Bidaminna is hosted in the Perth Basin, in the Guildford and Yoganup Formations on the eastern margin of the Swan Coastal Plain.

The Yoganup Formation is a buried pro-graded shoreline deposit, with dunes, beach ridge and deltaic facies. This formation lies unconformably over the Lower Cretaceous Leederville Formation and is overlain by the Pleistocene Guildford Formation and Bassendean Sand.

The Yoganup Formation consists of unconsolidated poorly sorted sands and gravels, with local interstitial clay and heavy minerals that occur sporadically along the Gingin Scarp, which is interpreted to be an ancient shoreline that was stable during a period of marine regression.

The overlying Guildford Formation consists of silty and slightly sandy clay and commonly contains lenses of fine- to coarse-grained, very poorly sorted, conglomeratic and (in places) shelly sand at its base.

Two mineralised strandlines have been interpreted using a nominal cutoff grade of 1% total HM. Lower grade mineralisation is present within the sediments of the lower horizon of the Guildford Formation and within the Yoganup Formation.

Dimensions
Two mineralised strandlines have been interpreted within the resource area that have a strike length of 6.7 km. The historical Geopeko drilling indicates that the strandline mineralisation may extend to the north for an additional 2.8 km.

The upper strandline mineralisation, towards the base of the ........

The Bidaminna Project Pre-Feasibility Study (“PFS”) proposes a dredge mining operation, as the deposit is located below the water table. However, for removal of overburden located above the water table (at approximately 54.5 mRL), the PFS proposes the conventional ‘dry mining’ method utilising a small fleet of scrapers, trucks, and excavators.

Within the top 15-25 metres of the dredging material, those materials designated as overburden or waste material are proposed to be mined with a Beaver cutter suction dredge (“Overburden Dredge”) with a 25- metre reach. The ore and mineralised waste below the overburden are proposed to be mined by a jet suction dredge (“Ore Dredge”) with capability to mine down to 60+ metres from the surface of the water.

Dredge operations and WCP processing are proposed to be undertaken in-house by Image employees. The dry mining is proposed to be performed by a mining contractor under a fixed and variable schedule of rates contract. Clearing and grubbing of vegetation is completed before dry overburden removal, which is followed by overburden removal by the Overburden Dredge to expose scheduled mining blocks.

Ore mining is planned to average 11.78 Mtpa with mining rates for the dredging operation averaging 1,582 tph.

During the pit optimisation study, all material below the reach of the Overburden Dredge was assumed to be mined by the Ore Dredge and processed through the WCP regardless of its classification ........

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