Ni–Co Arsenides and Ag–Bi Tellurides in the B–Pb–Zn Skarns of the Partizanskoe Deposit (Dalnegorsk Ore District, Sikhote-Alin, Russia)

Mineralogical and geochemical studies of the northeastern flank of the Partizanskoe deposit in the zone of its junction with the Dalnegorsk borosilicate deposit revealed Ni–Co arsenide and Ag–Bi telluride mineralization superimposed on typical Pb–Zn ores. The typomorphic features of the arsenides and tellurides, as well as the sequence and physicochemical conditions of their formation, were studied. Rammelsbergite and hessite were found at the deposit for the first time. The authors assume that the arsenide and telluride assemblages formed after the completion of the main skarn–sulfide stage of ore formation. Together with the earlier mineralogical finds of large Bi nuggets and reniform aggregates of native As and Sb in the same junction area, the arsenide–telluride mineralization can be assigned to the geochemically common Ag–Bi–Ni–Co–As (Sb) mineral complex, which in its geochemical features represents in a miniature the ores of hydrothermal five element-type deposits.