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- Concentration of manganese ores from Gila, Greenlee, and Graham counties, Ariz.
- Concentration of Colorado fluorite ores
- Concentration of oxide manganese ore from Sheep Mountain property, Durkee district, Oreg.
- Beneficiation of oxide and carbonate manganese ores from the Philipsburg District, Granite County, Mont.
- Concentration of oxide manganese ores from the Havasu Lake District, California and Arizona
- Concentration of copper-cobalt ores from the Blackbird District, Lemhi County, Idaho