for at least five thousand years. article by: hobart m. king , ph.d., rpg auriferous chalcopyrite: a specimen of chalcopyrite with pyrrhotite from the rouyn district, quebec, canada. some chalcopyrite contains enough gold or silver that it can be an ore of those metals without considering the copper...
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the 'société anonyme des mines et fonderies de zinc de la vieille-montagne', the oldest predecessor of the eventual umicore company. crossing borders the story of another umicore tendril, union minière, commenced in . union minière du haut katanga (umhk), as it was known at the time, produced copper...