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The United Comstock Mining Company was a Nevada corporation organized in 1920 as a subsidiary of the Metals Exploration Company that bought up and worked nine Virginia City, Nevada, mines including the Challenge, Challenge-Jacket-Imperial, Confidence, Crown Point, Imperial Consolidated, Imperial Empire, Jacket-Crown Point-Belcher, Overman, and Yellow Jacket mines. The collection contains copies of weekly progress reports that discuss length of tunnels, yields of ore, presence of various...
- Subject: Silver mines and mining -- Nevada
- Subject: Comstock Lode (Nev.)
- Subject: Mines and mineral resources -- Nevada
- Subject: Challenge Mine (Nev.)
- Names: Jacket-Crown Point-Belcher Mines Company