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Methods and Costs of Sinking a 2-1/2 Compartment Shaft at the Hope Mine, Clark Fork, Idaho

McHenry MosierRobert J. HundhausenHelmuth Herman SchrenkUnited States. Bureau of Mines

出版	U.S. Department of the Interior, Bureau of Mines, 1947
URL	http://books.google.com.hk/books?id=rUxY0AEACAAJ&hl=&source=gbs_api

註釋The Phelps Dodge Corp. New Cornelia Branch open-pit copper mine operated without a fatality in the drilling and blasting department from December 13, 1937, to April 1, 1947, and continuing. Between the dates named the explosives crews had a total of 746,520 man hours of exposure and handled 12,000 tons of explosives, over 770,000 detonators, 2,300,000 feet of fuse, and 7,700,000 feet of Primacord in loading holes to break 116,780,000 tons of material. It is the purpose of this paper to record the precautions taken to insure safe handling of explosives at this operation where safety is definitely a matter of forethought rather than chance.