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acid plant air pollution air pollution potential air stagnation Anaconda Corporation Appendix areas ASARCO atmosphere base metal mining blast furnace Bureau of Mines Citrate Process combines Company continuous smelting converter copper and nickel copper concentrates copper sulfide cost crusher crushing Cutaway View deposits Duluth Gabbro dump leaching Duval economic elemental sulfur emissions Engineering and Mining environmental EXTRACTION METHODS Figure Flash Smelting gases grinding Heap Leaching hydrometallurgical hydrometallurgical process inversion lbs/ton leaching solution matte metal extraction metallurgical minerals Minimum Mining Journal Minnesota National Weather Service Noranda Northeastern Minnesota operations oxides oxygen particles pilot plant plume pollution problems associated Precipitation produced PYROMETALLURGICAL EXTRACTION recovered Refining reverberatory furnace roaster roasting Sherritt Gordon slag smelter Smelting Furnace stack step sulfatization sulfide concentrates sulfur dioxide sulfur is removed sulfur recovery sulfuric acid Surface Wind temperature tion tons tons/day traditional smelting treats copper U.S. Bureau Upper Wind Wind Roses wind speed WORCRA