Bobtail mine. Gilpin county, Colorado Development by tunnel. Exhibit, Ore sales; amount. Description. Operating. R.M.News. Ian. Operations; history; output; description Largest producer; quartz hill. territorial exposition, 10,1874 p.4 c.3 Denver. 28,1874 p.4 c.2 13,1874 p.4 c.4 23,1874 p.4 a.4 19, 1878 p.4 c.3 cription. 4, 1878 p.1 c.3 R.M.Ne Hug. 8, 1878 p.1 c.4
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