THE DRILL SERGEANT: De Grey Mining (ASX: DEG) reported results from a metallurgical testwork program undertaken at the company’s Hemi and regional deposits, south of Port Hedland in Western Australia.
De Grey Mining is conducting a comprehensive metallurgical testwork program across each of the mineralised zones at Hemi (Brolga, Aquila, Crow and Falcon) and the regional deposits of Mallina and Withnell.
The other main regional deposits of Toweranna and Wingina are free milling and will be able to be treated through a conventional CIL circuit.
Gravity testwork on three composite samples from Brolga achieved gold recoveries of 12.4 per cent, 27.3 per cent and 12.1 per cent as gravity testwork continues on samples from Aquila, Crow and Falcon.
Overall gold recoveries of 95 per cent have been achieved on samples from Brolga using a flowsheet combining gravity, flotation/oxidation and CIL in initial testwork to date.
“The results from our ongoing metallurgical testwork program continue to give us confidence in the multiple pathways we have to achieve high gold recoveries from Hemi and the regional deposits at Mallina,” De Grey Mining managing director Glenn Jardine said in the company’s ASX announcement.
“Each of the potential oxidation processes delivered high recoveries, with POX and Albion® the standouts respectively at 97 per cent and 98 per cent.
“Further testwork and trade off studies underway will enable us to optimise the various aspects of our metallurgical program in terms of capital, operating costs, recoveries and operability.”
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