Feysville Gold Project
Astral Resources 100% interest
The Feysville Gold Project is located within the north-north-west trending Norseman – Wiluna Greenstone Belt, within the Kambalda Domain of the Archean Yilgarn Craton, approximately 14km south of the KCGM Super Pit in Kalgoorlie.
Significant gold and nickel mineralisation occurs throughout the belt, including world-class deposits such as the Golden Mile Super Pit in Kalgoorlie owned by Northern Star Resources Limited (ASX: NST) and the St Ives Gold Mine south of Kambalda owned by Gold Fields Limited, as well as the substantial Beta Hunt Gold Mine owned by Westgold Resources Limited (ASX: WGX).
Feysville hosts an MRE of 5Mt at 1.2 g/t Au for 196koz of contained gold1 at the Kamperman, Think Big and Rogan Josh deposits, providing a foundation for the project to potentially become a source of satellite ore feed to a future operation based on Astral’s flagship Mandilla Gold Project.
Locally, Feysville has been interpreted to contain upthrust ultramafics, emplaced within a sequence of volcanic sediments (the Black Flag sediment group), granitic intrusions, mafic basalts, gabbro and andesite.
A map of the Feysville Gold Project identifying tenements and deposits/prospects on local area geology is set out in in Figure 1 below.
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1 Feysville JORC 2012 Mineral Resource Estimate: 4Mt at 1.3g/t Au for 144koz Indicated Mineral Resources and 1Mt at 1.1g/t Au for 53koz Inferred Mineral Resources (refer to ASX Announcement dated 1 November 2024).
Figure 1 – Map of Feysville Gold Project (including tenements and deposits/prospects) on local area geology.
Mineral Resource Estimate (JORC 2012)
On 1 November 2024, Astral reported an updated JORC compliant (2012 Edition) Mineral Resource Estimate (MRE) for Feysville of 5 million tonnes at 1.2g/t Au for 196,000 ounces of contained gold, incorporating the Kamperman, Think Big and Rogan Josh deposits.
The Feysville MRE was reported using a 0.39g/t Au lower cut-off and is constrained within pit shells derived using a gold price of A$2,500 per ounce, the same price as incorporated in the Mandilla MRE reported on 20 July 2023.
The Feysville MRE, which was prepared by independent consultant Cube Consulting in accordance with the JORC Code (2012 Edition).
The locations of the optimised pit shells based on a gold price of A$2,500 per ounce are set out in plan view in Figure 2 below.
Table 1 – Feysville MRE
| Mineral Resource Estimate for the Feysville Gold Project (Cut-Off Grade >0.39g/t Au) | |||
| Classification | Tonnes (Mt) | Grade (g/t Au) | Au Metal (koz) |
| Indicated | 3.5 | 1.3 | 144 |
| Inferred | 1.5 | 1.1 | 53 |
| Total | 5.0 | 1.2 | 196 |
| The preceding statement of Mineral Resources conforms to the Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves (JORC Code) 2012 Edition. All tonnages reported are dry metric tonnes. Minor discrepancies may occur due to rounding to appropriate significant figures. | |||
Table 2 – Feysville MRE by source
| Deposit | Classification | Tonnes (Mt) | Grade (g/t) | Ounces (koz) |
| Think Big | Indicated | 1.9 | 1.1 | 68.1 |
| Inferred | 0.5 | 1.2 | 17.1 | |
| Total | 2.4 | 1.1 | 85.2 | |
| Kamperman | Indicated | 1.1 | 1.5 | 52.4 |
| Inferred | 0.9 | 1.1 | 31.4 | |
| Total | 2.0 | 1.3 | 83.8 | |
| Rogan Josh | Indicated | 0.5 | 1.3 | 23.3 |
| Inferred | 0.1 | 1.0 | 4.1 | |
| Total | 0.7 | 1.3 | 27.4 | |
| Total | 5.0 | 1.2 | 196.4 | |
| All tonnages reported are dry metric tonnes. Minor discrepancies may occur due to rounding to appropriate significant figures. | ||||
Table 3 – Feysville MRE by cut-off grade
| Cut-off grade (g/t Au) | Tonnes (Mt) | Grade (g/t) | Ounces (koz) |
| 0.3 | 5.2 | 1.2 | 198.6 |
| 0.35 | 5.1 | 1.2 | 197.7 |
| 0.39 | 5.0 | 1.2 | 196.4 |
| 0.4 | 5.0 | 1.2 | 196.1 |
| 0.45 | 4.8 | 1.2 | 194.0 |
| 0.5 | 4.7 | 1.3 | 191.3 |
| All tonnages reported are dry metric tonnes. Minor discrepancies may occur due to rounding to appropriate significant figures. | |||
Figure 2 – Map of Feysville Gold Project showing optimised pit shell outlines on local area geology.
