Estimation of gold reserve in Tumakuru district, Karnataka

DOI

10.2991/msc-18.2018.20How to use a DOI?

Keywords

Gold, litho-logging, Pre-Cambrian Dharwar Craton, reserve estimation method

Abstract

Economic value of a country greatly depends on the mineral reserves. India holds the 10th position of gold reserve in the world. It has a large amount of gold reserve in the Pre-Cambrian Dharwar Cratons of the Peninsular India. The study areas lies between latitudes 13°43’0” to 13°43’35”N and longitudes 76°42’55” to 76°43’15”E of Tumakuru district of Karnataka, named as GSI (Geological Society of India) Block–F. Gold mineralization is localized within the nose of a large, northerly plunging anticline of a sulphide bearing BIF (banded iron formation) horizon. The main BIF band is over 10 m thick and is folded into an anticline with a wavelength of over 300 with second order fold (520) near the hinge area. The BIF are overlain by the phyllites (often carbonaceous and pyritic) and greywacke and underlain by meta-andesite and pillow meta-basalt. Quartz veins occur within extensional fractures as sigmoidal gash veins in BIF’s. Thin alteration zone developed along the contact of the primary chert and iron oxide layers that served as fluids channel ways. Alteration is characterized by chlorite, quartz, calcite, ankerite, sericite, stilpnomelane, pyrrotite, arsenopyrite, pyrite, chalcopyrite, sphalerite and gold replacing and continually grading into layers of weaker iron oxide layers. Litho-logging is done from four borehole, and core samples are used for reserve calculation using reserve estimation calculation method. Cut-off grade for gold is 0.5 g/tonne. Reserve estimation was done in Block–F within two prominent mineralized zone named as MZ-1 and MZ-2. Based on observation and calculation, the study area contained a high grade quality and economically productive amount of gold reserve.

Copyright

© 2018, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Zairemmawii
PY  - 2018/12
DA  - 2018/12
TI  - Estimation of gold reserve in Tumakuru district, Karnataka
BT  - Proceedings of the Mizoram Science Congress 2018 (MSC 2018) - Perspective and Trends in the Development of Science Education and Research
PB  - Atlantis Press
SP  - 123
EP  - 131
SN  - 2352-5401
UR  - https://doi.org/10.2991/msc-18.2018.20
DO  - 10.2991/msc-18.2018.20
ID  - 2018/12
ER  -