GSI has built a national geoscience database in the form of 1:50,000 / 63,360 geological maps covering almost the entire country. Data is available in the form of Maps and
Reports
Geological Maps are published at different scales to suit user’s needs. These maps are being refined with change in concepts and acquisition of new data. Apart from published maps on smaller scales, ammonia prints of unpublished 1:50,000/63,360 geological maps are made available on request at a nominal cost.
Second generation mapping in 1:25,000 scale being taken up in selected sectors for concept oriented mineral targeting or to resolve specific geological problems.
Services Available
Expertise in mapping in any terrain, at any required scale with details necessary to suit users’ needs.
Peninsular and Shield areas
Himalayan Terrain
Deccan Traps
Quaternary Terrain
Thematic mapping
Air Borne Geophysical Surveys
The Department of Airborne Mineral surveys & Exploration (AMSE) was set up by the Govt. of India in 1965 at New Delhi with the objective of utilizing airborne geophysics in mineral resource exploration programmes and to nurture and develop indigenous professional expertise in this domain. The Department was merged with the Geological survey of India in September 1970 as a specialized Wing. The airborne surveys are carried out employing the Twin Otter Airborne Survey System (TOASS) housing different types of geophysical (magnetic, electromagnetic and radiometric) sensors at low or high altitudes along predetermined flight paths. Over the past thirty years, the AMSE Wing of GSI has acquired expertise in all aspects of planning and execution of multisensor airborne geophysical surveys for exploration and other purposes.
The TOASS has been upgraded in March 2000 through incorporation of magnetic and spectrometric sensors, data processing and ground proximity warning systems. Supporting this is the Geophysical Mapping Centre (GMC) equipped with state-of-the-art infrastructure for processing data and generating different data products like contour maps, profiles, imagery, etc.
The five zonal offices of AMSE Wing located at Hyderabad, Nagpur, Jaipur, Ranchi and Shillong constitute the backbone of the AMSE Wing carrying out ground evaluation of anomalies delineated through aerogeophysical surveys. The work carried out by these zonal offices over the last three decades has resulted in identification of new mineral prospects.
The AMSE Wing has also established state of the art laboratories for petrological, chemical and geophysical processing techniques and extends these facilities to other Regions and specialised wings of GSI as well as to different Indian universities.
It has carried out aero-magnetic and multi sensor surveys over an area of 1978142 km2 in
selected blocks in India.
It had successfully catered to the needs of the user agencies like Oil and Natural Gas Commission, Oil India Limited, Nuclear Power Corporation (India) by carrying out aero-magnetic and multi-sensor surveys.
Services Available
High resolution magneto-spectrometric surveys at low altitudes and close line intervals
Aerogeophysical Surveys (EM, MAG and Radiometric)
Aerogeophysical Data processing and generation of Data Products (contour maps, profiles, imagery etc.)
Aerogeophysical Data Interpretation in conjunction with geological database, including feedbacks from aerial photo and satellite imagery interpretation.
Follow up Surveys over identified anomalous zones by ground geological, geophysical and geochemical studies.
Evaluation of positive targets by detailed exploration, including drilling.
Petrographic and Minerographic studies.
Minor and trace element analysis, including Gold and PGE.
Whole rock analysis, Stable Isotope Geochemistry and Fluid Inclusion Geochemistry.
Bench scale ore beneficiation tests.
Dissemination through sale of aerogeophysical data products, scientific reports and publications.
Ground Geophysical Studies
GSI has an experience of five decades in gravity, magnetic, IP-Resistivity, electromagnetic, shallow seismic and bore-hole logging as an aid to mineral exploration, especially towards identification of sub-surface structures. GSI also conducts ground geophysical studies for studies on urban development, namely, search for ground water, detection of saline water, identification of waste disposal areas, sewerage etc.
Glacial mass balance studies, Archaeology, natural hazard studies such as Earthquake precursor, land subsidence and void identification form a significant part of GSI’s geophysical expertise.
GSI Has an array of geophysical survey equipment and experienced professionals in all the six Regional centres and in the Central Headquarters.
Disclaimer: Endeavour has been made to make available updated, correct and accurate information. The errors, if any, whenever brought to notice will be rectified. But, the Ministry/Department will accept no responsibility and liability, of whatever nature, for the correctness of the material on website. In this regard, the users are advised to verify, in their own interest, the correctness of the facts from the concerned official or person.
