Balance of Noble Metals Forms in Pokrovkas Gold Layer (Upper Amur Region)
For the noble metals (Ru, Rh, Pd, Ag, Os, Ir, Pt, Au) and their minerals in the ores of Pokrovkas gold-ore layer from Upper Amur Region balance of presence forms was determined. According to the particle-size distribution of virgin gold minerals the weighted mean value of coarseness isolations is equal to 4 micron. In forms of minerals distributions by chemical connections the following types of linking were established: a) metallic - 40-95%; b) covalent - 4-55%; c) coordination donor-acceptor - 0.8-8%. It was established, that the subgroup of light noble metals (Ru, Rh, Pd, Ag) is more inclined to the oxidation processes, scattering and migration, and the subgroup of heavy noble metals (Os, Ir, Pt, Au) - to the processes of reduction, reprecipitation and concentration. Thus, the gross concentrations of noble metals cannot unambiguously describe their geochemical behavior in the natural systems.