Mandilla Gold Project
Flagship Project
Astral Resources 100%
The Mandilla Gold Project is situated in the northern Widgiemooltha greenstone belt in the western part of the Kalgoorlie geological domain, some 70 kilometres south of the significant mining centre of Kalgoorlie and 20 kilometres west of Kambalda in Western Australia. The location of Mandilla in relation to Kalgoorlie and other nearby gold projects is set out in Figure 1.
The Project lies on the western margin of a porphyritic granitic intrusion known as the Emu Rocks Granite. The granite intrudes volcanoclastic sedimentary rocks in the project area which form part of the Spargoville Group. Significant NW to WNW-trending structures along the western flank of the project are interpreted from aeromagnetic data to cut through the granitic intrusion and may be important in localising mineralisation at Theia. A second sub-parallel structure hosts gold mineralisation at Iris. In this area, a mineralised footprint extending over a strike length of approximately 700m has been identified.
The Mandilla Gold Project is covered by existing Mining Leases which are not subject to any third‐party royalties other than the standard WA Government gold royalty.
Mineral Resource Estimate (JORC 2012)
On 20 July 2023, the Company announced an updated JORC 2012 Mineral Resource Estimate (MRE) of 37Mt at 1.1g/t Au for 1.27Moz of contained gold, encompassing the Theia, Iris, Eos and Hestia deposits. The MRE was prepared by independent consultants Cube Consulting in accordance with the JORC Code (2012 Edition).
The locations of the optimised pit shells based on a gold price of AUD$2,500 per ounce are set out in plan view in Figure 2 below.
Table 1 – Mandilla Mineral Resource Estimate (July 2023)
| Mineral Resource Estimate for the Mandilla Gold Project (Cut-Off Grade >0.39g/t Au) | |||
| Classification | Tonnes (Mt) | Grade (g/t Au) | Au Metal (koz) |
| Indicated | 21 | 1.1 | 694 |
| Inferred | 17 | 1.1 | 571 |
| Total | 37 | 1.1 | 1,265 |
| 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 – MRE (July 2023) by source
| Deposit | Classification | Tonnes (Mt) | Grade (g/t Au) | Au Metal (koz) |
| Theia | Indicated | 17 | 1.1 | 573 |
| Inferred | 12 | 1.1 | 447 | |
| Total | 29 | 1.1 | 1,021 | |
| Iris | Indicated | 0.4 | 0.8 | 11 |
| Inferred | 4.0 | 0.8 | 103 | |
| Total | 4.4 | 0.8 | 115 | |
| Eos | Indicated | 0.6 | 1.6 | 29 |
| Inferred | 0.5 | 1.3 | 19 | |
| Total | 1.0 | 1.5 | 48 | |
| Hestia | Indicated | 2.7 | 0.9 | 78 |
| Inferred | 0.2 | 0.8 | 4 | |
| Total | 2.9 | 0.9 | 82 | |
| Total | 37 | 1.1 | 1,265 | |
| All tonnages reported are dry metric tonnes. Minor discrepancies may occur due to rounding to appropriate significant figures. | ||||
Table 3 – MRE (July 2023) by cut-off grade
| Cut-off grade (g/t Au) | Tonnes (Mt) | Grade (g/t) | Au Metal (koz) |
| 0.30 | 43 | 1.0 | 1,332 |
| 0.35 | 40 | 1.0 | 1,298 |
| 0.39 | 37 | 1.1 | 1,265 |
| 0.40 | 37 | 1.1 | 1,258 |
| 0.45 | 34 | 1.1 | 1,215 |
| 0.50 | 31 | 1.2 | 1,171 |
| All tonnages reported are dry metric tonnes. Minor discrepancies may occur due to rounding to appropriate significant figures. | |||
Theia Deposit
Theia is the cornerstone deposit at Mandilla, representing approximately 81% of the reported MRE. The total MRE at Theia is 29Mt at 1.1g/t Au for 1.02Moz of contained gold.
Figure 3 below shows the Mineral Resource for Theia within the optimised pit shell in cross-section.
Iris Deposit
The Iris Deposit hosts a MRE of 4.4Mt at 0.8g/t Au for 115koz of contained gold.
Eos Deposit
The Eos Deposit hosts a paleochannel deposit MRE of 0.8Mt at 1.6g/t Au for 41koz of contained gold. Additionally,a maiden Inferred MRE of 0.2Mt at 1.0g/t Au for 7koz of contained gold was reported in the July 2023 MRE.
Section 4, as illustrated in Figure 4 below, shows a cross-section view of both the Eos paleochannel and the new fresh rock MRE.
Hestia Deposit
A maiden Mineral Resource was first declared at Hestia in December 2022. Mineralisation was identified over one kilometre of strike length; however, at that stage the drill density was considered too sparse to support resource estimation over the entire strike length.
As part of the July 2023 MRE Update, Astral reported an MRE of 2.9Mt at 0.9g/t Au for 82koz of contained gold. This represented a 583% increase in resources and a 12% increase in grade. Pleasingly, 95% of the MRE at Hestia is in the higher confidence Indicated category.
Section 5, as illustrated in Figure 5 below, shows a longitudinal projection of Hestia as previously reported on 6 December 2022.
