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Methods and costs of sinking Bunker Hill and Sullivan Mining and Concentrating Company’s Crescent shaft
AuthorOlds, Edward B
Mining and Metallurgical Engineering
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This paper describes the methods and costs of deepening the Crescent three-compartment shaft from the 1,275 foot level to the 3,275 foot level. A noteworthy rate of advance was achieved by the use of mechanical mucking and an intermediate dump.
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