Mining leases are granted by the State Governments.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/environmental-clearances-mining-psu
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/business-standard-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/thesaurus/environment-clearance-ec
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/mining
[5] http://admin.indiaenvironmentportal.org.in/thesaurus/state-environment-impact-assessment-authority-seiaa
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/environment-management
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/environment-act-1986
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/ministry-environment-and-forests-moef
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/environment