Summary

Mine Type	Tailings
Study Completed	Feasibility
Study in Progress	Feasibility Update
Stage	Permitting
Commodities	Gold Silver
Mining Method	Hydraulic mining Truck & Shovel / Loader
Mine Life	...
Snapshot	The Windarra Gold Tailings Project comprises the Windarra Gold Tailings Mineral Resource and the Lancefield Gold Tailings Mineral Resource. On July 31, 2024, Poseidon Nickel Ltd. entered an agreement with Encore Minerals to develop the Windarra Gold and Nickel Tailings using proprietary Glycine Leaching Technology. Encore Minerals is responsible for the funding, development, operation, closure and rehabilitation of the Windarra tailings project. Encore Minerals is progressing with feasibility studies based on using GLT and other patented technology to process the gold tailings at Windarra and Lancefield. Outcomes from these studies will support potential development of the project. Next Steps Encore Minerals is progressing with feasibility studies based on using GLT to process the gold tailings at Windarra and Lancefield. Outcomes from these studies will support potential development of the project.
Related Asset	Mount Windarra Project

Deposit type

• Tailings

Summary:

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 classified as an Inferred resource. With additional resource definition drilling it is considered likely this material would be reclassified to an Indicated resource also.

Mining Methods

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Comminution

Crushers and Mills

Processing

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Commodity Production

Operational metrics

Metrics
Hourly processing rate	....
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Personnel

Job Title	Name	Profile	Ref. Date
.......................	.......................		Oct 26, 2025