Regulation) Act, 1957 (MMDR Act). Section 15 of the MMDR Act empowers State Governments to make rules for regulating the grant of mineral concessions in respect of minor minerals and for purposes connected therewith. The regulation of grant of mineral concessions for minor minerals is, therefore, within the legislative and administrative domain of the state governments. Under the power granted to them by section 15 of the MMDR Act, State Governments have framed their own minor minerals concession rules. Section 23C of the MMDR Act, 1957 empowers State Governments to frame rules to prevent illegal mining, transportation and storage of mineral sand for purposes connected therewith. Control of illegal mining is, therefore, under the legislative and administrative jurisdiction of State governments. The Government of Tamilnadu issued a G.O Ms. No. 21 dated 02.06.2017, wherein it was directed that the PWD may approach SEIAA on case-to-case basis to permit more number of poclains for Sand quarries. The Executive Engineer, PWD/WRD had submitted a proposal for the issue of amendment for usage of more machines in the EC issued for the sand quarrying in River Cauvery over an extent of 16.18.0 ha at S.F.No.643/1(P), Oruvanthoor Village, Namakkal Taluk, Namakkal District, Tamil Nadu. The PWD also submitted a report covering the ecological aspects in this regard. Considering the same, the Committee formulated the following criteria in deciding the number of poclains: