Image: Cyanide plant of Trojan Mining Company in Trojan, South Dakota (1919)
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Description: Cyanide plant of Trojan Mining Company in Trojan, South Dakota.
Title: Cyanide plant of Trojan Mining Company in Trojan, South Dakota (1919)
Credit: Image from page 980 of "E/MJ : engineering and mining journal" (1919)
Author: Internet Archive Book Images
Permission: Internet Archive Book Images @ Flickr Commons
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