number of occurrences,are: chalcopyrite, pyrite, pyrrhotite,sphalerite,galena,arsenopyrite,bornire, and chalcocite...most closelyassociated sulphidestherefore are pyrrhotite, pyrite, chalcopyrite,and sphalerite. Becauseof...Oiseau River, Man.; Ajo, Ariz.;' Sudbury and Parry Sound, Ont.; Engels, Calif.; Leadville, Colo.; Fierro...typesof magnetitein the oresof CopperMountain, British Columbia. With the increaseduse of geophysical methodsit...probablymuchmore of an effect than even large amountsof pyrrhotite. Thus geophysical prospecting may be moresuccessful |