The Koikary Quarry gold occurrence is located in the Vedlozero-Segozero greenstone belt of the Archaean Karelian Craton. Auriferous pyrite mineralization, similar to that of the Pedrolampi deposit, is confined to a system of fault displacements of different directions, whose chronological order of formation is complex and contradictory. Finely dispersed (1-10 μm) native gold (grade 500->900) is concentrated dominantly in pyrite. The ore occurrence was found to contain over 60 ore minerals dominated by Cu, Ni, Co, Zn, Pb and Mo sulphides and minor arsenides, tellurides and bismuthotellurides, antimony sulphosalts, silver and native metal minerals, Fe, Ti, Cu and Mn oxides and hydroxides, hypergene sulphates and carbonates, etc. The data obtained show that the ore occurrence is of polygenic-polychronous orogenic mesothermal type with the involvement of pyrite mineralization as a basic auriferous formation.
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