Project/Year

Coverage L.Km/Sq. Km

Operation Hard Rocks/1967-68

1,44,462/90,395

Multisensor surveys in parts of A.P., Bihar, Rajasthan and West Bengal

BRGM/CGG/1971-72

1,43,507/76,460

Multisensor surveys in parts of Gujarat, Karnataka, M.P., Maharashtra and Rajasthan

NSL Project/1978-79

37,338/90,924

Aeromagnetic survey by NGRI for GSI in parts of Bihar, Gujarat, M.P., Maharashtra and U.P.

Op. Anantapur/1979-81

33,040/29,300

Aeromagnetic survey by NGRI for GSI in parts of A.P. and Karnataka

Op. Cuddapah/1981-82

24,630/22,760

Aeromagnetic survey by NGRI for GSI in parts of A.P.

National Aeromagnetic Survey Mission/1980-95

3,73,189/13,68,894

High altitude aeromagnetic survey by NRSA for GSI in the area south of 24° N latitude, excluding Deccan Trap area

1986 onwards

45,542/1,19,224

Aeromagnetic survey(***) in parts of Assam, Bihar, Manipur, Meghalaya, Mizoram, Nagaland, U.P, Tripura, West Bengal and foothills of Himalayas

2,37,895/1,15,818

Multisensor surveys in parts of A.P., Haryana, Karnataka, M.P., Maharashtra, Orissa, Rajasthan and Tamilnadu