Mineralisation at White Foil is hosted within a brittle quartz gabbro unit. The gold is associated with quartz stockworks. Structural studies confirms the presence of two main vein sets at White Foil with a dominant moderately NNW dipping set (51º/346º dip and dip direction) and a secondary SSE dipping set (56º/174º dip and dip direction). An identifiable systematic bias associated with drilling direction has not been established. The main strike to the gabbro unit is NNW-SSE and it plunges steeply towards the NNE. The predominant drill direction was to the SE.

The White Foil gold deposit is a quartz stockwork hosted in a gabbro. The gabbro is differentiated broadly into a quartz-rich phase in the west. This quartz gabbro unit is the most hydrothermally altered unit and contains the bulk of the gold mineralisation. The White Foil deposit is bounded to the west by hangingwall volcaniclastic rocks. To the east mineralisation becomes irregular and uneconomic in the more melanocratic phase of gabbro. Mineralisation is controlled by sheeted systems of stockwork veining, which has imparted strong alteration and sulphidation to the quartz gabbro.

White Foil is the open pit mine at the Mungari operations and utilises conventional drill and blast, load and haul methods.

Three stage crushing: Primary Metso C140 Jaw crusher (220kW) -1250 x 940mm throat- feed size 800mm, product size p80-120mm. Secondary(1) and tertiary(1) crushers: Metso HP 4 (315kW) Product size 17mm. Product Screen: Joest inclined vibrating screen 2.44 x 7.6m. 4 x conveyor belts, Belt and static magnets as well as a rock breaker for the primary crusher.

Ball Mill with 4,500kW installed power, Mill size 5.5m(dia) x 8.74m(l), Polymet composite liners, Classification Weir Cavex 250mm (x11) Grind size p80 – 106 µm.

Recovery method - Gravity and CIP.

Leaching:
2 x 1,140 m3 tanks
Adsorption: 6 x 750 m3 tanks
Elution: split AARL
Electrowinning: 3 x Consep tanks [2 x carbon-in-leach (CIL), 2 x gravity]

Gravity circuit
Concentrator: 2 x Knelson
Intensive Leach: Consep Acacia

Processing plant operational data was used to drive higher gold production. Some of the initiatives the team executed to achieve this result included:
- Reviewing and analysing grinding circuit data which identified instances where capacity was not being taken advantage of and making changes which led to increases in mill utilisation
- Ensuring the availability of crushed ore stock in front of the mill so that crusher shutdowns have less impact.

The $A12.4 million improvement has been achieved due to higher gold production than previously obtained as a result of these process improvements through the analysis of data.