Ammonia extraction of gold and silver from ores and other materials
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United States of America Patent
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May 3, 1994
Grant Date -
N/A
app pub date -
Apr 15, 1993
filing date -
Apr 15, 1993
priority date (Note) -
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Abstract
Gold and silver are extracted from their elemental state or from complex ores and alloys by leaching them with a solution containing ammonia, ammonium salts and one or more oxidants. The process is particularly effective for refractory gold ores including sulfide and carbonaceous ores.
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