The primary agency responsible for geological surveys and mineral exploration in Manipur is the:

Geological Survey of India (GSI)
Directorate of Geology and Mining, Manipur
Central Mine Planning and Design Institute
Private mining companies

The correct answer is: Geological Survey of India (GSI).

The Geological Survey of India (GSI) is a government agency under the Ministry of Mines and Steel of the Government of India. It is responsible for geological surveys and mineral exploration in India. The GSI was established in 1851 and is headquartered in Kolkata. It has a network of offices and laboratories across India.

The Directorate of Geology and Mining, Manipur is a government agency under the Department of Mines and Geology, Government of Manipur. It is responsible for the administration of the mining and geology sector in Manipur. The Directorate was established in 1972 and is headquartered in Imphal.

The Central Mine Planning and Design Institute (CMPDI) is a government agency under the Ministry of Coal of the Government of India. It is responsible for mine planning, design, and development. The CMPDI was established in 1965 and is headquartered in Ranchi.

Private mining companies are companies that are engaged in the mining of minerals. They are responsible for the exploration, development, and production of minerals. Private mining companies are regulated by the government.

The Geological Survey of India (GSI) is the primary agency responsible for geological surveys and mineral exploration in Manipur. The GSI has a long history of conducting geological surveys and mineral exploration in Manipur. The GSI has published a number of reports on the geology and mineral resources of Manipur. The GSI also provides technical assistance to the government of Manipur in the development of its mineral resources.