Adobe Acrobat format, are available for download from the Aggregate Maps page. These drafts will be available for review and comment until December 22, 2003. After this date a final set of maps and associated GIS data will be published and available on CD-ROM and the internet.

For paper copies, contact Heather E. Arends, Aggregate Resources Geologist.
tel: 651-259-5376 fax: 651-296 5939
email:heather.arends@state.mn.us


November 2003

No data releases.


October 2003

No data releases.


September 2003

No data releases.


August 2003

No data releases.


July 2003

Aggregate Resources and Surficial Geology, Le Sueur County MN.

Two plates, in Adobe Acrobat format, are available for download from the Aggregate Maps page. These are drafts available for a 30 day review and comment period. Associated GIS data will be available after the comment period (Aug.15).

For paper copies, contact Heather E. Arends, Aggregate Resources Geologist.
tel: 651-259-5376 fax: 651-296 5939
e-mail:heather.arends@state.mn.us


June 2003

No data releases.


May 2003

No data releases.


April 2003

The following data set is released:

Project 359, Conversion of Statewide Aeromagnetic Digital Files to ARCVIEW GIS Format Project Leader David Dahl

Sixty-two data files from Minnesota's statewide aeromagnetic data set from the survey flown (1979 - 1989) by the Minnesota Geological Survey are available for download through the MN DNR GIS Data Deli at http://deli.dnr.state.mn.us.These data were originally available through NOAA's National Geophysical Data Center at Boulder,CO.

The data, in ARCVIEW (ver.3.2) point shapefiles, comprise approximately 11 million records. Coordinates are UTM Zone 15 projection, NAD 83 datum, X and Y ordinates in meters. Attribute data includes fiducials, altimeter readings, diurnal corrections, total field and residual magnetic values, and flight line numbers.

For further information contact David Dahl (218) 231-8445
e-mail:dave-hibbing.dahl@state.mn.us


March 2003

The following report is released:

Report 347, Analysis of Drilling and Sampling Techniques Used to Obtain Representative and Accurate Samples in Coarse Sand and Gravel Deposits, Project Leader Jon Ellingson.

Multiple samples were collected utilizing several different sampling techniques to determine the best methodologies for obtaining representative samples from coarse sand and gravel deposits. The effects of each technique on the type of material sampled (particle size distribution of the material)is compared.


February 2003

The following report is released:

Report 358, Inventory of Publicly Owned Stockpiles and Natural Aggregate Resources at the Former LTV Mine and Vicinity Project Leader Glenn D. Melchert.

An inventory of all mining stockpiles with any public ownership for the former LTV mine at Hoyt Lakes, MN and vicinity. Covers all of Township 59N Range 14 and 15W and portions of Townships 58N and 60N, Range 14 and 15W. Includes qualitative estimates for crushed rock aggregate, rip-rap, and decorative stone. Surrounding public lands were evaluated for indications of gravel and concentrations of glacial boulders.

Products include a report with appendices, photo supplement, and two plates. A CD with these items as well as ARCVIEW shapefiles, digital photos, and an ACCESS database is available.


January 2003

No data releases.


December 2002

No data releases.


November 2002

The following materials are released:

Report 353, Description of the Metamorphosed Virginia Formation at the Peter Mitchell Mine, Babbitt, Minnesota

by Richard W. Ruhanen

Descriptions of the Virginia Formation from 14 drill cores from Sec. 16, T60N R12W, in the northeast portion of the mine.

Report (.pdf, 4 mb) and Figures (.pdf, 1 mb). Excel Data (.zip, 1 MB)


October 2002

Report 357, Aggregate Resources of Dodge County, Minnesota, 2002, by Heather E. Arends.

This draft will be available for review and comment until November 5, 2002. After this date a final set of maps will be published and available on CD-ROM and the internet.

For additional information, contact Heather E. Arends, Aggregate Resources Geologist.
tel: 651-259-5376
email:heather.arends@state.mn.us


September 2002

No data releases.


August 2002

The following materials are released:

Report 336-5, Surficial Geology of Interstate State Park, Project Leader Matt Oberhelman.

Includes a 1:12000 scale geologic map.

Drill Core Library Index. Compiled by A. Dzuck and R. W. Ruhanen.

