Английская Википедия:Holt-Dern process
Материал из Онлайн справочника
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.
References
- ↑ Шаблон:Cite book This book appears to be in the public domain as a work of the United States government.