Tag Archives: Wiluna Mining

Wiluna Mining lays renewable energy groundwork with Contract Power extension

Wiluna Mining Corp has signed a 10-year contract extension with Contract Power Group that will see the power provider charge up the Wiluna Mining Operation in Western Australia until at least 2031.

The contract is geared towards meeting the forward needs of the Stage 1 development project at Wiluna, to provide a total rated power output of the power station of 14.1 MW. It will also re-configure the power station to increase gas generation and add a 2 MW battery energy storage unit to significantly reduce the need for back-up diesel generation, with four diesel generators being removed.

The new pact will also allow amortisation of costs over a longer period, therefore reducing Wiluna’s overall operating power charges; the company said.

And, when it comes to the Stage 2 development expansion project in 2023 at Wiluna, the contract will provide a solid base for a future mixed renewables power station, the company said.

Back in October, Wiluna Mining’s board gave the thumbs up to the Stage 1 development, which will see the company transition from its current production profile of producing 62,000 oz/y from mining free milling ore through the current 2.1 Mt/y carbon-in-leach processing facility, to initially producing 100,000-120,000 oz/y of gold and gold in concentrate. This will be implemented using the current, recently refurbished crushing circuit, the previously expanded mill circuit and a new 750,000 t/y concentrator by October 2021, the company said.

Wiluna then intends to increase production of gold and gold in concentrate by, at a minimum, doubling the mining rate and the concentrator to produce circa-250,000 oz/y by the end of 2023/early 2024 as part of Stage 2.

Contract Power, a subsidiary of Pacific Energy, has provided Wiluna’s power – a mix of natural gas and diesel power backup – since June 2016.

“Contract Power Group are experts in efficient generation of electrical power and in decarbonisation by harnessing off-grid wind or solar power,” Wiluna said. “Wiluna are refining its plans with Contract Power Group to include decarbonisation within our methods of power generation at site. This may also moderate our exposure to future volatility in the cost of hydrocarbon fuels.”

Wiluna will now focus on renewable power studies and options during 2021 and 2022 to:

  • Assess the right mix of renewables including solar, wind or pumped storage options;
  • Determine how best to integrate renewables into the total power delivery for an expanded operation; and
  • Optimise the decarbonisation of power generation with reliability and cost effectiveness.

Milan Jerkovic, Wiluna Mining’s Executive Chair, said: “We look forward to working with Contract Power to not only transitioning the Wiluna Mine once again into one of Australia’s biggest and most profitable gold mines, but to helping it become one of Australia’s cleanest mines.”

Byrnecut and Wiluna Mining strengthen ties with five-year alliance

Wiluna Mining says it has formally agreed to enter a five-year alliance with contractor Byrnecut Australia Limited for the performance of underground development and production mining services at the Wiluna Mining Complex in Western Australia.

Wiluna Mining has commenced a three-year, staged development plan that will see it capable of treating all ore types at Wiluna through four processes including an existing 2.1 Mt/y carbon-in-leach process plant; a 750,000 t/y flotation and concentrator, commencing construction this month with commissioning due in October, scaling up to 1.5 Mt/y capacity by the 2024 financial year; gravity circuit; and tailings retreatment plant.

On conclusion of the staged development plan, which is being developed to match the rate of the underground mining development, Wiluna Mining says it will be capable of processing all its ore at the Wiluna Mining Operations and will be producing some 250,000 oz/y. Most of the gold at this stage will be produced as a concentrate, however gold doré produced on site in parallel to concentrate sales will be continued to improve and optimise operating margins.

Wiluna said back in October that Murray Engineering had been contracted to supply and maintain mine fleet for current production, associated development and stoping at the operation, while Byrnecut would provide equipment and personnel for existing development rehabilitation and new development for resource-reserve drill out programs and production from new mine areas.

Byrnecut, following the most recent agreement, will be responsible for development and eventually the mining of the underground mine at the Wiluna Mining Centre, Wiluna Mining said.

The Byrnecut pact will also allow Wiluna Mining to amortise significant agreed mine capital and establishment costs over the five-year alliance period and provides the framework and certainty to a long-term seamless integrated approach to both mine planning and mining services execution to ensure the best outcomes and risk mitigation, it said.

Milan Jerkovic, Wiluna Mining’s Executive Chair, said: “We are pleased to enter into the five-year alliance with a world-class mining contractor in Byrnecut. We see great synergies and efficiencies as well as cost and capital benefits through the alliance. It provides, with a great degree of confidence, that the underground development and ongoing mining will be executed with the highest standard of efficiency, safety, timeliness, and profitability.

“We look forward to working with Byrnecut to transitioning the Wiluna Mine, once again, into one of Australia’s biggest and most profitable gold mines.”

This agreement is conditional on the completion of the final contract documentation, which is underway, and respective board approvals.

Full speed ahead for Wiluna Mining sulphide gold project

Wiluna Mining’s board has approved the staged development of its sulphide project at the Wiluna gold operation in Western Australia, enlisting GR Engineering Services to build the 750,000 t/y concentrator required to process the ore.

The development will see the company transition from its current production profile of producing 62,000 oz/y from mining free milling ore through the current 2.1 Mt/y carbon-in-leach processing facility, initially producing 100,000-120,000 oz/y of gold and gold in concentrate.

This will be implemented using the current, recently refurbished crushing circuit, the previously expanded mill circuit and a new 750,000 t/y concentrator by October 2021, the company said. This forms Stage 1 of the project. Wiluna then intends to increase production of gold and gold in concentrate by, at a minimum, doubling the mining rate and the concentrator to produce circa-250,000 oz/y by the end of 2023/early 2024. This is Stage 2.

Of the A$81 million ($58 million) capital cost estimate of the sulphide project, of which around A$20 million has already been committed, the concentrator is expected to cost A$26 million, pre-production underground mine activities/infrastructure development is estimated at A$37 million, drilling comes in at A$9 million and the feasibility study had a A$2 million price tag. A 10% contingency of A$7 million was also calculated.

Wiluna said Murray Engineering has been contracted to supply and maintain mine fleet for current production associated development and stoping, while Byrnecut Contractors have been engaged to provide equipment and personnel for existing development rehabilitation and new development for resource-reserve drill out programs and production from new mine areas.

To complement the current equipment and development work, the first development crew from Byrnecut is expected to be mobilised in the December quarter with further development crews to be mobilised during June 2021 to maintain the required work program, the company said.

GR Engineering has been appointed as the engineering, procurement and construction contractor by Wiluna for Stage 1 works relating to the concentrator development, the engineering firm said, adding that it expects to commence work in early December with commissioning scheduled for October 2021.