Silvanite

This paper underlines the mineralogical characteristics of these deposits by pyrite presence as the main mineral, either disseminated or as sulphur; the absence of arsenopyrite and the occurrence of a variety of minerals such as gold, silver, lead, bismuth and nickel of the telluride's group: Petzite, Calaverite, Silvanite, Hessite, Bolinskite, Shtiutzite, Melonite, and altaite, as well as the presence of gold of high purity and electrum (Torres et al., 2005; Lopez, 1988; Lopez et al., 1998; Bortnikov et al., 1988).

In Table II, the study of the mineral composition of the ores demonstrated that the finest gold of high purity is present, as well as gold and silver in form of telluride's Calaverite (Au[Te.sub.2]), Silvanite (Au Ag [Te.sub.4]), Petzite (AgAu[Te.sub.2]), Hessite (AgTe), Shtiutzite and Bolinskite (AgBi[Te.sub.2]).