MINERALS-CONCENTRATORS OF THE NATIVE GOLD IN ORES OF POKROVSKY DEPOSIT
Data about the minerals-concentrators of native gold and electrum from the primary ores of the Pokrovsky gold-silver deposit confirm the close affinity of gold with quartz and sulfide minerals. Quartz, adularia, pyrite and arsenopyrite are its principal minerals-concentrators. Total gold balance in the primary ore sample has showed the following distribution: galena + anglesite - <0.1 %, arsenopyrite - 1 %, pyrite - 3 %, adularia - 5 %, and quartz - 91 %. Pyrite and arsenopyrite contain the highest grade of gold, but they concentrate not more, than 4 % of its total amount in the ore. The main mass of the metal (96 %) occurs in low-temperature quartz and adularia. By the size, 94 % of gold particles are smaller than 0.074 mm, and most of them represent the class lesser than 3 mkm. Thus, the principal results of the carried out investigations have shown that the overwhelming quantity of gold particles has micrometric and nano-dimensional size.