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4 results found
One of a group of copper ores and other specimens illustrating the extraction of the metal - a sample of sulphide ore from various mines tributary to Chase Creek, for No. 4 Sulphide Mill, Clifton
One of a group of copper ores and other specimens illustrating the extraction of the metal - a sample of sulphide ore from the Humboldt Group and other mines tributary, for No. 6 Mill at Morenci
One of a group of copper ores and other specimens illustrating the extraction of the metal - a sample of sulphide ore, average smelting grade, from Coronado Mine
One of a group of copper ores and other specimens illustrating the extraction of the metal - a sample of sulphide ore, average smelting grade, from Longfellow Mines