Links:
[1] http://admin.indiaenvironmentportal.org.in/news/why-treat-iron-ore-differently-coal
[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/minerals
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/coal-bearing-areas-act-1957
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/coal