The Havieron Project is located within the north-western exposure of the Palaeo-Proterozoic to Neoproterozoic Paterson Orogen (formerly Paterson Province), 45 km east of Telfer. The Yeneena Supergroup hosts the Havieron prospect and consists of a 9km thick sequence of marine sedimentary rocks and is entirely overlain by approximately 420m of Phanerozoic sediments of the Paterson Formation and Quaternary aeolian sediments.

Gold and copper mineralisation at Havieron consist of breccia, vein and massive sulphide replacement gold and copper mineralisation typical of intrusion-related and skarn styles of mineralisation. Mineralisation is hosted by metasedimentary rocks (meta-sandstones, meta-siltstones and meta carbonate) and intrusive rocks of an undetermined age. The main mineral assemblage contains well developed pyrrhotite-chalcopyrite and pyrite sulphide mineral assemblages as breccia and vein infill, and massive sulphide lenses. The main mineralisation event is associated with amphibole carbonatebiotite-sericite-chlorite wall rock alteration. Drilling has partially defined the extents of mineralisation which are observed over 650m by 350m within an arcuate shaped mineralised zone, and to depths of up to 1400m below surface.

Variable brecciation, alteration and sulphide mineralisation are observed with a footprint with dimensions of 650m x 350m trending in a north west orientation and 1000m in vertical extent below ~420m of cover. The SE Crescent Zone Mineral Resource extents are ~550m in unfolded plan section, between 5-40m true width and ~750m in vertical extent, mineralisation remains open at depth. The Breccia Mineral Resource extents occurs as a 50-100m sleeve around the SE Crescent Mineral Resource and also a ~250x50x300 NW trending zone in the north western half on the breccia complex “Northern Breccia” which remains open at depth and to the northwest.

Mineralisation of gold and copper in the current Resource Model are within the South East (SE) Crescent and the Breccia zones. High grade gold mineralisation is associated with a massive sulphide zone termed the Crescent Zone which occurs on the margin of the Breccia zones. The Crescent Zone is characterised by a series of massive to semi-massive sulphide replacement units that have a subvertical dip and are best developed on the SE of the system forming as arcuate, crescent like geometry. The Breccias are still being defined through exploration drilling and early-stage evaluations will be completed to test the potential to develop additional mining fronts and utilise bulk mining methods.

The SE Crescent Zone is 5-40m wide, extending 550m in length in unfolded section from the basement contact and defined over 900m vertically, tapering to ~300m in length and open at that depth. The SE Crescent Zone has been the focus of drilling and has been infilled to a nominal drill spacing of 50–100m laterally (with at least part being infilled to a 50m x 50m spacing to satisfy the requirements for an Indicated Mineral Resource), and 100m vertically.

The Havieron Pre-Feasibility Study defined a SLOS mining method with paste fill and truck ore haulage at a 2Mtpa mining rate.

The Study demonstrates the potential to expand the Project and increase the mining rate to 3Mtpa or more based on the conversion of the current Inferred Mineral Resources and additional potential Mineral Resource growth from immediately below the Crescent Zone.

SLOS is a large-scale open stoping method that is conducted over multiple levels at once. Once the stope has been mined out it is backfilled with paste to maintain the overall stability of the opening and enable mining of adjacent stopes. This method is typically applied to strong orebodies that require minimal support and are surrounded by strong country rock, such as the Havieron deposit. Stopes are mined in a checkerboard fashion with all primary stopes first, followed by the intermediate secondary stopes. The mining sequence is top down overall, divided into a number of different lifts separated by horizontal sill levels which are recovered after the upper and lower level have been mined and filled.

A sub-level spacing of 50m with sill drill levels located 20m below each mining front was selected. Some sub-level spacings are increased to 60m to accommodate the inclusion of ore and minimising additional level development. The design consists of nine semi-independent mining sequences, based on both horizontal and vertical mining fronts. The horizontal fronts are determined by the orebody orientations.

The Havieron Project is a greenfield mining project and will require the following mining infrastructure to support the mine:
- decline, accesses to the levels, ore passes, ventilation raises and other underground excavations;
- paste fill plant and underground distribution system;
- ventilation fans, regulators and refrigeration equipment; and
- dewatering, electrical and other service equipment at peak production while reducing and compressing the production tail as much as practical. The production rate of ~2Mtpa for the Havieron SLOS was determined by maximising the steady state production of the sequence.

Telfer currently operates two processing trains with a total capacity of ~22Mtpa. The Havieron ore is expected to be processed through a modified Telfer Processing Plant which will operate a single train at 6Mtpa rate on a campaign basis. The Plant modifications are expected to include magnetic separation within the flotation circuit to reduce the amount of pyrrhotite in the final Cu Concentrate and a Carbon in Pulp (CIP) circuit on the flotation tail and cyanide detoxification circuit. A single train operation also provides optionality if higher mining rates are achieved from Havieron or through the extension of Telfer’s current mine life (i.e. Telfer ore can be run through the other train with the existing flowsheet). Tailings from ore processed will be deposited at the existing Telfer TSF.

Havieron underground ore will be processed on a campaign basis through the Telfer Train 2 Treatment Plant circuit at a throughput of approximately 2Mtpa. Metal recovery will be through ........