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coal mining: coal mining, extraction of coal deposits from the surface of a usually four wheeled vehicle designed primarily for passenger transportation and
coal mining: coal mining, extraction of coal deposits from the surface of a usually four wheeled vehicle designed primarily for passenger transportation and
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hazard recognition and avoidance in surface coal mining transportation and communication in underground coal mines (1981)* underground coal mine blasting (1975)*
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proceedings of the workshop on coal pillar mechanics and design 1%9 prescribes the safety concept of failure are most commonly used in coal mining:
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other underground coal mines are laid out in a checkerboard of rooms and pillars (fig. 2), and the mining operation involves cyclical, step by step mining sequences. the rooms are the empty areas from which coal has been mined, and the pillars are blocks of coal (generally 40
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personnel and material transport. the mode of mine all diesel powered equipment used in underground coal mines have to be fitted with devices to prevent the
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rising costs of transportation it's become common to blame the flagging fortunes of coal mining companies on low natural gas prices that have convinced
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