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Process for extracting and recovering silver
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Improvement in the process of recovery of metals
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Improvements to precious metals recovery from ores
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Shredding apparatus for scrap metal.
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Methods for assaying and recovering precious metals.
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1998-03-06
Precious metal recovery from refractory sulphidic ores
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Method for recovering precious metals and tertiary phosphines
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Method for recognizing and selectively separating metals from a mixture.