Sylvanite mine. CRESTED Butte COLORADO Operating; machinery installed, Copper crook. R. M. News. Dec. 10, 1880 p.2 c.2 Xork resumed. R.M. News. Oct. 11, 1883 p.7 0.3 Output; estimated ore- value, 1884 R.M. News. Jan. 9, PA c.1
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