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- De Grey Mining (DEG) achieves an overall recovery rate of 91.9 per cent from the Brolga zone at the Hemi deposit in Western Australia
- Testwork was undertaken on a 4.5-tonne sample of fresh primary mineralisation with a final reject tail grade of 0.07 g/t gold recorded
- De Grey Managing Director Glenn Jardine says the new pilot testwork results demonstrate the high metallurgical recoveries the company is achieving across its Hemi deposits.
- The generated concentrate is currently being used for downstream process testwork to support an upcoming feasibility study for the Brolga zone
- De Grey is down 0.49 per cent with shares trading at $1.02
De Grey Mining (DEG) has achieved an overall recovery rate of 91.9 per cent from a pilot test of a sample from the Brolga zone at its Hemi deposit in Western Australia.
The company took on the testwork on a 4.5-tonne sample of fresh primary mineralisation from five holes drilled across Brolga.
The initial sample graded 0.9 grams per tonne (g/t) gold with a final reject tail grade of 0.07 g/t recorded.
De Grey Managing Director Glenn Jardine said the new pilot testwork results demonstrated the high metallurgical recoveries the company was achieving across its Hemi deposits.
“The metallurgical recovery at 91.9 per cent on a feed grade of 0.9g/t gold is outstanding,” Mr Jardine said.
“Our ongoing metallurgical testwork program continues to provide confidence in the process flowsheet to achieve high gold recoveries from Hemi and the regional deposits across the Mallina gold project.”
The Brolga sample was first crushed and homogenised before De Grey completed pilot scale milling, classification and sulphide flotation.
The flotation concentrate was sent for pressure oxidation before the company completed cyanide leaching on the oxidised residue.
The generated concentrate is currently being used for downstream process testwork to support an upcoming feasibility study for the Brolga zone.
Work is being undertaken at ALS Perth and includes pressure oxidation optimisation, thickener testing, cyanide leaching optimisation and mineralogical studies.
De Grey has planned a second pilot program which will consist of ore from the Brolga, Eagle, Falcon and Diucon zones.
Shares in De Grey were down 0.49 per cent on the market, trading at $1.02 at 1:02 pm AEST.
