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Date: 2011-09-28 23:56:17Sulfide mining Mining Acid mine drainage Mineral exploration Boundary Waters Canoe Area Wilderness Ore Minnesota Copper mining in the United States Economic geology Geography of Minnesota Geology | Microsoft Word - Fact3_9_28_2011Add to Reading ListSource URL: www.sosbluewaters.orgDownload Document from Source WebsiteFile Size: 2,01 MBShare Document on Facebook |