Explorer 108 is located 35kms to the west of Rover 1 and drilling to date has defined a lead-zinc discovery with an initial polymetallic resource of 11.8Mt @ 3.24% Zn, 2.00% Pb and 11.1/t Ag. In addition, a separate Indicated resource of 5.7Mt of 0.36% Cu as a blanket has been defined. Castile’s geological model for Explorer 108 prospect is a Mt Isa analogue given the numerous geochemical and structural similarities between the two. The primary copper system is yet to be defined. A review of previously captured, downhole electromagnetic geophysics surveys has identified two subtle but significant off-hole conductive anomalies. These will be the subject of resurveys using modern equipment to determine a vector to the source for further drill testing.