Beyond Rover 1: two defined resources and over 100 targets.

Geological model

A Mt Isa analogue with a primary copper system to define.

Castile's working model for Explorer 108 is a Mt Isa analogue, given the numerous geochemical and structural similarities between the two systems. The primary copper system is yet to be defined.

A review of previously captured downhole electromagnetic surveys identified two subtle but significant off-hole conductive anomalies — to be re-surveyed using modern equipment for vectoring and drill testing.

Project role

Polymetallic and copper upside in one deposit.

Drilling has defined an initial polymetallic resource of 11.8 Mt at 3.24% Zn, 2.00% Pb and 11.1 g/t Ag. A separate Indicated copper resource of 5.7 Mt at 0.36% Cu sits as a blanket above the polymetallic deposit, with further untested geophysical targets still to drill.

Deposit type

Tennant Creek style Cu-Au, inferred resource defined.

Explorer 142 is a Tennant Creek style IOCG deposit with an Inferred Mineral Resource of 170 kt at 0.21 g/t Au and 5.2% Cu — 1.2 koz gold and 9.2 kt copper, reported above a 2.5% Cu cut-off.

Project role

Additional copper-gold optionality across the field.

Explorer 142 adds further copper-gold optionality to the Rover Project and supports the broader picture of multiple mineralised deposits across the field, alongside Rover 1 and Explorer 108. Beyond the three defined deposits, Castile has over 100 IOCG targets across the field and is running passive seismic surveys over them to rank drill-ready targets.