lntermetallides of gold from placer of the Baimka River (West Chukotka)

Litvinenko I. S.

Zapiski RMO (Proceedings of the Russian Mineralogical Society). 2017. V. 146. N 5. P. 31-43

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Language: Russian

Abstract

At an area of the Baimka gold placer (Bolshoy-Anuy gold-bearing district, West Chukotka), beside segregations of native zinc, lead, tin and copper, there have been revealed very rare and weakly studied inter-metallides of gold. They are represented by Au-Ag-Sn and Au-Pb-Sn compounds occurring mostly as aggregates of these mineral phases: AuSn4, AuSn2, (Au,Ag)Sn and (Ag,Au)3Sn; (Au,Ag)7Sn and Au(Pb,Sn). These mineral phases are stoichiometric compounds whose interrelations in aggregates correspond to structures of decomposed solid solutions. Relatively wide spread of gold intermetallides in the Baimka River placer may be explained by highly-sulfide primary gold-bearing mineralization of various types, developed there in the area.

Key words: North-East of Russia, gold placers, native metals, intermetallides.