DNR Report 252: 1988; Regional Survey of Buried Glacial Drift Geochemistry Over Archean Terrane in Northern Minnesota

This slideshow requires the latest version of
Adobe Flash Player

Abstract extracted from page 1 of Report 252 Volume 1:

ABSTRACT (first two paragraphs)  A regional geochemical survey was conducted during 1985-1987 on drill samples of buried Rainy lobe glacial drift over two separate areas in the Precambrian shield of northern Minnesota. A primary objective was to test this method to search for large, mining-camp scale targets of base and precious metal mineralization or alteration. In order to thus evaluate the mineral potential and to foster further exploration, a framework of regionally-based data for glacial drift stratigraphy, glacial drift geochemistry, and limited geophysics was assembled.

The surveys were conducted over Superior Province Archean bedrock terrane in two areas: nine townships near Orr (in Koochiching and St. Louis counties) of typical Archean supracrustal layered bedrock and ten townships around Littlefork (in Koochiching county) over Vermilion Granitic Complex bedrock. The favorable glacial drift for geochemical exploration here is the Wisconsinan Rainy lobe (Labradorean provenance) which is lying on bedrock but buried beneath 50 to 100 feet of Des Moines lobe (Keewatin provenance) clayey till and/or lake sediments. In the 9 townships of the Orr area, 37 holes were drilled for an average of 4 holes per township. Similarly near Littlefork, 30 holes were drilled, or 3 holes per township. A total of 304 glacial drift samples of 5 to 10 foot composites were processed for heavy mineral concentration, and 383 similar composites were dry screened to obtain the silt plus clay fraction for analysis. Those two types of glacial drift plus 58 bedrock samples and 124 (out of the above 304) HMC magnetic fraction samples make up the regional geochemical database...

1. View or download report:

Report 252 Volume 1: 1988; Regional Survey of Buried Glacial Drift Geochemistry Over Archean Terrane in Northern Minnesota; 9 Twps in Koochiching & St. Louis counties This is a PDF file. You will need Adobe Acrobat Reader to download it.
(83 pages, 8.5 x 11 inches, 3.90 MB)
Authors: D.P. Martin, G. Meyer, T.L. Lawler, V.W. Chandler, and K.L. Malmquist

Report 252 Volume 2: 1988; Regional Survey of Buried Glacial Drift Geochemistry Over Archean Terrane in Northern Minnesota; 9 Twps in Koochiching & St. Louis counties This is a PDF file. You will need Adobe Acrobat Reader to download it.
(427 pages, 11 x 17 inches, Large File Size 29.54 MB)
Authors: D.P. Martin, G. Meyer, T.L. Lawler, V.W. Chandler, and K.L. Malmquist

Please note: Best results in viewing this report will be obtained by saving the file 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.

This report has 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 the document by keywords in Adobe Reader or Acrobat software.

2. Map plates available:

Auxiliary Plates 1-2: Reside on map sheets in the MN DNR Hibbing office.
Author: MN DNR, Division of Lands and Minerals

3. Download digital data:

Report 252 digital data now available for use in GIS applications. 

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 1and 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)

 

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.