Copper-Gold Mineralisation at Dhanibasri, Dausa District, Rajasthan

The Dhambasn Cu-Au prospect Dausa district, Northeastern Rajasthan, is the only auriferous copper deposit in the country after the KGF, which is hosted within the basement granite gneisses of the Mangalwar complex of Archaean age. The epigenetic mineralization is associated with the secondary quartz veins along the brittle ductile shear zone that are reactivated during post mineralisation deformational episodes. The fact that the Dhambasn shear passes and cuts through the much younger Raialo and Alwar group of rocks exposed north of the prospect is indicative of its reactivation. The detailed petro-Minerography and sulphur isotope studies suggest a poly phase mineralisation in terms of an early phase demarcated by pyrite rich mineralisation followed by main copper-Gold deposition during advance stage of mineralisation. This paper presents detailed geology, petrography, fluid inclusion and sulphur isotope data of Dhambasn prospect to classify the fluid type and mode of emplacement of copper-Gold mineralisation.