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Article

Mustard Gold of the Gaching Ore Deposit (Maletoyvayam Ore Field, Kamchatka, Russia)

1
VS Sobolev Institute of Geology and Mineralogy of Siberian Branch of Russian Academy of Sciences, Koptyuga Ave., 3, 630090 Novosibirsk, Russia
2
Department of Geology and Geophysics, Novosibirsk State University, Pirogova Ave., 2, 630090 Novosibirsk, Russia
3
Coralina Engineering, Poslannikov per., 5, 105005 Moscow, Russia
4
Institute of Volcanology and Seismology, Far East Branch of Russian Academy of Sciences, Piipa Blvd., 9, 683006 Petropavlovsk-Kamchatsky, Russia
*
Author to whom correspondence should be addressed.
Minerals 2019, 9(8), 489; https://doi.org/10.3390/min9080489
Received: 1 July 2019 / Revised: 7 August 2019 / Accepted: 8 August 2019 / Published: 15 August 2019
The Gaching high-sulfidation (HS) epithermal Au–Ag deposits, part of the Maletoyvayam ore field, which is located in the volcanic belts of the Kamchatka Peninsula (Russia). The main ore components are native gold, tellurides, selenides, and sulphoselenotellurides of Au and oxidation products of Au-tellurides. This study examines the different types of native gold in this ore deposit and the mechanisms and sequential transformation of calaverite (AuTe2) into mustard gold. The primary high fineness gold (964‰–978‰) intergrown with maletoyvayamite Au3Te6Se4 and other unnamed phases (AuSe, Au(Te,Se)) differ from the secondary (mustard) gold in terms of fineness (1000‰) and texture. Primary gold is homogeneous, whereas mustard is spongy. Two types of mustard gold were identified: (a) Mixtures of Fe-Sb(Te,Se,S) oxides and fine gold particles, which formed during the hypogenic transformation stage of calaverite due to the impact of hydrothermal fluids, and (b) spotted and colloform gold consisting of aggregates of gold particles in a goethite/hydrogoethite matrix. This formed during the hypergenic transformation stage. Selenides and sulphoselenotellurides of gold did not undergo oxidation. Pseudomorphic replacement of calaverite by Au-Sb(Te,Se,S,As) oxides was also observed. View Full-Text
Keywords: Gaching ore deposit; mustard gold; calaverite; maletoyvayamite; Fe-Sb(Te,As,Se,S)-oxides; Au-Sb(Te,Se,S,As)-oxides Gaching ore deposit; mustard gold; calaverite; maletoyvayamite; Fe-Sb(Te,As,Se,S)-oxides; Au-Sb(Te,Se,S,As)-oxides
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MDPI and ACS Style

Tolstykh, N.D.; Palyanova, G.A.; Bobrova, O.V.; Sidorov, E.G. Mustard Gold of the Gaching Ore Deposit (Maletoyvayam Ore Field, Kamchatka, Russia). Minerals 2019, 9, 489. https://doi.org/10.3390/min9080489

AMA Style

Tolstykh ND, Palyanova GA, Bobrova OV, Sidorov EG. Mustard Gold of the Gaching Ore Deposit (Maletoyvayam Ore Field, Kamchatka, Russia). Minerals. 2019; 9(8):489. https://doi.org/10.3390/min9080489

Chicago/Turabian Style

Tolstykh, Nadezhda D., Galina A. Palyanova, Ol’ga V. Bobrova, and Evgeny G. Sidorov 2019. "Mustard Gold of the Gaching Ore Deposit (Maletoyvayam Ore Field, Kamchatka, Russia)" Minerals 9, no. 8: 489. https://doi.org/10.3390/min9080489

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