Porcupine group mined, Pitkin COLORADO Claims adjoining; list. R.M.News. Nov. 20, 1883 p.2 c.3 Estimated production 8e value. R.M.News. Mar. 13, 1883 p.3 c.2 Mines; list. R.M.News. Dec. ?4, 1883 p.7 c,3 Mentioned, R.U.News. Oct. 14, 1884 p'.6 c.3 Mentioned. R.M.News. Mar. 10, 1883 p.? c.3 Rich ore; PROPOSED concentrator. R.M.News. Dec. ?5, 1883 p.7 c.1
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