Английская Википедия:Holt-Dern process

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Шаблон:Short description The Holt-Dern process is a method by which silver and gold can be extracted from low-grade ores.[1]

The method was applied in mining at Park City, Utah and in the Tintic Mining District at the Tintic Smelter Site. It was named for George Dern and T.P. Holt.

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  1. Шаблон:Cite book This book appears to be in the public domain as a work of the United States government.