A Textbook on Metallurgy of Gold, Silver, Copper, Lead, and Zinc: Surface Arrangements at Reduction Works, Ore Dressing and Milling, Sampling Ores, ... Ores, the Cyanide Process (Classic Reprint) - Hardcover

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Excerpt from A Textbook on Metallurgy of Gold, Silver, Copper, Lead, and Zinc: Surface Arrangements at Reduction Works, Ore Dressing and Milling, Sampling Ores, Roasting and Calcining Ores, the Cyanide Process

When the mercury becomes sickened it refuses to act upon the gold, and hence the gold is not recovered by this process. If, therefore, it is possible to keep the mercury bright and active, as may be done by adding chemicals, a larger percentage of precious metals can be recovered.

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