The issue is similar to a dispute between Oil and Natural Gas Corporation and Reliance Industries over the latter drawing gas from the state-run company's block
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/essar-under-watch-over-illegal-coal-bed-methane-extraction-west-bengal
[2] http://admin.indiaenvironmentportal.org.in/category/author/shine-jacob
[3] http://admin.indiaenvironmentportal.org.in/category/newspaper/business-standard-new-delhi
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/west-bengal
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/mining
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/oil-and-natural-gas-corporation-ongc
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/methane
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/coal