Blasting Tests in a Porphyry Copper Deposit in Preparation for In Situ Extraction, Report of Investigations 8070
Washington, D.C. U. S. Bureau of Mines, 1975. stapled binding, 10.5" Tall, cover small red stamp top right corner, 47 pages, pages clean. near fine. Item #5565448
The Bureau of Mines performed a fragmentation experiment in cooperation with Duval Corporation in a porphyry copper-molybdenum deposit near the Sierrita pit south of Tucson, Ariz. This experiment evaluated the fragmentation created in a 10 hole test blast having blasthole spacings of 25, 20, and 15 feet. DR2.
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