Coal India's Gevra mine will become the world's top coal-producing mine next year by achieving the output of 63 million tonnes, surpassing the US mines, a top official said on Sunday. Gevra mine, operated by South Eastern Coalfields Ltd (SECL), a subsidiary of Coal India, is India's largest opencast coal mine. Operational since 1981, the Gevra mine will produce 56 million tonnes this year. The mine has already received the environmental clearance to expand capacity to 70 million tonnes per annum. In an interview with PTI here, SECL CMD Harish Duhan said, "By next year, only Gevra mine will be producing 63 MT and will become the number one mine in the world." Black Thunder Mine in Wyoming's Powder River Basin in the US is the world's largest coal mine with an output of 61-62 million tonnes, followed by North Antelope Rochelle Mine. SECL is fully prepared to achieve a production target of 56 million tonnes from Gevra acknowledged as India's largest coal mine this financial year, t