Author Archives: geoamit

Q: What is the role of CO2 fugacity in trapping Au in magma and hydrothermal fluids?

There are many school of thoughts prevailing in the role of CO2 playing in the formation of gold bearing ores. As on today there is a heavy gold rush, it has become very important to know the present day scenario on the genesis of formation of gold and associated metals and the various possibilities of locatingContinue reading “Q: What is the role of CO2 fugacity in trapping Au in magma and hydrothermal fluids?”

Q: What type of pegmatites can be good host for Nb, Ta and Uranium? Whether such pegmatites are originated by magmatic differentiation or hydrothermal processes? In what type of terrain such pegmatites are found? Which age of pegmatite is most favorable for uranium?

Question asked by a researcher from Madagascar

Meet Charles Devenish – Explorer and Global Wanderer

After the Second World War, Charles Devenish set out on foot from France and Walked all the way to Kolkata!! He fell in love with India and kept of returning many many times before finally settling in Bangalore in 1994. He founded India’s first Exploration Companies Deccan Gold and Geomysore Services. In this video interviewContinue reading “Meet Charles Devenish – Explorer and Global Wanderer”

Opinion- by Sri Pramod Kumar, fmr Addl Director, AMD: on “Mineral System” based classification of deposits

The most challenging question in exploration is “why an element is there where it is?” Hence to synthesize the whole gamut of concept of  mineral deposits, its possible origin, type, classification and association with other minerals is a good idea over the routine space and time concept. All deposits are unique in nature and theContinue reading “Opinion- by Sri Pramod Kumar, fmr Addl Director, AMD: on “Mineral System” based classification of deposits”

Opinion – by Dr. V. Ganesan, fmr Director, GSI: on “Mineral System” based deposit classification for earth mapping resources

Relationship exists between mineral systems/ore deposits, principal commodities and critical minerals. Very good illustration have been made in clear cut pictures explaining the various tectonic domain wherein what type of deposits are formed. By repeated explanations with world / Indian  examples have to be given to the Geologists community by showing the models where oneContinue reading “Opinion – by Dr. V. Ganesan, fmr Director, GSI: on “Mineral System” based deposit classification for earth mapping resources”

Q: What happens when we exploit all the mineral resources? What happens when deposits around the world start depleting?

Simple answer is yes and no. Mineral resources are finite, however, the resource pool is so vast that it tends to feel like infinite. Reserves are finite at FIXED level of price; FIXED level of input cost, FIXED level of technology, and a fixed level of SOCIETAL demand. Since all these components are continuously changing,Continue reading “Q: What happens when we exploit all the mineral resources? What happens when deposits around the world start depleting?”

Q: What are the signatures on surface, of a hidden copper-gold mineral resource, and which type of terrain should be looked into for it?

Answer: By A. Sundaramoorthy, former Director General, GSI For copper the surface manifestation is development green or bluish green malachite stains and gossan, example Rajpura Dhariba, Rajasthan. For gold associated with other sulphides it is development of yellowish stains and development of gossan with boxwork. If gold occur in native form like Kolar Gold fieldContinue reading “Q: What are the signatures on surface, of a hidden copper-gold mineral resource, and which type of terrain should be looked into for it?”