The Dalgaranga Gold project is located in the Dalgaranga Greenstone Belt in the Murchison Province of Western Australia. The North-East trending belt consists of high magnesium basalt, tholeiitic basalt, intermediate volcanic, felsic intrusive porphyry, and a volcano-sedimentary sequence dominated by black shale and volcaniclastic lithologies. The Greenstone sequence is intruded by large gabbro complexes in the north (Mt Farmer, Mt Charles) and to the west (Dalgaranga Hill). The stratigraphy has been folded into two regional synforms which plunge in opposite directions separated by a regional fault/shear along the western side of the Mt Farmer gabbro sill. The Dalgaranga Greenstone Belt is intruded by a number of post tectonic granites separated by zones of amphibolite and mafic schists intruded by pegmatites.

Gilbeys deposit
The main body of mineralisation at Gilbeys is hosted by a porphyry - shale / volcaniclastic package and varies from 20 to 110 metres in width. A combined thickness of the main zone and parallel mineralised zones is up to 200m wide. The style of mineralisation at Gilbeys is a quartz pyritecarbonate veined ductile shear system.

The major control on mineralisation at Gilbeys is structure. A major ductile shear hosts the mineralisation, with the ore grade material developing as consistently wide sub parallel lodes in the areas of strongest shearing. A flat and late vein stage is visible in the footwall and ore-zone, these quartz + sulphide veins appear to be variably mineralised.

Golden Wings Deposit
Golden Wings mineralisation is a plunging orebody limited to a short strike length of mineralised shear zone. There are several mineralised shears developed within a 100m wide zone over 450m of east-west mineralised structure. The geometry of the orebody within the broad east west trend, is, dominated by a high grade zone trending 065-070° dipping steeply to the North, slightly oblique to the stratigraphy. A review of the historic Newcrest, Equigold reports and recent Gascoyne Resources drilling shows multiple gold mineralised zones occurring in the following fresh rock types around 100m; sericite chlorite-quartz schists after mafic or sedimentary units, and quartz-pyrite arsenopyrite plunging lodes within biotite sericite-carbonate-pyrite schists.

The development of the Gilbey’s pit will include 3 stages of cut-back, with stage 3 being the final (ultimate) pit. The proposed ultimate pit measures approximately 1,560m in length by 680m wide, extending vertically to a level of 145m RL, a maximum depth of approximately 275m below surface. The majority of the walls of the proposed pit design contains ramps. The proposed development of the Golden Wings pit measures approximately 450m in length by 200m wide, extending vertically to a level of 300m RL, a maximum depth of approximately 140m below surface.

For extractive recovery testwork, samples were ground to 90µm and subjected to gravity separation followed by cyanide leaching. The porphyry samples were subjected to a timed direct cyanide leach and the shale samples were subjected to a 20 hour CIL leach. The RC composite samples from Gilbeys and Golden Wings were also subjected to a 20 hour CIL leach. The CIL leaches were utilised due to the presence of organic carbon in the samples and the 20 hour was based on the proposed plant residence time being 19 hours.

Significant amounts of gravity gold are present in all samples and gold leaching kinetics are very fast with the majority of leaching complete at 12 hours. Gravity gold recoveries at 90 µm grind from Gilbeys core samples ranged from 29.6% to 45.9%. Gravity gold recoveries from Golden Wings RC samples ranged from 26.7% to 71.1% at 90µm grinds. A conservative gravity recovery of 30% was utilised for FS design purposes.

The gold recoveries used for optimisat ........