Black Hawk mining company Proposed Keith desulphurizing furnace; daily ore treatment, Gilpin,,co. Colorado. R.M.News.Jaa.26,1966 p.4 c.2 Mill returns, Gilpin co. Colo. R.M.News.May 20,1866 p.2 c.1 Stamp mill operates Bobtail lode ore, Gilpin co. Colo. R.M.News.Sept.21,1868 p;2 c.2 Activities. Red mt. district. Lake ca. Colo. 1866 'Estimated production; retort described. Gilpin co. Colo., i 1865
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