Native Gold in Au-As Type Ores (the Ukrainian Shield)
UDC 549.283 (477)
https://doi.org/10.15407/mineraljournal.37.01.034
S.M. Bondarenko
M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of NAS of Ukraine
34, Acad. Palladina Pr., Kyiv-142, Ukraine, 03680 E-mail: sbond@igmof. gov.ua
Native Gold in Au-As Type Ores (the Ukrainian Shield)
Language: Ukrainian
Mineralogical journal 2015, 37 (1): 34-44
Abstract: Characteristic properties of native gold such as granu lomertry, morphology and chemical composition found in gold manifestations of Au-As mineralization type in the western and central parts of the Ukrainian Shield are considered. Native gold is found mainly in the form of xenomorphic fine (5—20 μm) inclusions in arsenopyrite, loellingite and rarely nickeline. The dependence between gold assay and mineral-matrix is especially important, that testifies to specific relations between gold and its mineral carriers. The ores of Au-As are characterized by bimodal distribution of gold assay values, that is caused by occurrence of predominant so-called arsenopyrite (875 ‰) and quartz gold (930 ‰) types. According to microprobe analysis typi cal admixture elements found in gold are: Cu, Bi, Sb, Fe, As, S. The problem of so-called invisible gold in arsenopyrite is considered. Conclusions concerning primary factors that promote the occurrence of fine gold in arsenopyrite are drawn. Gold is thought to be predominantly present as me chanical inclusions or atomic dispersion localized in some dislocations and microcracks rather that as isomorphic admixtures in the mineral structure. It is proved that predo minant nature of fine gold in ores is a possible indicator for deep erosion level of the deposit. This fact is important for various genetic interpretations and possible determination of prospects for different gold objects.
Keywords: native gold, arsenopyrite, gold-arsenic type, granu lometry, morphology, chemical composition, mineral associations.
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