Catalogue of drill cores held at the Division of Lands and Minerals Core Library at Hibbing, MN. Includes such information as location, lessee, footages, and so on.


July 2002

No data releases.


May - June 2002

Aggregate Resource Mapping of Benton County, Minnesota. (Project leader Jonathan B. Ellingson, Report 356).

A draft version of this report was released on May 29, 2002, and was available for public review and comment until June 29, 2002. After that, a final set of plates and data were released as Report 356 and is now available through the Aggregate Mapping Program page.

Products include: 4 plates (in identical digital and paper versions), and a CD with maps, data, and metadata.


April 2002

Compilation of Mineral Resources Digital Information for the Minnesota River Valley Corridor (Dennis Martin, Compiler, DNR Report 340).

Mineral resource information was compiled into digital format for the Minnesota River Valley Corridor for local governments that have the authority for planning and zoning. Mineral commodities included in this report are granite, quartzite, limestone, silica sand, industrial clay, and sand and gravel. Contributors to the report include staff from the Natural Resources Research Institute, Minnesota Geological Survey, and Department of Natural Resources. The brief text and 4 plates contain information such as the existing pit and quarry locations, available outcrop locations, and mineral potential maps for the above commodities. The digital information will be available on a CD-ROM at a later date.


December 2001 - March 2002

No data releases.


November 2001

Aggregate Resource Evaluation of a School-Trust Parcel Southeast of Big Fork in Itasca County, MN (Project Leader Glenn Melchert, Project 334-13).

This report summarizes the extent, quantity, and quality of a gravel resource delineated by auger drilling on a parcel of state land (Section 36, T60N, R25W) managed by DNR Forestry in Effie.

Aggregate Resource Evaluation of the Olson and Cranberry Pits in the Mille Lacs Wildlife Management Area near Onamia, MN (Project Leader Glenn Melchert, Project 334-14).

This report summarizes the extent, quantity, and quality of two gravel resources delineated by auger drilling on state land (Section 7, T41N, R25W and Section 34, T41N, R26W) managed by DNR Wildlife.


September - October 2001

No data releases.


August 2001

The following material was released on August 10, 2001.

Stockpile Ownership, Composition, and Use for Two Study Areas Located near Virginia and Calumet, Minnesota (Project 350, part of Mesabi Iron Range Water and Mineral Resource Planning). Contacts: Heather Arends, (651) 259-5376, and Vicki Hubred, (218) 231-8454.

This is a pilot project conducted in two study areas: 6,000 acres near Calumet and 3,000 acres near Virginia, Minnesota. The project researched the ownership and composition of stockpiles and assessed the possible uses of the material. Stockpile ownership and composition was captured in a database.

The report, four plates, and metadata are available for download here. The CD can be requested from the contacts above. It contains README files, the report, plates in PDF and PS formats, metadata, and the database.

Download report.
Stockpile Ownership, Composition, and Use for Two Study Areas Located near Virginia and Calumet, Minnesota (79 pages, PDF/2.4 mb, filename Report 350.pdf)

Download README and metadata files, zipped.
(125 kb, filename proj350_metadata.zip).

Download accompanying color plates. Please note: Best results in viewing these plates will be obtained by saving the files to a location of your choice and opening with Adobe Acrobat. Some plate information may not display as a result of opening with Acrobat directly from a web browser.

Plate 1: Ownership, Calumet Study Area: a Portion of Township 56 North, Range 23 West and Township 56 North, Range 24 West Itasca County, Minnesota 2001 (48 x 36 inches, full size. PDF/500 kb, filename proj350_plate1.pdf)

Plate 2:Ownership, Calumet Study Area: a Portion of Township 56 North, Range 23 West and Township 56 North, Range 24 West Itasca County, Minnesota 2001 (48 x 36 inches, full size. PDF/250 kb, filename proj350_plate2.pdf)

Plate 3: Material Type, Vegetation, and Transportation Calumet Study Area, a Portion of Township 56 North, Range 23 West and Township 56 North, Range 24 West Itasca County, Minnesota 2001 (48 x 36 inches, full size. PDF/8.8 mb, filename proj350_plate3.pdf)

Plate 4: Material Type, Vegetation, and Transportation Virginia Study Area: A Portion of Township 58 North, Range 17 West St. Louis County, Minnesota 2001 (48 x 36 inches, full size. PDF/5.5 mb, filename proj350_plate4.pdf)

The following material was released on August 1, 2001.

