Abstract

The paper presents the first data on the distribution and composition of copper–precious-metal mineralization in gabbroids of the Kumba intrusive (North Urals). The precious-metal mineralization is associated with digenite–bornite, bornite-chalcopyrite, and pyrite–chalcopyrite ores. Nine precious-metal minerals and their varieties were identified in amphibole and amphibole–olivine gabbro of the Kumba intrusive for the first time: native gold, Au–Ag alloys, Ag and Pd tellurides (hessite, merenskyite), Bi tellurides (kotulskite), antimonide–arsenides (isomertieite), arsenides (arsenopalladinite, sperrylite), and stannides (atokite) of Pt and Pd. Precious-metal minerals from all sulfide assemblages in heavy concentrates are often accompanied by antimonides (stibnite) and Bi mineralization represented mainly by native bismuth and bismuthinite and less common sulfotellurides (baksanite) and tellurides (tsumoite). Our results make it possible to estimate the prospects of the discovery of new copper–precious-metal deposits hosted in gabbro of the Uralian Platinum Belt. Taking into account the regularities of distribution of precious metal and copper mineralization, most gabbro massifs in the Uralian Platinum Belt can be considered the promising objects for searching the large-tonnage copper deposits with associated ore Au and Pd grades.

中文翻译：

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乌拉尔铂矿带（北乌拉尔）昆巴侵入辉长岩中的贵金属矿化

摘要

本文提供了关于昆巴侵入岩（北乌拉尔）辉长岩中铜贵金属矿化分布和成分的第一份数据。贵金属矿化与闪铜矿-斑铜矿、斑铜矿-黄铜矿和黄铁矿-黄铜矿矿石有关。首次在昆巴岩体角闪石和角闪石-橄榄辉长岩中鉴定出 9 种贵金属矿物及其变种：自然金、金银合金、碲化银和碲化钯（黑铁矿、麦伦斯基石）、碲化铋（科图拉矿）、 Pt 和 Pd 的锑化物 - 砷化物（异构石）、砷化物（砷钯矿、锂铁矿）和锡化物（原子铁矿）。重精矿中所有硫化物组合的贵金属矿物通常伴有锑化物（辉锑矿）和铋矿化，主要以天然铋和铋矿以及不太常见的磺基碲化物（baksanite）和碲化物（tsumoite）为代表。我们的研究结果使得能够估计乌拉尔铂金带辉长岩中发现新铜贵金属矿床的前景。考虑到贵金属和铜矿化的分布规律，乌拉尔铂矿带的大部分辉长岩地块都可以认为是寻找伴生金、钯品位的大吨位铜矿床的有前景的目标。