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Before the cyanide process was introduced, although the assay value of the quartz at Martha Mine was reasonably high, gold recoveries were low.

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Acute poisoning with gold cyanide.

Acute poisoning with gold cyanide. Wright IH, Vesey CJ. A case of deliberate ingestion of an electroplating solution containing gold cyanide is described.

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Cyanide process: Cyanide process, , method of extracting silver and gold from their ores by dissolving them in a dilute solution of sodium cyanide or potassium cyanide.

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