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_:vb7271021
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Considerable copper ore, steam-shoveled from Sacramento Hill and piled at Bisbee, was of smelting and milling grade, and some of it was put on the dump for heap leaching.
dcterms:bibliographicCitation
1922 November 28, V. C. Heikes, “Gold, Silver, Copper, Lead, and Zinc in Arizona”, in Mineral Resources of the United States 1921, part I (Metals), Washington, D.C.: [United States Geological Survey, Department of the Interior]; Government Printing Office, published 1924, →OCLC, page 321: