Geological Survey of India
- GSI was set up in 1851 primarily to find coal deposits for the Railways.
- Headquartered in Kolkata, it has six regional offices located in Lucknow, Jaipur, Nagpur, Hyderabad, Shillong and Kolkata.
- It is an attached office of the Ministry of Mines.
- It creates and updates the national geoscientific information and mineral resource assessment.
- It also documents the surface and subsurface geological processes of India and its offshore areas.
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