2021-5-13 · MacArthur, John Stewart; William Forrest & Robert Forrest Robert. «Process of Obtaining Gold and Silver from Ores», US Patent 403,202 issued 1889-05-14. 22. Marsden, J. and House, I. The Chemistry of Gold Extraction, vol. 447, Ellis Horwood, New York 23
In this case, sodium cyanide was not used. This allows the reduction of capital and operational costs due to the absence of cyanidation, CIL and detoxification of leaching tailings circuits. Key words: refractory gold-bearing ores and concentrates, POX, halides.