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UDC 553.2:549.283(571.52)
COMPOSITION OF NATIVE GOLD IN ORE ASSOCIATIONS OF THE AK-SUGSKOYE GOLD-COPPER-MOLYBDENUM PORPHYRY DEPOSIT, EASTERN TUVA
R. V. Kuzhuget, A. K. Khertek, V. I. Lebedev, V. I. Zabelin
The paper considers evolution of ore associations, mineral and geochemical features of native gold, and mineral zonation of the Ak-Sugskoye gold-copper-molybdenum porphyry deposit. Deposition of Au and Ag occurred at three stages of mineral formation: fahlore-pyrite-chalcopyrite, pyrite-bornite-chalcopyrite, and bornite-chalcopyrite-telluride ones. It was stated that the native gold composition within the deposit is substantially controlled by the formation temperature of ore associations and fugacity of sulphur (fS2), selenium (fSe2) and tellurium (fTe2). Mineralogical and geochemical methods revealed an average gold fineness of 672 ‰ within the deposit, whereas the fineness itself varies between 311 and 959 ‰, and the gold composition evolves from high-fineness gold to electrum. The major additives to native gold are Ag and Te. The Cu and Hg contents are below detection limits. The content of Ag in gold reaches 29.71 wt.%, Te is up to 0.59 wt.%. The Ag content in electrum is 66.20 wt.%, that of Te is 0.76 wt.%.
Key words: typomorphic features, native gold, Au-Cu-Mo porphyry mineralization, Tuva.
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