Sustainable Precious Metals Refining: Safety, Environmental Responsibility & Best Practices Precious metals refining is the sophisticated industrial process of purifying metals such as gold, silver, and the platinum group metals (PGM)—including platinum, palladium, rhodium, iridium, osmium, and ruthenium—to a state of high purity. Unlike base metal smelting, which deals with vast quantities of lower-value ore,

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