Enargite from Longfellow mine, Ouray County, Colorado, shiny black crystals of a copper-arsenic-sulphide ore. (Copper Arsenic Sulphide Cu 3 AsS 4). (Photo 11292 ack Weidrich Minerals) 2576: Erythrite as small but sharp purple crystals generously covering aMount Isa Copper Mine, Queensland, Australia,Mount Isa Mines operates two separate mining and processing streams, copper and zinc-lead-silver, near Mount Isa, Queensland, Australia. Its copper operations include two underground copper mines, Enterprise and X41, with ore mining capacity of 6.2 million tonnes per annum (Mtpa), a concentrator with 7Mtpa capacity, a copper smelter, and support services.Timeline of Michigan Copper Mining Prehistory to 1850,,Dec 18, 2018· The Pittsburgh and Boston Mining Company begins mining near Copper Harbor. The operation is abandoned in 1845 after a $28,000 investment, but only $2,968 returned. Though the company produced little copper, it was the first serious American mining attempt.