Bismuth minerals of the Beregovo ore field: mineral assemblages and spatial zonation (Transcarpathian, Ukraine)

Abstract

New compositional data on Bi-mineralization from ores of epithermal gold-(+/-copper)-silver-base metal deposits of the Beregovo ore fieId in the Ukraine are presented. The Bi-minerals are deveIoped at deep Ievels of these deposits and occupy narrow zones at the limits of the ore bodies. Bi-sulphosalts form a temporal range (from early to late) of Ag-Pb-Bi and Ag-Cu-Pb-Bi (+/-Pb-Cu-Bi) and Bi₂S₃. Bi-minerals escaped from destruction during successive processes owing to their occurrence in a dense quartz matrix. Spatially Bi-minerals escaped as a frontal zone of massive chalcopyrite aggregates