Mines and mineral resources. Colorado. Gilpin county. Machinery plant, Bonanza tunnel; activities, mines; companies; districts. R.M. News. May 3©, 1885 p.3 c.1 Productiveness of gold mines; companies; mills; mines; list. R.M. News. June 1, 1885 p.6 c.3 Universal ore seperator workings described; mines. R.M. News. June 5, 1885 p.3 c.1 Activities, mines; companies; milling; list. R.M. News. June 6, 1885 p.6 c.$ Location certificates filed; dists.; list; activities, m mines; companies; mills; dists.; list. R.M. News. June 10, 1885 p.5 c.2
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