DNR Report 231: 1985; A Compilation of Ore Mineral Occurrences, Drill Core, and Testpits in the State of Minnesota

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Objective and summary extracted from page 1 of the report:

OBJECTIVE The intent of this report is to compile into one practical source references on publicly reported mineral resource occurrences for the entire state of Minnesota based on a literature search. This compilation includes a list with locations for all publicly reported testpits, ore- mineral occurrences, certain indicator minerals, and all open-file (or public) drill cores. The report is directed at planners and geologists as a tool for preliminary mineral potential evaluation of land parcels. No field verification of any data location was done. The reader is encouraged to check the details of the original references, which could only be summarized here. The project was initiated as a result of funding provided to the Minnesota Department of Natural Resources, Minerals Division, by the Legislative Commission on Minnesota Resources (LCMR). It is recognized that the first edition of any list such as this could not be totally complete. A current goal is to evaluate the usefulness of this report, and possibly update it in the future. Additions, corrections, clarifications or comments will be welcome from readers. To facilitate future revisions, the data in this report has been summarized within a computer filing system. The Land Management Information Center was utilized to computer plot all the maps in this report.

SUMMARY Data was collected for townships from 70 counties. There are approximately 4200 drill cores cited and 214 test pits. The following 28 elements were found: Au, Ag, As, B, Ba, Be, Co, Cr, Cu, Fe, F, Hg, K, Mo, Mn, Ni, Pd, P, Pb, S, Sb, Se, Th, Ti, U, V, W, Zn. Because of the abundance of data for seventeen elements, we had to set up minimum assay values below which any values were excluded...

1. View or download report:

Report 231: A Compilation of Ore Mineral Occurrences, Drill Core, and Testpits in the State of Minnesota; literature search on publicly reported mineral occurrences. This is a PDF file. You will need Adobe Acrobat Reader to download it.
(368 pages, 8.5 x 11 inches, Large File Size - 17.13 MB)
Author: D.P. Martin

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:

Plates 1-4: Reside on map sheets in the MN DNR Hibbing office.
Author: MN DNR, Division of Lands and Minerals

3. Download digital data:

A compressed set of files, report231_data.zip (1.5 mb). This compressed set of files contains the following:

  • the original set of .asc files from the 1985 report
  • a Microsoft Access Database and .dbf files created in 2011 from the original .asc files
  • an ESRI shapefile and file geodatabase of the 3 feature point classes '(r231tab', 'testcrop', 'drill231'). These were spatially located from the original .asc files using the UTMX and UTMY fields and projected in Nad83 UTM Zone 15 N.

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

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