Mining Intelligence and News

Windarra Project

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Mine TypeTailings
  • Gold
  • Silver
Mining Method
  • Hydraulic mining
  • Truck & Shovel / Loader
Mine Life... Lock
SnapshotA Definitive Feasibility Study on retreating the gold tailings at Windarra and Lancefield was completed in July 2021.

On September 7, 2022, Poseidon Nickel entered into a binding head-of agreement with Green Gold Projects for the processing of the Windarra gold tailings project in Western Australia.

A final agreement is subject to Green Gold being satisfied with the outcome of metallurgical testwork and a bankable feasibility study being completed at its expense.

Upon achieving these milestones, Green Gold will earn a farm-in interest in the project, and be responsible for its funding, development and operation.


Poseidon Nickel Ltd. 100 % Indirect
Poseidon has tenure over the Windarra Gold Tailings (North and South Dams), which are contained within the much larger Mining Lease M261SA, owned by Poseidon Nickel Limited.



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Deposit type

  • Tailings


Between 1981 and 1994, approximately 5.1 Mt of gold ore was treated at an average head grade of 5.1 g/t gold producing over 700,000 ounces of gold at a recovery of 84.2%. The gold tailings were isolated from the nickel tailings and deposited initially in the South dam and then the North dam from 1988. The North dam contains approximately 80% of the gold tailings tonnage. A minor proportion of gold tailings was deposited on top of the Central dam to assist with capping the nickel tailings prior to rehabilitation of the Central dam.

Poseidon is considering development of the Windarra Gold Tailings Project, which comprises the Windarra Gold Tailings Mineral Resource contained within the North and South tailings dams (Windarra) and the Lancefield Gold Tailings Mineral Resource contained on License To Treat (LTT) tenement 700-3709 (Lancefield). The Mineral Resource comprises 4.75 Mt at the Windarra North and South dams at an average grade of 0.73 g/t gold and 1.21 Mt at Lancefield at an average grade of 1.27 g/t gold, all classified as Indicated resources. There is a total of approximately 161,000 ounces of gold contained within the Project Mineral Resource at Indicated classification. The Project also has access to an additional 0.38 Mt at an average grade of 1.20 g/t gold at Lancefield currently classified as an Inferred resource. With additional resource definition drilling it is considered likely this material would be reclassified to an Indicated resource also.



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Mining Methods


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Crushers and Mills

Milling equipment has not been reported.



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Gold oz 53,490
Silver oz 136,947
All production numbers are expressed as metal in doré.

Operational metrics

Annual processing capacity  ....  Subscribe
* According to 2021 study.

Production Costs

All-in sustaining costs (AISC) Gold  ....  Subscribe
C1 cash costs Gold  ....  Subscribe
All-in costs Gold  ....  Subscribe
Assumed price Silver  ....  Subscribe
Assumed price Gold  ....  Subscribe
* According to 2021 study / presentation.

Operating Costs

OP mining costs ($/t milled) AUD 2.85 *  
Processing costs ($/t milled) AUD  ....  Subscribe
G&A ($/t milled) AUD  ....  Subscribe
Total operating costs ($/t milled) AUD  ....  Subscribe
* According to 2021 study.

Project Costs

MetricsUnitsLOM Total
Closure costs $M AUD  ......  Subscribe
Total CapEx $M AUD  ......  Subscribe
OP OpEx $M AUD  ......  Subscribe
Processing OpEx $M AUD 45.6
G&A costs $M AUD 5.5
Total OpEx $M AUD  ......  Subscribe
Gross revenue (LOM) $M AUD  ......  Subscribe
Pre-tax Cash Flow (LOM) $M AUD  ......  Subscribe
Pre-tax NPV @ 8% $M AUD  ......  Subscribe
Pre-tax IRR, %  ......  Subscribe
Pre-tax payback period, years  ......  Subscribe

Heavy Mobile Equipment

Fleet data has not been reported.


Mine Management

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Sep 24, 2023


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