Coal India Ltd (CIL), which meets about 80% of the country
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/underground-mining-not-feasible-india
[2] http://admin.indiaenvironmentportal.org.in/category/author/subhash-narayan
[3] http://admin.indiaenvironmentportal.org.in/category/author/noor-mohammad
[4] http://admin.indiaenvironmentportal.org.in/category/newspaper/financial-express
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/coal-india
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/forests
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/industry
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/ministry-environment-and-forests-moef
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/australia
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/indonesia
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/united-states-america-us
[12] http://admin.indiaenvironmentportal.org.in/category/thesaurus/environment