Perseus carried out the geological interpretation for Sissingué. Widenbar and Snowden reviewed the interpretation prior to estimation and considers it to be an accurate reflection of the geology of the orebody. The following section is taken from Widenbar (2013) and summarises the geological interpretation provided by Perseus.

In the central part of the Sissingué prospect ('Sissingué Main'), the major host rock is a medium to coarse grained, veined, altered and sulphidised granite. Chemically identical to the porphyritic dykes, it is formed by several of these dykes that have been attenuated by a structural feature, possibly a fold plane, to flow into each other and to form a pear-shaped, approximately 50 m thick body.

Alteration is most intense and gold grades, on average, are highest in the roof of this intrusive body and in the coarse grained sediments above. Emplacement of the dykes is believed to have occurred in several stages or over an extended period as several dykes cross cut the granitic body, some with fuzzy contacts (interpreted as emplaced during cooling period of the granitic body), others with sharp contacts (emplaced after cooling of granite). Gold mineralisation is relatively homogeneous in the upper portion the granite. At depth, with decreasing intensity of alteration, the tenor of the mineralisation decreases.

Elsewhere, mineralisation is interpreted to be associated with isolated dykes and altered sediments in their respective vicinities. This distribution leads to a bi-directional ore body: Granite and associated altered sediments in north- north-eastern extent and with sub-vertical or steep westerly dips, and north-west striking dykes with associated altered sediments, obliquely cross cutting and steep to moderate easterly dips. The most significant zone of gold mineralisation is the Main Zone with its granitic bodies, various dykes and a pervasive alteration halo due to the larger mass of the intrusives.

Gold mineralisation at Sissingué is associated with the porphyritic dykes of tonalitic composition that cross cut the flysch sediments (turbidites). Subsequent metasomatism of the tonalite has led to:

- a sericite-carbonate alteration within the intrusives and the more permeable horizons (sandstones and conglomerates) of the turbidites
- low to moderate grade disseminated gold mineralisation.

Late stage high grade Au-As-quartz-carbonate veins exploited the altered and brittle portions of the intrusives and sediments with common occurrences of visible gold.

Gold mineralisation is found as three distinct styles as summarised below:

• Disseminated or fracture related mineralisation in the felsic intrusive closely associated sericite-carbonate alteration, silification and a pyrite and arsenopyrite mineralisation. The average gold tenor of this type of mineralisation is usually relatively high (2 g/t Au to 5 g/t Au).

• Significant low grade gold mineralisation (commonly below 2 g/t Au) is encountered within sediments immediately adjacent to the intrusive bodies within their respective alteration halos. The gold tenor are perceived to be closely correlated to alteration intensity and hence with primary porosity of the rocks. Sandstones and conglomerate are usually better mineralised than fine grain mud- and siltstones.

• High grade mineralisation (with grades exceeding 1,000 g/t Au) is associated with quartzveins which are encountered in the upper portion of the intrusive bodies and in the altered and brittle portion of sediments directly above. Visible gold is common.

The mining method planned for the operation is conventional open pit excavation with ex-pit waste dumping. The pit will be accessed by a 20 m wide haul road incorporating a 10 percent gradient and two lane ramps. At the pit floor the final benches will be accessed using single lane ramps.

The ramp exit points for each design were placed on the east to provide the shortest hauls to the ROM pad and waste dump. The waste rock dump was located to the east of the pit and adjacent to the processing plant.

Plant Capacity: 1.8Mtpa oxide ore, 1.0Mtpa fresh ore
Process Circuit: Crushing, grinding, gravity, CIL
Process equipment:

Crushing
* Primary crushing: Metso C120 Jaw Crusher
* Dead COS/Surge Bin
Grinding
* Metso 6.1 X 6.1m SAG Mill in Closed Circuit
* Forged steel 105mm balls.
SCATS Crusher
* 1 x METSO HP 200 (Fresh rock only)
Gravity Circuit
* Knelson Concentrator/Gekko ILR/Dedicated EW Cell
Thickening
* 15.0m High Rate Autotec
ADR
* CIL: 1 x Pre-leach, 6 x CIL Tanks
* Equipment: 7 x 1,041m3 Tanks, Residence Time 20hrs Oxide, 38hrs Fresh.
* 2t/Day PSA Oxygen Plant
* 4t Zadra Elution Circuit
* 2 x EW Cells
* Calcining Oven/Diesel Fired Furnace
Utilities
* Power: 8 x CAT 2MVA Gensets, Rating 1.4MW ea
* Water: Bagoe River / Boreholes
Reagents
* Cyanide (Pellets) – ORICA
* Grinding Media – METSO
* Lime – Afriserve

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