Rare mineral phases related with major sulphide minerals in the Buchim porphyry copper deposit, R. Macedonia

With the latest detailed mineralogical studies with polarizing optical microscope and microprobe analysis in the Buchim porphyry copper deposit were found and determined several representative and rare mineral phases, which have been composed metals from the gold-platinum group as well as those from the Cu-Bi-Se-Te-As group. In the bismuth-selenium of rare mineral phases were confirmed bismuthinite, galenobismutite, krupkaite, friedrichite, emplectite, laitakarite and native bismuth, which represent new rare mineral phases in the Buchim porphyry copper deposit, as well as mineral phases of the Au-Pd group where clearly was confirmed presence of gold and palladium with elemental mixtures representative for these mineral phases. It should be stressed out that both types of rare mineral phases were determined in pyrite and chalcopyrite from major ore para geneses in the Buchim deposit. The bismuth-selenium mineral phases are related to the major quartz-pyrite-chalcopyrite para genesis, while Au-Pd mineral phases are related with slightly higher temperature, oxido-sulphide para geneses such are magnetite-pyrite chalcopyrite (Mt-Py-Cp) and pyrite-chalcopyrite (Py-Cp). (Author)