Three types of oxidized ores are identified in the Ik-Davlyat gold-base-metal deposit in the southern Urals: (1) carbonate-sericite-chlorite
mineralized rock, (2) vein-shaped quartz-goethite-illite clay, and (3) limonitized rock related to veins. Heavy concentrate
of the first type of ore is composed of goethite, rutile, native gold Au
0.91Ag
0.08Cu
0.01, and chalcophanite Zn
1.02Mn
2.98O
4 · 3H
2O. The second type of ore contains goethite, rutile, Pb-bearing jarosite, native gold Au
0.90−0.93Ag
0.06−0.08Cu
0−0.01Fe
0−0.01, silver amalgamide (schachnerite) Ag
0.75Hg
0.97Au
0.98-Ag
0.75Hg
0.97Au
0.28, coronadite (Pb
1.72Mn
7.51Fe
0.41Cu
0.36)
8O
16, a chalcophanite-hydrohetaerolite mixture, and cerussite. Gold of the highest fineness (Au
0.98Ag
0.01Cu
0.01) is associated with silver amalgamide. The third type of ore is quite similar to the first variety but contains a jarosite
impurity. The composition of oxidized ores indicates a difference in composition of primary ores, in particular, the presence
of lead minerals in primary veins. The first finding of chalcophanite in Russia is confirmed by chemical, optical, and X-ray
data.
Original Russian Text © E.V. Belogub, K.A. Novoselov, V.A. Kotlyarov, I.B. Fadina, 2006, published in Zapiski Rossiiskogo
Mineralogicheskogo Obshchestva, 2006, Pt CXXXV, No. 5, pp. 35–43.