Gold mineralization at G. R. Halli is located along the Central shear zone of Chitradurga schist belt, extending from west of Gonur, through east of G. R. Halli and C. K. Halli to east of Honnemardi, roughly parallel to stratigraphic units. The NNW-SSE trending shear zone has a width of 0.5 to 1.5 km shows extensive carbonatization of metabasalts and the associated lithologies confined to NNW-WNW trending arcuate brittle-ductile zone. The sheared and silicified contact zones between carbonaceous argillite and schistose metabasalt form the potential sites for localization of mineralization. The gold is associated with sulphides mainly pyrite, arsenopyrite, galena, sphalerite, minor chalcopyrite. Textural relationship indicates two stage sulphide mineral assemblages co-relatable with two stage fluid ascents having temperature of homogenization between 125°C and 256°C. It is a typical epigenetic lode gold system, which got affected by later deformation.
Sheshadri, T.S. and Mallikarjuna, C. (1979) Progress Reports on Pilot Drilling for Base Metals and gold In G. R. Halli Section, Chitradurga Sulphide Belt, Chitradurga District, Mysore State. Unpublished Report of GSI for FS 1969-71.
Rajendran, N. (1992) A Report on the Investigation for Gold in G. R. Halli—C. K. Halli, Honnumardi Areas, Chitradurga Schist Belt, Chitradurga District, Karnataka. Unpublished Report of GSI for FS 1989-90 and 1990-91.
Ananthanarayan, R. (2008) A Comparative Study on the Genetic Aspects of Gold Deposits of Karnataka (Gadag, Ajjanahalli, Chitradurga, Chinmalagund, Kempinkote and Kolar) through Fluid Inclusion Studies. Records of the Geological Survey of India, 140, 67-68.
Khan, S.A. (2001) Gold Mineralization along Gonur-Jagalur Shear Corridor in Central Part of the Chitradurga Schist Belt, Karnataka. In: National Seminar on Exploration and Survey for Noble Metals and Precious Stones, Geological Survey of India Special Publication, Hyderabad, No.58, 251-261.
Gupta, S., Jayananda, M. and Fareeduddin (2014) Tourmaline from the Archean G. R. Halli Gold Deposit, Chitradurga Greenstone Belt, Dharwar Craton (India): Implications for the Gold Metallogeny. Geoscience Frontiers, 5, 877-892.
Bodnar, R.J. (1983) A Method of Calculating Fluid-Inclusion Volumes Based on Vapor Bubble Diameters and P-V-T-X Properties of Inclusion Fluids. Economic Geology, 78, 535-542. https://doi.org/10.2113/gsecongeo.78.3.535
Zhang, Y.G. and Frantz, J.D. (1987) Determination of the Homogenisation Temperatures and Densities of Superficial Fluids in the System NaCl-KCl-CaCl2-H2O Using Synthetic Fluids Inclusions. Chemical Geology, 64, 335-345.
Brown, P.E. and Lamb, W.M. (1988) P-V-T Properties of Fluids in the System H2O-CO2-NaCl: New Graphical Presentation and Implications for Fluid Inclusion Studies. Geochimica et Cosmochimica Acta, 53, 1209-1221.
Swanenberg, H.E.C. (1979) Phase Equilibria in Carbonic Systems and Their Applications to Freezing Studies of Fluid Inclusions. Contributions to Mineralogy and Petrology, 68, 303-306. https://doi.org/10.1007/BF00371552
Sarangi, S., Sarkar, A., Srinivasan, R. and Patel, S.C. (2012) Carbon Isotope Studies of Auriferous Quartz Carbonate Veins from Two Orogenic Gold Deposits from the Neo-Archean Chitradurga Schist Belt, Dharwar Craton, India: Evidence for Mantle: Magmatic Source of Auriferous Fluid. Journal of Asian Earth Sciences, 52, 1-11.