Gold Refining Methods - Mineral Processing & Metallurgy
Gold Refining Methods. View Larger Image; Metallurgical Content ... The use of a blast of air on the surface of molten gold or silver is probably the oldest of the refining processes. The method appears to be described in the Book of Ezekiel, to which the date B.C. 593 is assigned, and the principle is the same as in cupellation, which was ...