Mines and mineral resources. Colorado. Gold Hill district Production; mills; list; Horsfal mine yield by arastra. R.M. News. Sept.14, 1860 p.2 c.3 Mill activities, Boulder Diggings; gold saver. R.M. News. Sept.19, 1860 p.2 c.1 Difficulity in opening lodes; activities, mills; Horsfal lode. R.M. News. Dec. 21, 1860 p.3 c.1 Prize letter, Boulder mines. R.M. News. Dec. 29, 1860 p.3 c.1 Union co. mill work; Holly & Holt mill; lodes; list. R.M. News. Feb. 16, 1861 p.2 c.3
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