Geological Survey of India (GSI):
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The GSI is a government organisation in India, attached to the Ministry of Mines for conducting geological surveys and studies.
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It is one of the premier organisations of earth science survey and research in the world.
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The GSI was established in 1851 and is one of the oldest of such organisations in the world and the second oldest survey institution in the country.
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It is the prime provider of basic earth science information to the government, industry and the general public.
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Its main function is related to creation and updation of national geoscientific information and mineral resource assessment.