Think Big Deposit
The updated JORC 2012 compliant MRE for the Think Big deposit is 2.4Mt at 1.1g/t Au for 85.2koz of contained gold, inclusive of 1.9Mt at 1.1g/t Au for 68.1koz Indicated Mineral Resources and 0.5Mt at 1.2g/t Au for 17.1koz Inferred Mineral Resources.
A cross-section at Think Big illustrating interpreted mineralisation is set out as Figure 3.
Figure 3 – Cross-section at Think Big illustrating interpreted mineralisation.
Think Big is located within the Ethereal shear corridor, a NW trending structure with a large supergene expression. The geological host is a sub-vertical feldspar porphyry swarm intruding into volcaniclastically derived andesitic conglomerates, trending NW with a hanging wall ultramafic unit.
Contacts between conglomerates and porphyries are intrusive; however, the structures are interpreted to have preferentially sheared the contacts, possibly as a result of rheological contrast between the two units.
A long section at Think Big illustrating interpreted mineralisation is set out as Figure 4.
Figure 4 – Long section at Think Big illustrating interpreted mineralisation.
The mineralisation at Think Big predominantly occurs within the volcaniclastic-derived conglomerate hosts between sheared porphyry bodies. The strongest tenor is on the margins of porphyries between closely spaced porphyries – where the conglomerate is moderately to intensely sericitised and albitised.
A series of stacked lodes are present, steeply dipping to the south-west at approximately 70° toward 230° with a total strike length of approximately 500m. The average width of each lode is between 2 – 8 m, with a total width of approximately 110m.
A north-dipping fault cuts through the prospect which is potentially analogous to a north-dipping fault seen at the Kamperman prospect, interpreted to be related to regional D4 deformation and, hence, synchronous with gold mineralisation in the region (for instance, at Mount Charlotte, a deposit within the Super Pit in Kalgoorlie).
A schematic cross-section of Think Big at the location identified in the map above illustrating the deposit geology and principal zones of gold mineralisation to the east of the Ethereal Shear Zone, including the overlaying supergene-enriched gold zone, is set out below.
Kamperman Deposit
The maiden JORC 2012-compliant MRE for the Kamperman deposit is 2.0Mt at 1.3g/t Au for 83.8koz of contained gold, inclusive of 1.1Mt at 1.5g/t Au for 52.4koz Indicated Mineral Resources and 0.9Mt at 1.1g/t Au for 31.4koz Inferred Mineral Resources.
A cross section at Kamperman illustrating interpreted mineralisation is set out as Figure 5.
Figure 5 – Cross section of Kamperman illustrating interpreted mineralisation.
The mineralisation at Kamperman appears to be present in proximity to a NE trending fault, first interpreted by aerial magnetics (truncation of a strongly magnetic ultramafic body) and, subsequently, supported by drill-hole log interpretation and multi-element lithogeochemistry.
The fault also represents a boundary between the different styles of mineralisation present at Kamperman.Figure 5 above shows the mineralisation style present in the south of Kamperman, which is recognised as a sulphide + magnetite-rich zone hosted in a chloritic “mafic” unit.
A long section at Kamperman illustrating interpreted mineralisation is set out as Figure 6.
Figure 6 – Kamperman long section.
In the north of Kamperman, mineralisation is present as high-grade gold, occurring along lithological contacts (25 metres at 24.3g/t Au from 68 metres in hole FRC378), with multiple lodes of quartz veining, pyrite-bearing silicified porphyry and mineralised minor shear zones.
Rogan Josh Deposit
The maiden JORC 2012 compliant MRE for Rogan Josh is 0.7Mt at 1.3g/t Au for 27.4koz of contained gold, inclusive of 0.5Mt at 1.3g/t Au for 23.3koz Indicated Mineral Resources and 0.1Mt at 1.0g/t Au for 4.1koz Inferred Mineral Resources .
The mineralisation at Rogan Josh appears to sit above a sheared contact between volcaniclastic conglomerate and an intrusive dacitic unit. Supergene enrichment is observed above the shear position. A cross-section at Rogan Josh illustrating interpreted mineralisation is set out as Figure 7.
Figure 7 – Rogan Josh Cross-Section.