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- Concentration of Colorado fluorite ores
- Concentration of oxide manganese ores from the vicinity of Death Valley National Monument, California
- Concentration of oxide manganese ores from Black Rock, Kramer, and Morgan-Cromar properties, Tooele and Juab Counties, Utah
- Beneficiation of oxide manganese and manganese-silver ores from southern Arizona,
- Pikes Peak iron deposits Maricopa County, Ariz.