The Wiluna Mine is located close to the town of Wiluna, approximately 750km northeast of Perth. Altogether over 4 million ounces of gold has been produced from 20 open pits and 3 underground mines, including the Golden Age mine which is currently a source of high grade free milling ore. All the mines are within 4kms of the Wiluna processing facility. JORC 2012 Mineral Resources currently comprise 37.9Mt @ 4.09g/t Au for 5.0Moz.
Mineralisation is hosted within near-vertical shear zones that range in thickness from 5 to 70m, and generally strike north-south or northeast-southwest. The shear zones flex along strike and down dip, and these flexures in conjunction with favourable host rocks form the best ore zones.
Wiluna ores are typically oxide, refractory sulphide, or quartz reef free-milling ores, with most gold occurring within fine-grained sulphides. Wiluna sulphide gold ore was processed through the existing sulphide circuit for 20 years between 1993 and 2013. Overall gold recovery is largely a function of sulphide recovery through the flotation circuit and metallurgical results suggest an improvement on sulphide flotation may improve gold recovery.
Blackham’s recently completed Preliminary Expansion Study results confirm the potential to expand production at Wiluna to over 200,000ozpa. The Company has a number of options and flexibility as to how the Operation can be expanded to over 200,000ozpa which will be further examined during the Feasibility Study due for completion in the December 2017 quarter. These options include but are not limited to, timing of execution, option of producing a flotation concentrate for sale and examining underground bulk mining opportunities, particularly around the East/West underground mines.
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