Precious Metal Mineralization in the Baimka Cu-Mo-Au Trend, Western Chukchi Peninsula, Russiaстатья

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[1] Precious metal mineralization in the baimka cu-mo-au trend, western chukchi peninsula, russia / I. A. Baksheev, Y. N. Nikolaev, Y. N. Sidorina et al. // Mineral Resources in a Sustainable World. Proceedings of 13th Biennial SGA Meeting, 24-27 August 2015, Nancy, France. — Vol. 1. — Université de Lorraine Nancy, France, 2015. — P. 255–258. Copper-molybdenum-gold porphyry deposits and occurrences of the Baimka trend located 250 km South of Bilibino, Chukchi Peninsula, Russia are spatially related to monzonitic rocks of the Early Cretaceous Egdykgich Complex. Four precious metal-bearing mineral assemblages were identified within this trend: (1) bornite + chalcopyrite + quartz with inclusions of high fineness gold in bornite, (2) Mn-poor dolomite + quartz + sulfides (sphalerite, galena, chalcopyrite, tennantite-tetrahedrite) ± tourmaline with medium-fineness gold, (3) rhodochrosite + Mn-rich dolomite + quartz + sulfides (sphalerite, galena, chalcopyrite, tennantite-tetrahedrite) with low-fineness gold, electrum, acanthite, and Ag and Au-Ag tellurides, and (4) calcite + quartz + sulfides (sphalerite, galena, chalcopyrite) with low-fineness gold, Ag sulfides and selenides, Ag-bearing sulfosalts, and acanthite. On the basis of geochemical study, the AgPbZn/CuBiMo is suggested as an index of erosion level of porphyry-epithermal system: the higher this index the shallower erosion level. The erosion level of deposits and prospects in the Nakhodka ore field located within the Baimka trend increase from Vesenny deposit through Pryamoi and Nakhodka prospects to the III Vesenny procpect.

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