The Bibiani deposit is hosted within a thick sequence of fine-grained graded turbidites with localised thin interbeds of fine to medium-
grained turbiditic sandstones. The orebody is a mesothermal lode-type deposit which is similar to the lode deposits in the Konongo-Axim belt hosting the significant Obuasi deposit. The Bibiani orebody geometry is structurally controlled by a steep, north to north-east trending shear corridor 200 - 400m wide, within Lower Birimian sediments and close to the \ eastern contact of the Upper Birimian. The shear zone includes quartz infill as massive veins and quartz stock works. In the widest parts of the orebody, two and locally three individual quartz reefs or lodes can be identified. Two highly graphitic fault zones, historically referred to as pug seams or fissures, are associated with the major shear zone on footwall and hanging wall sides.

In general, the orebody dips east at 60 - 80°, crossing the regional structure at acute angles. At the centre of the mine the orebody alignment is 030 - 035° which changes to around 020° at the northern end of the mine. The strike of the bedding cuts across the strike of the ore body at acute angles. Traditionally the ore body has been divided into a northern and southern part based on the location of the central shaft, which lies on section line 5400N. Despite this the orebody is essentially continuous.

The southern ore zone is around 180m long and consists of a composite vein of quartz and mineralised country rock dipping about 60° to 70° to the east. The northern orebody consists of the continuation of the west lode and of the east and central lodes, which are less distinct toward the south. The latter reef lodes consist of more massive laminated smokey quartz with phyllite partings. Milky white quartz is also present, but is generally barren.

The northern ore zone has been mapped at 20 - 40m width near the surface and widens substantially at depth. At around 100 – 120m relative level (“mRL”) (the underground 4 and 5 Levels) horizontal widths exceed 100m. The dips are generally near vertical at surface, but the eastern boundary flattens moderately at depth to less than 65° around 150mRL. The lodes merge approximately 400 - 500m north of the central
shaft. Further to the north the orebody narrows and continues as one near-vertical reef 15 - 25m in width.

The mining method determined to be the most viable is Long Hole Open Stoping. The stope is commenced via a slot raise at one end of the ore drive and then mined by progressively firing the drill rings and retreating along strike.

A 2.75g/t block cut-off was used for determining the available stoping blocks. This accounts for stope recovery, unplanned dilution, processing recovery and all operating and realisation costs, and was based on assumed gold price of US$1,150 per ounce.

Level designs will comprise the following:
-Main level access excavated 5.5m wide and 5.5m high with an arched profile;
- Footwall drives excavated 5.5m wide and 5.5m high;
- Cross cuts and ore drives designed to fit long hole drills and loaders;
- Stockpiles for storing stope ore ready for truck loading placed every 150m along the footwall drive; and
- A sump placed in the Main Level access and be linked to the lower Levels via a drain hole.

A review of the current ore treatment plant at Bibiani and the results of testwork to date was used to develop an effective processing flowsheet to achieve satisfactory recovery. Gold is predominantly fine and occurs along edges or cracks in pyrite and arsenopyrite sulphide minerals. The process design produces a sulphide concentrate by flotation at a primary grind size of P80 106µm. Concentrate is fine ground to P80 25µm prior to cyanidation. The flotation tails are also cyanide leached. Gold recovery is via carbon in leach. Key process design parameters are provided below:

-Primary crushing to a P80 of 120mm;
-Milling via the existing SAG mill operation in single stage closed circuit, producing a product size of P80
106µm;
-Flash flotation to a target mass pull of 2%;
-Scavenger flotation which together with the flash flotation concentrate, recovers a total combined concentrate 93% gold, 98% sulphides nd 60% of the organic carbon, into a
concentrate mass which is 10% of new feed;
-Leaching of Concentrate in a carbon in leach (“CIL”) circuit