Public Access to Minerals Data: 12,000 unpublished mineral exploration documents can now be accessed at http://minarchive.dnr.state.mn.us. Documents are primarily from non-ferrous exploration since the mid-1960's. The site provides map-based and attribute-based access to the contents of the mineral exploration archives at MnDNR's Hibbing office, and also includes outlines of data sources and reports from the Minnesota Geological Survey and the University of Minnesota - Natural Resources Research Institute. For more information check the web site or contact David Dahl, Rick Ruhanen, or Dale Cartwright at 218/262-6767.

Chisago County Aggregate Resources (Gary Meyer, Minnesota Geological Survey, Project 345) Contact: Dennis Martin, 651/259-5405.

Project (map scale 1:50,000) was contracted to the Minnesota Geological Survey. Products include: 2 plates and a CD with maps, GIS data, and metadata. Maps and data will be made available digitally through the Aggregate Mapping Program page.

Mesabi Iron Range Water and Mineral Resource Planning, Stockpile Ownership, Composition and Use (Project Leader Heather Arends, Project 350).

A CD containing PDF format chemical assay results of 52 grab samples, and supporting documentation, that were taken of stockpiles in two study areas. One site is located east of the city of Virginia in St. Louis County comprising approximately 3,000 acres in portions of Township 58 North, Range 17 West. The second site is located on the west end of the Mesabi Iron Range in the vicinity of the cities of Calumet and Marble in Itasca County comprising approximately 6,000 acres.

PDF format chemical assay results are available here. As part of this zip file, assay results are also provided in Comma Delineated Text, DBF IV, Excel 97, INF, and MDX. Also included are README file, maps, and metadata files. (300 kb, filename project350.zip). An additional file, project350_study_area_ortho.pdf, containing digital orthophotographs of the two study areas is included separately here, due to its large size (PDF, 4.2 mb).


June - July 2001

No data releases.


May 2001

The following material was released on May 1, 2001.

Aggregate Resources and Quaternary Geology of Isanti County
(Digital Open-File Report Text by J.D. Lehr, 1996, Project 304).
Contact Person: Dennis Martin, (651) 259-5405

One of the goals of the Lands and Minerals Division is to produce our resource maps in digital format. Recently, the 1992 Isanti County Aggregate Resources map was added to the DNR website, and is available from the Aggregate Mapping program page. The digital version of the accompanying report text is now available. No previously published report was issued. This text will now be included in open-file indexes of digital information regarding county aggregate resource maps.

The aggregate resource map format has changed since this project; supportive text is now included on the map plate.


January - April 2001

No data releases.


December 2000

The following material was released on December 14, 2000: Aggregate Resource Mapping of Nicollet County, Minnesota, Project Leader Jonathan B. Ellingson.

Products include: 4 plates and a CD with maps, data, and metadata.

These plates were available for public review and comment until January 31, 2001. After that, a final set of plates was released and is now available through the Aggregate Mapping Program page.


November 2000

No data releases.


October 2000

Site-specific Aggregate Resource Evaluation, Warroad Area, Project leader Glenn Melchert. This report summarizes results of Giddings probe work at two existing gravel pits (Summer Pit and Ditch 10 Pit) managed by DNR Forestry in Warroad. (Project 334-9).


July-September 2000

No data releases.


June 2000

Minnesota Aeromagnetic Data converted for GIS use, Project Leader David Dahl, MnDNR Lands and Minerals. (Misc/ No Project Number).

Four files of flight line data, covering the Duluth Complex, MN, from the Minnesota Geological Survey/National Geophysical Data center CD-ROM set of Minnesota Aeromagnetic Data, converted to Arcview GIS shapefile format. The GIS data files also contain a dbase IV (.dbf) file of the flightline data for non GIS users.

Access to the four files is available at MnDNR's internet site for free public data: http://deli.dnr.state.mn.us

In addition, several TIFF images of the aeromagnetic data are available for download and will be posted at the data deli site. Feedback from users will determine whether the flight line data for the rest of the state will be posted for free download.

