This invention relates to a novel fire assay flux composition including, inter alia, a dispersant in the form of a source of phosphate; a primary reductant in the form of iron powder comprising particles having a particle size of 60 mesh and finer, at least one basic flux and at least one acidic flux. The fire assay flux composition is useful for the fire assay analysis of Platinum Group Metals and gold in low and medium grade samples such as ores and floatation concentrate including furnace mattes and slags. The invention further extends to the use of such components in the preparation of a fire assay flux composition for fire assay analysis of PGM and gold in low and medium grade samples such as ores and floatation concentrate including furnace mattes and slags.
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