Projects
Whundo Cu-Au-Zn Project
The Whundo Project is a high-grade brownfield copper-gold-zinc project with significant resource expansion potential. Whundo is a VMS style deposit, and comprises multiple deposits within a cluster. This is evident through the historical discovery of the Whundo, Ayshia and Yannery deposits while recent drilling and subsequent downhole EM has confirmed additional promising prospects including at Austin and Shelby.
Location and Tenure
The Whundo Project comprises two mining licences (M47/7 and M47/9) and a miscellaneous license (L47/163) located approximately 40km south of Karratha in the West Pilbara region of Western Australia, covering an area of approximately 9km2. Access is via the sealed road to Tom Price heading south from Karratha then onto a mine road into the historical mine site.
Prospectivity
The Whundo Project is estimated to contain a JORC 2012 Inferred and Indicated resource of 6.2Mt @ 1.12% Cu and 1.04% Zn, for a total 45,000 tonnes Cu and 39,000 tonnes Zn metal in the Indicated category and a total 24,000 tonnes Cu and 25,000 tonnes Zn in the inferred category (using a 0.2% Cu lower cut-off).
The Whundo Project comprises six discrete Cu-Au-Zn deposits, namely, Whundo East, Whundo West, Austin, Shelby, Yannery and Ayshia. The JORC resources are currently limited to the Whundo East, Whundo West and Ayshia deposits. The Austin, Shelby and Yannery deposits are currently under tested but with potential for significant resource expansion.
The known copper-gold-zinc deposits at Whundo are confined to a single stratigraphic horizon as a series of NW to NNW plunging shoots within chloritic and sericitic schists and which have undergone upper greenschist to lower amphibolite grade metamorphism. The stratigraphic horizon remains open to both the east and west of the Whundo VMS Field. At West Whundo these units have been folded about a moderately north plunging (25°-45°) synformal structure and pre-mining outcropped as a sinuous line of discontinuous goethite-hematite gossans that could be traced for some 135 metres along strike and up to 10 metres wide in the core.
Resources
The Whundo Cu-Au-Zn project has existing JORC 2012 Indicated and Inferred resources of 6.2Mt @ 1.12% Cu and 1.04% Zn1.
Combined Whundo and Ayshia JORC 2012 Mineral Resource Estimate
| Deposit | Grade Range | Category | Tonnes (Mt) | Cu (%) | Zn (%) | Cu Metal (t) | Zn Metal (t) | Total Metal (t) |
| Whundo | >0.25 | Indicated | 4.4 | 1.03 | 0.9 | 45,000 | 39,000 | 84,000 |
| >0.25 | Inferred | 0.9 | 1.4 | 0.5 | 12,000 | 4,000 | 16,000 | |
| Ayshia | >0.5 | Inferred | 0.9 | 1.3 | 2.3 | 12,000 | 21,000 | 33,000 |
| Total | >0.5 | Ind & Inf | 6.2 | 1.12 | 1.04 | 69,000 | 64,000 | 133,000 |
*Numbers and totals are subject to rounding errors
Notes
- Whundo deposit resource reported in 2018 using LME metal prices Cu US$6,058/t, Zn US$2,457/t and using 0.5% CuEq cut-off grade
- Ayshia deposit resource reported using LME metal prices for 6/5/2022; Cu US$9,428/t, Zn US$3,828/t, Au US$1,833/oz, Ag US$22.38/oz and using a 0.5% CuEq cut-off grade
Phase 2 Drill Program
The Stage 2 follow-up drill program is aimed at progressively testing the down-plunge potential of the mineralised shoots at Austin, Ayshia, Yannery and Shelby. The programs comprise a combination of drilling targeting defined conductor plates followed by further DHEM (Down Hole EM) surveys. This program is ongoing and will remain focused on identifying and where possible quantifying new resources. The currently identified and under tested targets Austin Shelby, Yannery and Ayshia present potential to significantly increase existing Cu-Zn resources of 6.2Mt @ 1.12% Cu, 1.04% Zn2.
Exploration Target Defined3
Building on the successful Stage 2 drill program and ongoing geological analysis, GreenTech has defined a Copper-Zinc Exploration Target for the Whundo project. This conceptual target, which extends beyond the current Mineral Resource, ranges from 15 to 23 million tonnes with target grades of 0.9% to 1.4% Copper and 0.2% to 0.4% Zinc. This translates to a significant metal content of 176,500 to 264,800 tonnes Copper and 46,000 to 69,000 tonnes Zinc. The Exploration Target highlights the potential for a substantially larger Cu-Au-Zn mineral system.
