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Open Cast In Coal Mining In Andhra Pradesh

History of coal mines in andhra pradeshil is the largest coal producing company in the world it produced 53651 mt million tonne coal during fy201516 coal india operates through 81 mining areas in eight states in india as on 1 april 2015 it has 430 coal mines out of which 175 are open cast 227 are underground and 28 are mixed mines.