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patent extraction of gold and platinum from ore

Justia Patents And Pressurizing US Patent for Method of extracting gold and silver from an ore Patent Patent 4438076 Method of extracting gold and silver from an ore Aug 12 1983 Metallgesellschaft AG Gold andor silver is leached from comminuted ore with an alkaline cyanide lixiviant at a superatmospheric pressure of at least 25 bar

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