First Report of Associated Gold Mineralisation in the Bansiyal Area, Sikar/Jhunjhnun District, Rajasthan, India: An IOCG Earth System of Mineralisation

Abstract

The Khetri Copper Belt is known for copper mineralisation in Rajasthan. The North Khetri is specifically rich in copper mineralisation while the south Khetri belt is marked with the small isolated deposits of copper with sharing nearly similar depositional and lithotectonic environment. One such location is Bansiyal in Sikar District, Rajasthan, where copper mineralisation is known from as early as 1994 and hosted within Ajabgarh metasediments of Delhi Supergroup of rocks. We report the occurrence of gold for the first time from the area to the tune of 74ppb, which is 7 times higher than the threshold required for (which is 10ppb, as a convention) exploration. The Gold occurrence here is associated with copper and iron. The values of Copper up to 1.3% and Fe2O3 up to 52% indicates enrichment of these elements. Other trace elements like Cr, V and Sc have also slight enrichment indicating towards the possibility of this mineralisation being an IOCG earth system of mineralisation.