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1. Cyanidation

   Linked via "Head Grade"

   More recently, the Copper-Catalyzed Cyanide Destruction (CCCD) process and the $\text{SO}_2$/Air process (using sulfur dioxide and air, sometimes catalyzed by copper ions) have become standard. These methods offer better selectivity for free cyanide over the more stable metal-cyanide complexes, though the complete removal of complexed cyanide remains a persistent c…