Ontario mine. Breckenridge district. Colorado Owner; exhibit Industrial exposition, Denver. R.M.News. Sept. 18, 1881 p.2 c.l Rich strike. R.M.News. Jan. 1, 1882 p.7 c.4 History; ore. R.M.News. Jan. 5, 1882 p.6 c.l Rich strike; history. R.M.News. Jan. 10, 1882 p.3 c.l Mentioned, Lincoln. R.Y.News. Apr. 23, 1883 p.3 c.l Nuggets. R.M.News. May 21, 1883 p.2 c.l Mentioned. R.M.News. Aug. 10, 1883 p.3 c.3 Production. R.M.News. July 18, 1884 p.2 c.2 Activities near Mount Guyot. R.M.N,2Ls. Aug. 8, 1884 p.6 c.l
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