THE BOURSE WHISPERER: Blackham Resources (ASX: BLK) kept the market abreast of metallurgical testwork underway on Wiluna oxide and transitional ores at the company’s Matilda-Wiluna gold operation in Western Australia.
Blackham Resources is conducting the Wiluna mining and metallurgical studies following the success of the Wiluna Expansion Preliminary Feasibility Study (Expansion PFS) carried out in 2017.
The company explained the latest testwork confirms the Wiluna oxide and transitional ores are an attractive feed stock for the current operating Wiluna CIL plant.
All the historic open pits were processed through the Wiluna CIL plant except for the 2007 East pit cut back.
Blackham said the metallurgical testwork it has carried out on both the oxide and transitional ores has confirmed that these ores are best processed through the current CIL plant.
In the Expansion PFS it was conservatively assumed that the transitional ores would be processed through the Flotation and Biox Plant (Sulphide Circuit).
The transitional ore can gain higher recoveries through the CIL plant cutting the processing cost by approximately 30 per cent compared to the sulphide circuit.
“Blackham is currently re-estimating the open pit free milling resources and reserves around the Wiluna Mine site,” the company said in its ASX announcement.
“The Blackham management team believes the free milling ores within the existing Wiluna Mine footprint are an attractive feed stock for the current operating mill and allows for fast tracking mining approval.”