The MCSS (Mount Coolon Scoping Study) evaluates the economic potential of three deposits which includes Eugenia, Koala & Glen Eva.

Koala
Auriferous epithermal veining at Koala is hosted in a thick package of shallow dipping andesitic to rhyolitic volcanic flows, which form part of the regional Drummond Basin Cycle 1 sequence. The Koala gold mineralisation lies approximately 500m east of a major granodiorite intrusion and is preferentially hosted by porphyritic andesite.

High grade gold mineralisation at Koala occurs in a narrow, steeply dipping high grade colloform quartz vein sporadically enveloped by a wider lower grade, veinlet stockwork and is locally disrupted by faulting. The main vein has been defined by drilling over a strike length of about 1,200m and down dip about 200m.

The main vein is offset by steeply dipping, west-northwest striking cross faults with high grade zones sometimes formed at the intersection of the cross faults and the main vein. The most significant cross fault is the Sullivan Fault which forms a zone about 20m wide at the south end of the Ross Mining pit.

The main vein changes dip direction along strike. In the south it dips steeply to the west, whereas in the north it dips steeply to the east. The main vein splits into a series of splay veins at the southern end. To the North the up-dip extent of the main vein appears to be capped by a rhyolitic unit which results in a gentle north plunge to the ........

GBM Resources plans to develop the Koala, Glen Eva and Eugenia deposits that will be extracted using conventional drill and blast, load and haul and dump activities. The Glen Eva and Eugenia deposits will be open pit only operations, and Koala will include both an open pit and underground operation. Additionally, the historical tailings located at Koala will be reprocessed.

Pit Designs
In order to maintain a minimal footprint and achieve optimal depth, a single lane 12m wide ramp has been adopted for all designs. The single lane ramp is considered appropriate as a result of the pits shallow depth and the low production rates required by the processing plants. Design parameters assumed contract mining would be adopted using conventional 100t rigid body off-highway trucks and an appropriately sized excavator.

The mining schedules were simple bench by bench schedules targeting an annual mining limit of 3Mtpa.

Dumps were designed to accommodate waste material mined from each of the pits. The indicative dumps have been designed to the final rehabilitated landform of 27 degrees overall slope angle.

During mining, it is envisaged that each of the dumps be generally constructed in 20m vertical lifts, with the width of the berms being refined as the project progresses. Each of the dumps have the capacity to store all waste material from that deposit. Where the full capacity of the dump is not required, either the dump height or the du ........

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