Tender for Drilling Of 4 Nos Nx Size Coring Vertical Boreholes From Surface To Sripur (r-vi) Seam For Exploration Of Coal Seam, Calculation Of Coal And Ob Quantity And Grade Of Coal For Extension Of Ssi (ningha) Oc Patch Under Ningha Group Of Mines, Satgram-sripur Area. in Multi City - Multi State

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