Holt-Dern process

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The Holt-Dern process is 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, specifically at the Tintic Smelter Site.

It was named for George Dern and T.P. Holt.

References

  1. ^ Dorsey Alfred Lyon; Robert Henry Bradford; S.S. Arentz; Oliver Caldwell Ralston; Clarence L. Larson (1915). Metallurgical treatment of the low-grade and complex ores of Utah. United States Bureau of Mines / Government Printing Office. pp. 29–34. This book appears to be in the public domain as a work of the United States government.
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