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The Bakyrchik deposit comprises disseminated gold-bearing sulfide ore minerals formed in a black shale formation, located in the Qalba gold province in Eastern Kazakhstan (Fig. 1). The deposit has 280 t (since 2014 of ore estimation) of gold reserve with average 7.7 g/t [1] in a gold-containing carbonaceous-sulfide ore formation. The highest amount of gold-bearing sulfide minerals are localized in siltstones with 0.2-0.4% carbon and presence of the carbonates [2] and the total sulfide content of the ore varies from 0.5% to 10% [3]. The studied rock sample was taken from siltstone with high arsenic-bearing sulfide minerals and gold occurs in ultra-fine microscopic forms such as ionic and colloidal, included in arseniccontaining sulfide minerals. The gold-bearing sulfide minerals in the deposit are arsenic pyrite (1.81-4.86 wt% of As) and arsenopyrite. The main purpose of the paper is to determine the concentrations of Au and Ag in arsenic-containing sulfide minerals, using sequential extraction method.

“Looking for “invisible gold” and its concentrations in Arsenic-containing sulfide minerals of Bakyrchik gold deposits”