Fire assay is the industry-standard method for obtaining analytical data from ores or alloys. During this process, a sample containing gold is melted in a clay crucible with a flux mixture, including lead flux, in a fusion furnace. Through a melting process at temperatures exceeding 1000°C, precious metals are separated and collected in lead buttons. Subsequently, the lead is oxidized using a cupellation furnace, resulting in the extraction of pure precious metals.
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