Mines and mineral resources. Colorado Estimated gold yield; gold sent N.Y. assay office, 1862. new york R.M. News. May 8, 1863 p.2 c.2 Incorrect statement, mining, Mining Register, Williams. R.M. News. June 3, 1863 p.2 c.3 Article, Keith process described, Calif. min. & scientif journal. R.Pd. News. July 2, 1863 p.2 c.1 History, Gold min. of Colo. swindle. R.M. News. Sept. 2, 1863 p.2 c.1 Article, Pet vs. Dry quartz crushing. R.M. News. Sept. 9, 1865 p.2 c.2
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