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Concentration of manganese ores from Grand and Emery Counties, Utah
Concentration of gravity tailings from the Grasselli deposit, Park City, Utah
Beneficiation of oxide tin ores from the states of Zacatecas and Guanajuato, Mexico
Concentration of oxide manganese ores from the Aguila district, Arizona
Concentration of copper-cobalt ores from the Blackbird District, Lemhi County, Idaho
Concentration of oxide manganese ores from Lander County, Nev.