The Warrawoona Project leases lie within the Warrawoona Group, one of the oldest greenstone belts within the Pilbara Craton. Composed largely of high-Mg basaltic lavas with lesser tholeiite, andesite, sodic dacite, potassic rhyolite, chert and banded iron formation (BIF), all metamorphosed to greenschist facies, the Warrawoona Group is sandwiched between the Mount Edgar batholith to the north and the Corunna Downs batholith to the south.

Gold occursin quartz veins and stringersin the Klondyke, Copenhagen and Fieldings Gully Shears and mineralisation is associated with quartz-carbonate-sericite-pyrite alteration. Quartz veins and stringers are generally approximately parallel to the predominant shear direction. The bulk of the gold mineralisation is hosted in strongly sericitised and sheared mafic units with thin chert bands marking probable stratigraphic breaks.

Over some abandoned workings gold mineralisation is associated with copper as indicated by the presence of malachite and other copper carbonates.

The Warrawoona Project is located within the East Pilbara Terrane of the Archean Pilbara Craton in Western Australia. The East Pilbara Terrane is characterised by large, dome-shaped composite granitic complexes wrapped by greenstone belts. The granite-greenstone terrane is unconformably overlain by little-deformed volcanic and sedimentary rocks of the Hamersley Province. The Klondyke deposit is hosted within the Warrawoona Group, a package o ........

Calidus has undertaken a conventional approach to the development of open pit and underground mine designs and schedules supporting this Feasibility Study. Resource models, key assumptions and inputs were provided to external consultants (Intermine Engineering Consultants for open pit studies, and Entech Pty Ltd for underground studies).

Intermine and Entech interrogated the block models generated by Optiro (Klondyke & St George Open Pit), Widenbar & Associates (Klondyke Underground) and Calidus (Copenhagen, Fielding’s Gully) undertaking detailed financial analysis utilising Whittle and Deswik MSO software for open pit and underground mining respectively.

A competitive tender process was undertaken for the Open Pit mining contract. Macmahon Holdings Limited (Macmahan) were awarded the preferred tender status for open pit mining (ASX release 17th September 2020 Construction underway at Warrawoona Gold Project).

Early contract engagement with Macmahon has given Macmahon the opportunity to have input into the final open pit mining schedule for the Feasibility Study. Mining rates used in the Feasibility Study are the tendered rates from Macmahon.

Given that the underground does not commence until Year 3 of the Project, the underground schedule was provided to underground mining contractors with a request to provide budget pricing. Macmahon underground rates were also utilised for the Feasibility Study.

Open Pit
The K ........

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