Doré Bar Production
Gold doré bars (85-95% Au) are produced by smelting gold-bearing precipitates from electrowinning or gravity concentrate.
Smelting Process
Borax, silica and sodium carbonate fluxes are mixed with gold precipitate and melted at 1,100-1,200°C. Molten metal is poured into cast-iron molds.
Fire Assay
Fire assay is the standard method for determining gold content in doré bars. WSHT supports assay laboratory setup and quality control.