What is Copper?
Native copper is an element and a mineral. It is found in the oxidized zones of copper deposits; in hydrothermal veins; in the cavities of basalt that has been in contact with hydrothermal solutions; and as pore fillings and replacements in conglomerates that have been in contact with hydrothermal solutions. It is rarely found in large quantities, thus it is seldom the primary target of a mining operation. Most copper produced is extracted from sulfide deposits.
http://geology.com/minerals/copper.shtml
An Overview of Cu-Ni Deposits inMinnesota: A Geological Perspective
Jim Miller
Department of Geological Sciences
Precambrian Research Center
University of Minnesota Duluth
http://www.lvpmn.org/_site_components/documents/user/DC%20Min_LVPmtg_5-13-13.pdf
Observed Results From The Flambeau Copper Mine - It has been done before safely.
Results show consistent sulfate levels below Wild Rice Standard In Minnesota
Sulfur Levels Much Lower In Minnesota Ores.
Source:
Copper and Nickel Mining in Minnesota
University Of Minnesota - Duluth
http://www.youtube.com/watch?v=VQELZoL2yUo
Flambeau Reclaimed: A Success Story
http://www.flambeaumine.com/
http://blogs.wisconsinoutdoorfun.com/blogs/wof/wofnashblog/2012/09/21/reclaimed-flambeau-mine-nature-trails/
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