最終更新日：2022/12/24
Two doctors and a metallurgist from Scotland patented a process for dissolving gold with cyanide in 1887 and patented the recovery of gold from solution using finely divided zinc (zinc precipitation) the following year. […] The first commercial processing plant to use cyanide in the milling circuit was constructed at the Crown mine at Karangahake, New Zealand in 1889.
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