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Coal Mining Technologies. Coal mining employs surface and underground methods to extract coal. A number of alternative technologies are associated with each method.
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Coal mining in India began in 1774 when John Sumner and Suetonius Grant Heatly of the East India Company commenced commercial exploitation in the Raniganj Coalfield ...
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coal mining methods in india - Mine Equipments. Coal mining - Wikipedia, the free encyclopedia A coal mine in Bihar, India... The choice of mining method depends ...