Geological Survey of India (GSI) -One of the oldest surveys in the World is a premier organisation of Earth Science Studies in the sub-continent with a strength of 2100 geoscientists and technical professionals. GSI has a network of offices located in all the states of India.
Links:
[1] http://admin.indiaenvironmentportal.org.in/organisation/geological-survey-india
[2] http://www.gsi.gov.in/
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/mining
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/mining-research
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/geology
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/west-bengal
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/calcutta-d