All of the MnDNR Data Deli products are cast in UTM zone 15 projection, NAD83 datum, using map units of meters.

For more information, please contact Project Leader David Dahl at (218) 231-8445
e-mail:dave-hibbing.dahl@state.mn.us


May 2000

Aggregate Resource Evaluation for a portion of Felton Prairie in Clay County, Minnesota, by Heather Arends (Project 334-11). This project summarizes the results of a 27 hole rotosonic drilling program conducted over approximately 700 acres on a portion of Felton Prairie in December 1999. The report was prepared for the Felton Prairie Stewardship Committee by the DNR Division of Lands & Minerals.

Download report:
Aggregate Resource Evaluation for a portion of Felton Prairie in Clay County, Minnesota (PDF/2.4 mb)

Download accompanying color plates. Please note: Best results in viewing these plates will be obtained by saving the files to a location of your choice and opening with Adobe Acrobat. Some plate information may not display as a result of opening with Acrobat directly from a web browser.

Plate 1, Results of Rotosonic Drilling and Geophysics (PDF/2.8 mb)

Plate 2, Geologic Interpretations (PDF/2.5mb)

Report and Plates 1 & 2 zipped together (zipped PDF/3.8 mb)

A hard copy of the report can be obtained through the DNR Division of Lands & Minerals or by contacting Clay County at the following address:

Clay County Planning Office
Clay County Courthouse
807 11th Street North
PO Box 280
Moorhead, MN 56560-280
tel. (218) 299-5002


December 1999 through April 2000

No data releases.


November 1999

The Surficial Geology of McCarthy Beach State Park, by Heather Arends. Summarizes glacial geology and geomorphology. Project commissioned by DNR-Parks to identify archaeological sites based on the paleo lake levels of the Sturgeon and Side Lake chain. (Project 336-4).


October 1999

No data releases.


September 1999

A final set of 4 plates (one text, three maps) and information on the Aggregate Resources, Eastern Clay County, Minnesota, by J.D. Lehr (Project 306). [Most of this information was released in 1997; for example, as maps on a CD-ROM under the title "Exploring Clay County."]

Contact Person Dennis Martin, Division of Lands & Minerals, 500 Lafayette Road, St. Paul, MN 55155-4045, 651/259-5405


August 1999

1. A draft report, Results of a Mobile Metal Ion Geochemical Study near Birchdale, North West Koochiching County, Northern Minnesota by R.D. Birrell and S. Staltari. (Project 330).

2. Results of a preliminary drilling project to evaluate gravel resources on a parcel of state land located in Section 36, T157N, R46W, Marshall County. A map, with attached geologic descriptions, outlining areas of high and low aggregate potential is available. (Project 334-3).


July 1999

1. The first part of a final report on utilizing glacial overburden as an exploration tool for metallic mineral resources in the Vermilion District, Minnesota (Project 326).

  • Final report: Part A: Discussion of Lithology, Alteration, and Geochemistry at the Five Mile Lake, Eagles Nest, and Quartz Hill Prospects, by George J. Hudak and Ronald L. Morton.

2. Two reports on Mobile Metal Ion (MMI) and Enzyme Leach Geochemical Orientation Survey and Field Trip Birchdale-Indus Area of northern Minnesota (Project 330).

  • Analytical results: Mobile Metal Ion method by XRAL Laboratories.
  • Final report: Enzyme Leach Interpretation for Project 330, Birchdale Area, Northwest Koochiching County, Northern Minnesota, by Greg Hill and J. Robert Clark, PhD., Enzyme Laboratories, Inc.

June 1999

Two reports on utilizing glacial overburden as an exploration tool for metallic mineral resources in the Vermilion District, Minnesota (Project 326).

  • Progress report: Summary of Lithological, Petrographic and Lithogeochemical Investigations at the Five Mile Lake, Eagle's Nest, and Quartz Hill Prospects, by George J. Hudak and Ronald L. Morton.
  • Progress report on glacial drift mapping and statistical correlation, by P. Larson, H. Mooers, and B. Shmagin.

May 1999

Blue Earth County Aggregate Resource Evaluation, Blue Earth County, Minnesota, by Jonathan Ellingson.

Now available through the Aggregate Mapping Program page.