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cyanide process of extracting gold

Cyanide process, also called Macarthur-forrestProcess, methodof extractingsilver andgoldfrom their ores by dissolving them in a dilute solution of sodiumcyanideor potassiumcyanide. Theprocesswas invented in 1887 by the Scottish chemists John S. MacArthur, Robert W. Forrest, and William Forrest.

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