The Centre plans to permit sale of 50 per cent of coal/lignite produced by captive blocks, a move aimed at augmenting the production and increasing the availability of dry fuel. The government plans to do so through incorporation of a provision in the Mines and Minerals (Development and Regulation) Act, 1957 (MMDR). "In the note for consultation of Ministry of Mines, it is proposed to incorporate a provision in the Act to allow sale of 50 per cent of coal/lignite produced by captive mines on an annual basis. Further, an additional amount will be charged on the merchant sales of coal/lignite by the captive miners," the coal ministry said in brief note.