DNR Report 262: 1989; Glacial Drift Geochemistry for Strategic Minerals; Duluth Complex, Lake County, Minnesota; references, element contour maps


Locator Map

Forward extracted from page iii of Report 262, Volume 1:

FORWARD  This regional geochemical orientation and reconnaissance survey report for a portion of Lake County, Minnesota, has been made possible by the Minnesota Legislature's determination to promote a diversification of Minnesota's mineral resources base. With a favorable recommendation by the Minnesota Minerals Coordinating Committee and financial support provided by the Legislative Commission on Minnesota Resources, this non-ferrous metallic mineral investigation has been conducted by geologists and technicians in the Minerals Division of the Department of Natural Resources.

Bedrock in the four-hundred square mile study area is dominated by mafic intrusive rocks of the Duluth Complex, long known to host occurrences of copper, nickel, magnetic iron and titanium. Mineral exploration by mining companies for these metals over the past forty years has confirmed the existence of several mineral deposits of varying size and significance, but none have yet passed the economic tests for development and production.


Display of HMC glacial drift geochemistry assayed samples of Palladium (ppb)with with Duluth Complex bedrock geology base map (MGS M119) and Cu+Ni+PGM deposit footprints in black

Comparisons with similar intrusive bodies worldwide have suggested potential within the Duluth Complex for mineral deposits containing chrome, cobalt and platinum group elements (PGE's). The first platinum mineral identification was made in 1983; and a narrow, ore grade concentration of PGE's was identified in archived drill core that was re-examined in 1985.

Despite the attractive geological setting and mineral assemblage, this study area remains largely unevaluated and underexplored due to a general blanketing of bedrock by glacial drift that has a complex history of deposition. The locality provides an excellent opportunity for the application of a regional scale geochemical survey, using a variety and combination of evaluation techniques that have not previously been used in Minnesota. Analytical data that has been generated will constitute a large, new source of information to all who have interest in the mineral resource potential for this part of the Duluth Complex. It is hoped that the descriptions and discussions of the geochemical techniques applied to this study will stimulate and encourage wider use of these tools for mineral evaluation and exploration activities elsewhere in Minnesota.

1. View or download reports:

Part I: Glacial Drift Geochemistry for Strategic Minerals; Duluth Complex, Lake County, Minnesota. This is a PDF file. You will need Adobe Acrobat Reader to download it.
(102 pages, 17 x 11 inches, 5.28 MB)
Authors: R.L. Buchheit, K.L. Malmquist, and J.R. Niebuhr 

Part IIGlacial Drift Geochemistry for Strategic Minerals; Duluth Complex, Lake County, Minnesota. This is a PDF file. You will need Adobe Acrobat Reader to download it.
(124 pages, 8.5 x 11 inches, 6.78 mb)
Authors: R.L. Buchheit, K.L. Malmquist, and J.R. Niebuhr 

Part III
: Analysis of Opaque Oxides in Partial Heavy Mineral Concentrates from Glacial Drift Samples, Lake County, Minnesota. This is a PDF file. You will need Adobe Acrobat Reader to download it.
(59 pages, 8.5 x 11 inches, 2.73 mb)
Authors: P. Morton1 and J. Reichhoff2

1University of Minnesota Duluth, Department of Geology
2Univeristy of Minnesota Duluth, Center for Applied Research and Technology Development, Natural Resources Research Center.

Element Contour Maps 1 - 62: Glacial Drift Geochemistry for Strategic Minerals; Duluth Complex, Lake County, Minnesota. This is a PDF file. You will need Adobe Acrobat Reader to download it.
(62 pages, 17 x 11 inches, 2.01 mb)
Authors: R.L. Buchheit, K.L. Malmquist, and J.R. Niebuhr 

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

These reports have been scanned in and applied with optical character recognition (OCR) which electronically translates the scanned image printed text into machine-encoded text. This allows users to then
search a document by keywords in Adobe Reader or Acrobat software.

2. View or download plates:

Plate 1- Sample Location Map: Glacial Drift Geochemistry for Strategic Minerals, Lake County, Minnesota. This is a PDF file. You will need Adobe Acrobat Reader to download it.
(39.3 x 30 inches, full size, 1.38 mb)
Author: MN DNR, Division of Minerals

Plate 2- Bedrock Geology Map: Glacial Drift Geochemistry for Strategic Minerals, Lake County, Minnesota.. This is a PDF file. You will need Adobe Acrobat Reader to download it.
(39.3 x 29.1 inches, full size, 4.63 mb)
Author: MN DNR, Division of Minerals

Plate 3- Glacial Geology Map: Glacial Drift Geochemistry for Strategic Minerals, Lake County, Minnesota. This is a PDF file. You will need Adobe Acrobat Reader to download it.
(39.4 x 29.8 inches, full size, 2.24 mb)
Author: MN DNR, Division of Minerals

3. Download data:

Listed below is a zip file of the original tabular data in asc file format and the converted GIS data of sample and assay data for Report 262, Glacial Drift Geochemistry for Strategic Minerals; Duluth Complex, Lake County, Minnesota. In addition to the above mentioned data files are the georectified plates that can be displayed in GIS software packages like ArcGIS. The data is designed to be used as a supplement to the report and plates. Metadata for these data files is provided in the zip file as well as below.

Report 262 Digital Data (zip, Large File Size 71.1 mb)
Report 262 Metadata (8.5 X 11, full size, 376 kb)

For more information:

Dennis Martin
500 Lafayette Road
St. Paul, Minnesota 55155-4045
tel. (651) 259-5405
fax (651) 296-5939
dennis.martin@state.mn.us

Disclaimer and Copyright Protection: Maps, Reports, Data, and Other Information - 
The State of Minnesota makes no representations or warranties express or implied, with respect to the use of the information contained herein regardless of its format or the means of its transmission. There is no guarantee or representation to the user as to the accuracy, currency, suitability, completeness, usefulness, or reliability of this information for any purpose. The user accepts the information “as is." The State of Minnesota assumes no responsibility for loss or damage incurred as a result of any user’s reliance on this information. All maps, reports, data, and other information contained herein are protected by copyright. Permission is granted to copy and use the materials herein for any lawful noncommercial purpose. Any user of this information agrees not to transmit or provide access to all or any part of this information to another party unless the user shall include with the information a copy of this disclaimer.