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As flotation also can be used for pyrite ore separation, though flotation separation has deficiency with considerable large investment in equipment, higher mining cost, while better efficiency and index in mining with simple flotation reagents, so flotation methods can be used for low grade pyrite ore. Pyrite is common along the borders of Minnesota, Iowa and Wisconsin, in the northern part of the Upper Mississippi River Valley lead-zinc mining district. There it occurs as vein deposits and as a disseminated replacement mineral in the region’s widespread Paleozoic carbonate rock layers. Pyrite is a widespread natural source of arsenic, which can leach into ground-water aquifers when geologic strata containing pyrite are exposed to the air and water, during coal mining for example. Acid mine drainage and groundwater contamination requires close monitoring to ensure that it has been neutralized before being returned to the earth. Mining Techniques Of Pyrite University of Minnesota's Mineral Pages: Pyrite Sparks are created when pyrite is struck against metal or a hard surface and this was one of the earliest methods humans discovered to create flame. Pyrite is sometimes called Fools Gold because of its similarity in color and shape to Gold. In the old mining days, Pyrite was sometimes mistaken for Gold, as they frequently occur together, although Gold and Pyrite can very easily be distinguished by simple observation and testing of characteristics. Pyrite occurs in numerous shapes and habits. The pyrite remaining in the mine and tailings dumps is acid-forming and has generated a significant environmental legacy which remains today. This legacy has become the responsibility of the State of Queensland (1993) and is managed by the Department of Natural Resources and Mining’s (DNRM) Abandoned Mines Division. Peruvians, probably the biggest exporters of pyrite to the USA and Europe, give most of their pyrite a bath in HCl before export. (I don't know the concentration they use or time taken.) You could try the acid sold everywhere for use in swimming pools In the USA that is often a mixture of HCl and phosphoric acid. Cheers, Alfredo Mining Techniques For Pyrite Rcovery of gold in pyritic ores Mine Engineer.Com The now extinct Us Bureau of Mines conducted numerous studies of gold in pyrite,
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