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Verlag: U. S. Bureau of Mines, Washington, D.C., 1975
Zustand: near fine. 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. stapled binding, 10.5" Tall, cover small red stamp top right corner, 47 pages, pages clean.