Russian mathematicians and geophysicists have developed a way to improve the efficiency of the electromagnetic exploration method (CSEM) for gold and other ores.
This method involves injecting an oscillating electric current into the ground through grounded electrodes for subsequent measurement of the electromagnetic field at the surface. Its distribution depends on the distribution of electrical conductivity under the site, which makes it possible to identify areas associated with the accumulation of metal-bearing ore. Despite the need to deploy a complex of electrical equipment, the main problem is the complexity of the analysis of the data obtained..
However, a group of scientists from Skolkovo, Moscow Institute of Physics and Technology, St. Petersburg State University and the University of Utah have developed a numerical method that significantly reduces the amount of computations required, making the problem solvable on modern supercomputers..
Proposed the algorithm was tested at one of the largest gold deposits in the world – Sukhoi Log in the Irkutsk Region. Despite the huge deposits, due to the low concentration of gold in the rock, its search is very difficult. Results compared with the data of Soviet geologists who drilled about 800 wells at one time.
According to the team, the 6x4x2 kilometer volumetric image of the geological environment created was of high quality and more accurate than any made using direct current. Until now, no one has solved inverse CSEM problems of this size..
This information allows you to get by with a minimum of exploration wells to verify the calculated data, which significantly reduces costs and research time..
The developed method is fully applicable not only for the analysis of gold deposits, but also copper-nickel, copper-pyrite and polymetallic.
Scientists recently accidentally discovered even simpler method prospecting for gold deposits. A team of physicists has developed compact underground detector that uses cosmic radiation to create «x-ray» deposits precious metal under the surface.
text: Ilya Bauer, photo: Skoltech, 2.bp.blogspot, biznes-gazeta
Orogenic Gold Deposits