The Mirko occurrence area is underlain by a structurally complex assemblage of various Upper Triassic sedimentary and volcanic rocks that have been intruded by Juro-Cretaceous diorite and an array of Tertiary-Cretaceous felsites and porphyritic dykes. The sediments consist of conglomerates, sandstones, shale, limestone and minor carbonate breccia. Intermediate to mafic volcanics are comprised of tuffs, lithic tuffs which have been hornfelsed locally.

Mapping in 2008 in the Mirko area identified a strongly carbonate-altered fine to very fine-grained intermediate to mafic volcaniclastic rock with trace to 5 per cenet very fine-grained molybdenite. Drilling at Mirko’s Knob was targeted at molybdenum-gold-copper soil geochemical anomalies and moderate chargeability, in an area of little outcrop. The best Mirko intersection was 13 metres of 0.18 gram per tonne gold, 0.12 per cent copper and 0.04 per cent molybdenum in hole GRZ08-09 (Assessment Report 30723). This mineralization is associated with carbonate breccia and veins, potentially the same fluids responsible for local pyrite lenses associated with the Forrest-Kerr Fault.

See Grizzly (104G 079) for related details and RDN (104G 144) for related work history.