The Mines and Minerals (Regulation and Development) Act, 1957 (MMDR Act 1957 in short) was enacted so as to provide for the regulation of mines and development of minerals under the control of the Union. The Act has been amended in 1972, 1986, 1994 and 1999 in keeping with changes in the policy on mineral development. The Mines and Minerals (Regulation and Development) Amendment Act, 1999, inter-alia, provides for (a) introduction of a new concept of reconnaissance operations distinct from prospecting; (b) delegation of powers to the State Governments to grant mineral concessions for limestone; (c) granting of mineral concession in non- compact and non-contiguous areas; (d) liberalizing the maximum area limits for prospecting licences and mining leases; (e) empowering the State Governments to make rules to curb the illegal mining etc.