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Kaiser Fluorspar Mine, Mineral County, Nevada, USA
Kaiser Fluorspar Mine, Broken Hills district, Mineral County, Nevada. Active 1928-57. Reference: E. J. Matson & R.R. Trengrove, "Investigation of Fluorspar Deposit, Kaiser Mine, Mineral County, Nev.", US Bureau of Mines Report of Investigations 5344, 1957. It's available online for free, but on a page-by-page basis only, from Hathitrust Digital Library (www.hathitrust.org).