a. In anthracite and bituminous coal mining, one who operates electric or compressed-air machines to drill holes into the working face of coal or rock for blasting, and shovels coal into cars after blasting. A contract miner is usually engaged in production work, i.e., the mining of coal only, and is paid on a tonnage basis. In anthracite regions, the miner is paid the wage rate of a consideration mine when encountering obstructions of rock or slate that prevent earning an amount in excess of a fixed or specified rate per day. Also called contract driller; contract drilling-machine operator; contract contractor. DOT
b. In metal mining, one who drills, blasts, and loads ore or rock into cars in a mine. Is usually engaged in production work, i.e., the mining of ore only, and is paid on a contract basis (so much per ton, cubic yard, or cars of ore produced). DOT
Source:
Dictionary of Mining, Mineral, and Related Terms












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