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Concentration of Colorado fluorite ores
Concentration of fluorite ores from Arizona, California, Idaho, Montana, Nevada, and Wyoming
Concentration of Utah fluorite ores
Concentration of gravity tailings from the Grasselli deposit, Park City, Utah
Beneficiation of Chromite Ores From Western United States
Concentration of manganese ores from Boulder Dam Recreational Area, Clark County, Nev.
Operations of manganese-ore-purchasing depots at Deming, N. Mex., and Wenden, Ariz.