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Australia
Windarra Project

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 Location:
21 km NW from Laverton, Western Australia, Australia

  Project Contacts:
Level 1 3 Ord Street
West Perth
Western Australia, Australia
6005
Phone  ...  Subscription required
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Overview

StagePermitting
Mine TypeTailings
Commodities
  • Gold
  • Silver
Mining Method
  • Truck & Shovel / Loader
  • Hydraulic mining
Mine Life3.75 years (as of Jan 1, 2021)
A 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.


Owners

Source: p. 35
CompanyInterestOwnership
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.

Contractors

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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 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.


Mining Methods

  • Truck & Shovel / Loader
  • Hydraulic mining


Summary:

Reclamation of gold tailings from the North and South dam of the decommissioned Windarra TSF by hydraulic mining methods for processing, including the introduction of the Lancefield gold tailings via mechanical mining and haulage (via road train) from Lancefield to Windarra.

Description
Production is expected to begin at Lancefield which will be conventionally mined using a front-end loader over a 9-month period. The Lancefield tailings will be hauled using triple (or quad) road trains to Windarra for processing. Subject to the mining method option selected, the Lancefield tailings will either be side-tipped into a raised landform excavated trench (Hydraulic Mining option) or side-cast atop of the northern perimeter wall of the Windarra North dam (Amphibious Dredging option). The tailings will then be pumped to a conventional 1.5 Mt per annum Carbon-In-Pulp (CIP) gold processing plant to recover the gold and silver.

Once mining of the Lancefield tailings is complete, the Windarra North and South dams will be reclaimed over a 36-month period and pumped to the CIP gold processing plant. The reprocessed tailings would be pumped through a pipeline approximately 17 km long and deposited into the disused South Windarra Pit. The South Windarra Pit contains over 23 Mm3 of saline water that will be utilised as the main water supply for the Project.

Final tailings storage is proposed to be within the disused South Windarra Pit. Detailed solute tra ........


Crushing and Grinding


Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.


Projected Production:

CommodityUnitsLOM
Gold oz 53,490
Silver oz  ......  Subscription required
All production numbers are expressed as metal in doré.

Operational Metrics:

Metrics
Annual processing capacity  ......  Subscription required
* According to 2021 study.
Subscription required - Subscription is required.

Reserves at July 23, 2021:

CategoryTonnage CommodityGradeContained Metal
Probable 5,544,068 t Gold 0.84 g/t 150,473 oz
Probable 5,544,068 t Silver 2.1 g/t 373,881 oz
Proven & Probable 5,544,068 t Gold 0.84 g/t 150,473 oz
Proven & Probable 5,544,068 t Silver 2.1 g/t 373,881 oz
Indicated 5,962,084 t Gold 0.84 g/t 161,278 oz
Indicated 5,962,084 t Silver 2.1 g/t 399,401 oz
Measured & Indicated 5,962,084 t Gold 0.84 g/t 161,278 oz
Measured & Indicated 5,962,084 t Silver 2.1 g/t 399,401 oz
Inferred 337,964 t Gold 1.2 g/t 13,063 oz
Inferred 337,964 t Silver 3.48 g/t

Commodity Production Costs:

CommodityAverage
All-in sustaining costs (AISC) Gold  ......  Subscription required&nbs
C1 cash costs Gold  ......  Subscription required&nbs
All-in costs Gold  ......  Subscription required&nbs
Assumed price Silver  ......  Subscription required *
Assumed price Gold  ......  Subscription required *
* According to 2021 study / presentation.
Subscription required - Subscription is required.

Operating Costs:

Units2021
OP mining costs ($/t milled) AUD 2.85 *
Processing costs ($/t milled) AUD  ......  Subscription required
G&A ($/t milled) AUD  ......  Subscription required
Total operating costs ($/t milled) AUD  ......  Subscription required
* According to 2021 study.
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2021 Study Costs and Valuation Metrics :

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


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Nov 22, 2022
....................... Subscription required ....................... Subscription required Subscription required Nov 22, 2022
....................... Subscription required ....................... Subscription required Subscription required Nov 22, 2022
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Corporate Filings & Presentations:

DocumentYear
Annual Report 2022
Press Release 2022
................................... Subscription required 2021
Subscription required - Subscription is required.

Subscription required - Subscription is required.

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