All minerals in offshore areas, including atomic minerals, but crude oil and other hydrocarbons, are governed by the Offshore Areas Mineral (Development and Regulation) Act, 2002.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/mining-seabed-modi-govt-may-issue-50-licences-mineral-extraction
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/financial-express-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/mining
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/offshore-areas-mineral-act-2002
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/ministry-mines
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/national-institute-oceanography
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/minerals