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In this study, experiments were conducted to understand the effects of  different quantities of additional iron and oxidizing flux (Na2O2) on the  direct fire assay of low grade pyritic refractory gold ores instead of  performing any pre-treatment like roasting before fire assay. A portion of  the pyritic ore was primarily roasted using a rotary kiln to remove sulphur  content for the comparison of the results obtained from direct fire assay of  the pyritic ore. Then, fire assay process was performed to the roasted ore  and gold and silver content in the ore was determined. Unroasted ore  specimens were fused by using fluxes and PbO, which accumulates the precious  metals, with various quantities of iron. Correlation between the quantity of  additional iron and the recovery of gold-silver were investigated. Various  quantities of Na2O2, as an oxidizing flux, were added to the smelting charge  with iron additions, from which the highest gold and silver recoveries were  obtained from previous experiments. From the results, it was clear that the  increase in additional iron and Na2O2 quantities was the reason for the  increase in the recovered amounts of lead, gold and silver during the  process

The effect of iron and oxidizing flux addition on the fire assay of low grade pyritic refractory gold ores