Summary Whundo Project Exploration Target – Potential Tonnes and Grade Ranges
| Tonnes Range | Metal | Grade Range | Metal Content Range |
| 15-23Mt | Copper | 0.9 – 1.4% | 176,000 – 265,000 tonnes |
| Zinc | 0.2 – 0.4% | 46,000 – 69,000 tonnes |
Whundo Project Exploration Target – Potential Tonnes, Grade and Metal Content Ranges
| Mineralised Shoot | Tonnage (Mt) | Cu (%) | Zn (%) | Cu Metal (t)* | Zn (t)* | |||||
| Min | Max | Min | Max | Min | Max | Min | Max | Min | Max | |
| Whundo East | 0.06 | 0.09 | 0.7 | 1.0 | 0.10 | 0.15 | 500 | 700 | 70 | 100 |
| Whundo West | 0.1 | 0.2 | 1.0 | 1.5 | 0.2 | 0.3 | 1,400 | 2,100 | 300 | 400 |
| Austin | 3.9 | 5.8 | 0.8 | 1.3 | 0.2 | 0.4 | 40,500 | 60,700 | 11,500 | 17,300 |
| Ayshia | 2.7 | 4.1 | 0.7 | 1.1 | 0.3 | 0.5 | 24,800 | 37,200 | 10,300 | 15,400 |
| Yannery | 0.4 | 0.7 | 0.9 | 1.4 | 0.3 | 0.4 | 5,100 | 7,700 | 1,500 | 2,200 |
| Shelby | 8.1 | 12.1 | 1.0 | 1.6 | 0.2 | 0.3 | 104,300 | 156,400 | 22,500 | 33,800 |
| Total | 15 | 23 | 0.9 | 1.4 | 0.2 | 0.4 | 176,000 | 265,000 | 46,000 | 69,000 |
The Whundo Project exploration targets are conceptual in nature. There has been insufficient exploration to estimate a Mineral Resource under the Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserve, the JORC code (JORC2012). It is uncertain if further exploration will result in the estimation of a Mineral Resource.
The assessment for the Exploration Target utilized the company’s entire drill hole database, comprising 1,135 drill holes for over 83,000m. Geological, geochemical, and geophysical datasets were integrated to extend mineralised domains beyond current drilling limits.
Significant Gold Endowment Identified4
A detailed review of historical drill hole assays at the Whundo project, comprising over 50,000 samples from 1,195 drill holes, has identified a significant gold endowment associated with the Cu-Zn mineralisation at Whundo.
High-grade gold intercepts were reported5, with notable results including:
Whundo
- 1m @ 64.7g/t Au from 47m (drill hole WHDD029)
- 1m @ 12.75g/t Au from 23m (drill hole WHRC256)
- 1m @ 4.8g/t Au from 25m (drill hole WHRC256)
- 1m @ 5.42g/t Au from 4m (drill hole WHRC284)
- 3m @ 1.54g/t Au, 1.7% Cu from 78m, including
- 1m @ 3.67g/t Au, 2.39% Cu from 78m (drill hole WHRC193)
Ayshia
- 10m @ 1.8g/t Au, 3.44% Cu, 3.5% Zn from 35m, including
- 3m @ 3.3g/t Au, 3.6% Cu, 1% Zn from 41m (drill hole AYRC035)
- 4.3m @ 1.8g/t Au, 1.82% Cu, 14.1% Zn from 39.6m, including
- 1.7m @ 3g/t Au, 2.5% Cu, 7.2% Zn from 41.2m (drill hole AYDD095)
- 12m @ 1.86 g/t Au, 1.7% Cu, 2.5% Zn from 43m, including
- 5m @ 3.2g/t Au, 2.6% Cu, 1.2% Zn from 48m (drill hole AYRC016)
- 18.4m @ 1.5g/t Au, 0.8 % Cu, 16.4% Zn from 46.7m, including
- 6m @ 2.1g/t Au, 0.9% Cu, 14.4% Zn from 56m (drill hole AYDD076)
- 4.38m @ 2.1g/t Au, 3.3% Cu, 2.9% Zn 42.92m (dill hole AYDD078)
Following on from the review a search of the inventory of warehoused laboratory sample pulps identified 33 drill holes for which previous analyses had not included gold. These drill holes were from an RC drill program completed in 2018 by previous project holder Artemis Resources Ltd (ASX:ARV)6 and were selected for re-analysis for gold due to their location within or in proximity to the resource footprint of the established Whundo East and West resources. With only 60% of historic drill holes analysed for gold new results are anticipated to further assist in working towards upgrading the current Whundo project MRE of 6.2Mt @ 1.12% Cu and 1.04% Zn7 to include gold resource.
Whundo West Low-Grade Copper Oxide Stockpile
A low-grade stockpile located immediately south of the Whundo East open pit represents low-grade oxidised copper ore excavated from the Whundo West deposit during mining operations conducted in 2007 by Fox Resources.
An estimate of 100,000 tonnes has been calculated following a survey of the stockpile. There are insufficient laboratory analyses undertaken on the stockpile material to determine the range of Cu-Au-Zn grade.
The results from a sample of approximately 100kg of stockpile material sent to BHM Process Consultants in Perth for metallurgical studies to determine the viability of heap leach extraction of the copper was not encouraging. Additional test work is being considered.
Footnotes
- GRE ASX Announcement “Mineral Resource Update – Whundo Copper-Zinc Project” – 12 April 2023 ↩︎
- GRE ASX Announcement “Whundo Copper-Zinc Project Increases Resource Tonnes by 72%” – 12 April 2023 ↩︎
- GRE ASX Announcement “Exploration Target Reveals Large Scale at Whundo Copper” – 25 June 2025 ↩︎
- GRE ASX Announcement “Significant Gold Whundo Copper Project Retraction Statement” – 5 June 2025 ↩︎
- GRE ASX Announcement “New Gold Potential Recognised North of Whundo” – 24 July 2025 ↩︎
- ARV ASX Announcement “High Grade Cobalt, Copper and Zinc Drilled at Whundo” – 11 April 2018 ↩︎
- GRE ASX Announcement “Whundo Copper-Zinc Project Increases Resource Tonnes by 72%” – 12 April 2023 ↩︎