Millennium assessing much lower cost processing

9th February 2018
Resources Rising Stars

Millennium Minerals is looking to dramatically cut the capex of a planned primary processing venture at its Nullagine gold operation (reports MiningNews).

Instead of spending A$40-$46 million building and integrating a flotation circuit into the current Nullagine set-up, the gold miner is now looking at tacking-on a small modular concentrating circuit to the tail-end of the existing CIL plant.

Such a development could cost $12-15 million.

The basis of the new process method is scavenging un-leached sulphide concentrates from the existing CIL tailings and subjecting them to ultra-fine grinding and intense cyanidation in order to achieve an improvement in the overall leach recovery.

“This method is well understood and has been used successfully for many years to maximise the recovery of processed sulphide ore at other major WA gold mines including Granny Smith and KCGM in Kalgoorlie,” Millennium said.

The company has appointed Dale Harrison from MineScope Services as study manager, with engineering firm Ausenco also introduced to complete the trade-off study as part of the “sulphide ore expansion study”.

Millennium is aiming to become a 100,000oz-a-year producer by unlocking the existing 850,000oz sulphide mineral resource inventory at Nullagine.

The company produced 73,000oz in 2017, with cash and bullion at the start of 2018 totalling $22.4 million.


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