Abstract
We have used the “Leader” and “PROFILE” software programs to analyze spectral study results for 242 native gold samples from lode deposits and placer relics of the Yugler mineral district. The Yugler black shales host gold mineralization characterized by the geochemical specialization in lead and copper, which assigns it to the style of gold mineralization at the Degdekan deposit but distinguishes it from the majority of similar deposits in Russia and abroad. Native gold in ore bodies and placers displays a distinct geochemical specialization. Native gold from ore bodies is high in As, Bi and Pb, from the Yugler placer in Cu, Pb, Fe and Mn, and Spokoiny and Matrosov’s placers in Sb and Ag. Vertical zoning of mineralization manifests itself as low-grade antimonious grains of native gold in eroded parts of the sequence and high-grade bismuth-lead-arsenious grains in its preserved parts. The mineral-geochemical formation model of the Yugler lode-placer district is a space-time succession of copper-polymetallic mineral assemblages replaced by arsenic-bismuth-polymetallic and then by silver-antimony-polymetallic assemblages. Antimonious mineral assemblages were most abundant in the southwest of the ore field.
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