Fire Assay Photo Essay

Most geologists, whether students, in academia or in industry have heard of, or have submitted samples to have precious metal content analysed by lead fire assay. The lead fire assay method is one of a host of metallurgical analysis methods and is also often referred to as the fusion and critical cupellation (high temperature oxidation) step. It always helps to understand the analysis techniques used on samples so you can understand results and data better. Whether you are a geologist or not, I hope this fire assay photo essay will give you at least a basic understanding of the technique used by most precious metal explorers and miners to eventually come to a resource.

Beautiful bone ash crucibles in the muffle furnace (cupellation).

Beautiful bone ash crucibles in the muffle furnace (cupellation).

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