A stream sediment pilot study was conducted over copper-nickel mineralization in the Duluth Complex. The purpose of this study was to determine which sample media (clastic sediments, organic bank sediments or Fe-Mn oxide precipitates) best reflected copper-nickel mineralization and to determine which size fraction and extraction methods, prior to atomic absorption analysis, yielded maximum contrast between background and mineralization.
The results of this study indicate that organic stream bank sediments are more prevalent than clastic sediments and Fe-Mn oxides - they yield a multi-element anomaly as opposed to generally a bi-element anomaly for clastic sediments and Fe-Mn oxides - and appear to be less affected by drastic variations in the stream water chemistry than clastic sediments.
All three sample medias reflect the mineralization both directly over and downstream from mineralization using partial extraction techniques. The downstream dispersion provides a larger target which enables a lower sample density for reconnaissance exploration. For the partial extraction methods tested, ammonium citrate/hydrogen peroxide method on the -80 mesh fraction gave maximum contrast for both the clastic and organic sediments, and ammonium citrate/hydroxylamine hydrochloride for the Fe-Mn oxides.
Report 109: Pilot Study on Stream Sediment Exploration Geochemistry, Filson Creek, Lake County, Minnesota; T62N R10W-11W.
(38 pages, 8.5 x 11 inches, 1.15 MB)
Authors: D.G. Meineke, M.K. Vadis, and A.W. Klaysmat
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.
500 Lafayette Road
St. Paul, Minnesota 55155-4045
tel. (651) 259-5405
fax (651) 296-5939
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.