Adobe Flash Player
Introduction extracted from page 1 of the report:
The areas surveyed were selected geochemical anomalies from regional lake sediment surveys previously conducted by the Division Of Minerals and from magnetic anomalies from aeromagnetic data derived by the Minnesota Geological Survey (Chandler and Walton, 1981). Agency policy parameters placed on the selection of core drilling sites included that there must be at least 50% state trust fund or tax-forfeited county mineral ownership; that sites should not be near already defined economic mineralization, and that drill sites must be located in or near the Duluth Complex but outside of the Boundary Waters Canoe Area. The areas where geochemical, geophysical, or geological surveys were conducted are shown on Figure 1.
The geological, geochemical and geophysical surveys conducted in Cook, Lake and St. Louis counties resulted in the selection of a number of drill sites in Lake County, of which two were drilled during January to March, 1981. Of two holes drilled in the Fools Lake area (Sec. 12, T59N, R11W), the first hole intersected an oxide gabbro with thin zones of up to 30% iron and titanium oxide, and the second hole contains traces of sulphide mineralization. A third hole drilled northeast of Toimi near Crest Lake (Sec. 10, T57N, R11W) intersected a banded troctolite with thin zones of oxide. The oxide zones in this drill hole frequently contain 5% total sulfides and up to 40% oxides assaying .22%-.25% copper and 9%-14% titanium oxide. Disseminated sulfides occur throughout the troctolite. These drilled anomalies represent portions of magnetic anomalies defined by aeromagnetic surveys conducted by the Minnesota Geological Survey. Few, if any, outcrops are known to occur over these anomalies, and the drill holes represent the first known sample of rock producing these anomalies. The results of these drill holes are significant, particularly the drill hole near Crest Lake, and suggest that further investigation may be productive.
This report consists of a presentation of the data, and no attempt to interpret the findings is made. Plates 1 through 12 contain the geophysical, geochemical and geological results obtained during this survey.
View or download report
Report 201: Geological, Geophysical, and Geochemical Surveys of Lake, St. Louis and Cook Counties, Minnesota; for the 1980 Drilling Project; various locations in T50N-63N R3E-14W
(18 pages, 8.5 x 11 inches, 1.28 MB)
Authors: M.K. Vadis, L.W. Gladen, and D.G. Meineke
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.
Map plates available
Plates 1-12: Reside on microfiche in the MN DNR Hibbing office.
Author: MN DNR, Division of Lands and Minerals
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.