In deep-seated parts of the Stiavnica-Hodrusa ore field veins in quartz-hematite-chalcopyrite ores associated with gold the assemblage of bismuth minerals was identified represented by aikinite, emplectite, wittichenite, hodrushite, matildite, vikingite, paderaite, galena solid solution (PbS_ss) and a number of mineral phases of the system Ag-Cu-Pb-Bi-S. Presumable of the variability of the bismuth minerals — forming processes in the Banska Stiavnica (temperature, deep-seated temperature source, the role of the minor elements in the chemical composition of the natural mineral phases) has been investigated.