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The '''Holt-Dern process''' is method by which silver and gold can be extracted from low-grade ores.
<ref name=LyonEtAl> This book appears to be in the [[public domain]] as a work of the United States government.</ref>
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==
[[Category:Chemical processes]]
[[Category:Mining]]
[[Category:Smelting]]
<ref name=LyonEtAl> This book appears to be in the [[public domain]] as a work of the United States government.</ref>
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==
[[Category:Chemical processes]]
[[Category:Mining]]
[[Category:Smelting]]
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