Whundo Cu-Zn

The Whundo project (100% owned) is a high-grade brownfield copper-zinc project with significant resource expansion potential. Whundo is a VMS style Resource, which is typically characterised by 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 by has confirmed additional promising prospects including at Austin and Shelby.

Location and Tenure

The Whundo project comprises of two mining licences (M47/7 and M47/9) and a miscellaneous license (L47/163) located approximately 40 km southsouthwest of Karratha in the West Pilbara region of Western Australia, covering an area of approximately 9 km2 within the West Pilbara Mineral Field. Access is via the sealed road to Tom Price heading south from Karratha then onto a mine road into the historical mine site.


The known copper and zinc deposits at Whundo are confined to a single stratigraphic horizon as a series of NW to NNW plunging shoots that outcropped as a sinuous line of discontinuous goethite-hematite gossans that can be traced for some 500 metres along strike. Individual ore shoots have a restricted strike length and are commonly 1-5 metres thick but reach a maximum thickness of 20 metres in the hinge zone of two small upright synclines in the axis of the major synclinal structure where they form the Whundo deposits.

The stratigraphic sequence at Whundo has undergone upper greenschist to lower amphibolite grade metamorphism, and is overprinted, in part, by hornblende hornfels contact metamorphism. These units have been folded about a moderately north plunging (25°-45°) synformal structure.

The West Whundo deposit outcropped as a gossan folded around a synclinal nose. The gossan was about 135 metres in length and up to 10 metres wide in the core of the syncline which plunges shallowly to the north. The gossan was surrounded by chloritic and sericitic schists, and with volcanic rocks present in the sequence.

Secondary copper mineralisation at West Whundo is present in two zones within the syncline; a southern zone centred about 75 metres to the north of the gossan, and a northern zone centred a further 90 metres to the NNE. The southern zone has a diameter of about 60 metres and the northern about 30 metres.

Figure 1: Whundo project location

Previous Exploration

Exploration by Fox Resources Ltd (Fox) in 2006 identified a mineralised zone within the Yannery prospect but peripheral to the historically mined area. This previous work by Fox included RC drilling for a total of nine holes and a fixed loop electro-magnetic (FLEM) survey. The Fox drill sample assay results included:

  • Hole YNRC004 – 10m @ 2.05% Cu from 40m, including 3m @ 6.10% Cu
  • Hole YNRC005 – 1m @ 3.16% Cu from 43m
  • Hole YNRC007 – 10m @ 3.5% Cu from 39m, including 4m @ 8.3% from 41m2

Artemis Resources (ASX:ARV) also undertook reconnaissance drilling to the NW of Yannery in 2018 aimed at testing for a down plunge extension to the mineralisation reported by Fox. One hole proved successful with the following results reported:

  • Hole AWRC077 – 18m @ 0.9% Cu from 53m, including 1.3% Cu from 54m

Figure 2: Local geology of the Whundo project area

2022 Drilling Programme

In early 2022, GreenTech undertook a maiden 4,974m RC drill program at Whundo and Ayshia to test multiple drill-ready targets aimed at growing the existing JORC 2012 compliant resources at Whundo, as well as lateral and deeper extensions to the eastern and western lobes of the Whundo resource.

At Whundo, the Company drilled 25 holes for 3,838m, with significant intersections returning:

  • 32m @ 2.43% Cu from 75mincluding 17m @ 4.37% Cu and 0.46% Zn from 90m, including 7m @ 7.83% Cu0.64% Zn and 0.26g/t Au from 95m in RC0051
  • 62m @ 1.12% Cu1.36% Zn and 0.36g/t Au, including 19m @ 1.6% Cu, 2.27% Zn and 0.51g/t Au from 21m in RC0071
  • 45m @ 1.15% Cu and 2.6% Zn from 23m, including 12m @ 9.17% Zn2.34% Cu and 0.62g/t Au from 52m in hole 22GTRC0081
  • 8m @ 2.65% Cu, 0.64% Zn and 0.11g/t Au from 141m in hole 22GTRC017
  • 10m @ 2.85% Cu and 0.96% Zn from 162m in hole 22GTRC023

Figure 3: VMS deposits, prospects and targets at the Whundo project area

2023 Drilling Programme

Greentech followed up the 2022 drill program with successful drilling in early 2023. This allowed the Company to identify new mineralised events at the Austin and Yannery prospects and to increase its mineral resource estimate (MRE). The assay results from this drilling included the following intercepts;


Hole 23GTRC001

  • 19m @ 0.81% Cu from 225m, including:
  • 7m @ 1.87% Cu from 226m
  • 1m @ 5.4% Cu from 226m

Elevated zinc, gold and cobalt were also intercepted, including:

  • 9m @ 0.285% Zn from 226m
  • 2m @ 1.35g/t Au from 178m
  • 15m @ 0.04% Co from 226m, including 6m @ 0.073% Co from 226m


Hole 23GTRC009

  • 21m @ 2.1% Cu from 22m, including
  • 8m @ 5.2% Cu from 31m, and
  • 3m @ 13.1% Cu from 32m, and
  • 1m @ 23.1% Cu, 37.1g/t Ag from 34m, and
  • 6m @ 0.3g/t Au, 7.7g/t Ag from 31m

Reserves & Resources

The combined Whundo and Ayshia resources are shown in Table 1 below (refer ASX announcement dated 12 April 2023 for full details).

Table 1: Combined Whundo and Ayshia JORC 2012 Mineral Resource Estimate

Ore Type Grade Range category Tonnes (kt) Cu (%) Zn (%) Cu Metal (t) Zn Metal (t) Total



Whundo >0.25 Indicated 4,271 1.05 0.90 44,755 38,334 83,089
  >0.25 Inferred 0.854 1.39 0.45 11,876 3,811 15,685
Ayshia >0.5 Inferred 0.916 1.3 2.3 11,908 21,068 32,976
Total >0.5 Ind & Inf 6,041 1.14 1.05 68,539 63,213 131,752

*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

Figure 4: Whundo / Austin projected section