Specimen Well Resource
The Specimen Well gold deposit is located 44km north of the historic Gidgee mill. The current Inferred Mineral Resource Estimate for the Specimen Well deposit is 545,000t @ 1.45 g/t Au for 25,400oz (refer to Horizon Gold Ltd ASX announcement dated 4 November 2025). The deposit is currently 750m long, 5 to 25m true width and has not been previously mined (Figure 1).
Figure 1: Specimen Well 3D view looking down to the north-west showing drill holes and OK block model coloured by Au (g/t)
Gold mineralisation occurs in quartz veined, talc-tremolite-chlorite schist and quartz feldspar porphyry on a sheared mafic / sediment contact, strikes north-northeast, is sub-vertical to steeply west dipping, displays a steep south plunge, and remains open to the north and down plunge to the south (Figures 2 and 3).
Selected significant intersections from the deposit include*:
- 11m @ 9.7g/t Au from 8m including 6m @ 17.4g/t Au from 11m (SPRC020)
- 12m @ 1.4g/t Au from 50m including 6m @ 2.6g/t Au from 50m (SPRC040)
- 9m @ 1.4g/t Au from 51m to EOH including 5m @ 2.4g/t Au from 51m (SPRC030)
- 7m @ 1.4g/t Au from 16m including 2m @ 3.0g/t Au from 18m (SPRC024)
- 9m @ 1.1g/t Au from 26m including 1m @ 3.8g/t Au from 33m (SPRC034)
(0.5g/t Au lower cut-off, max. 3m internal waste, refer to Horizon Gold Ltd ASX announcement dated 19 December 2022)
Exploration drilling is targeting strike and depth extensions to existing mineralisation with the aim of increasing the current MRE.
Figure 2: Specimen Well long section showing gold intercept gram x metre pierce points and interpreted plunging high-grade gold shoots.
Figure 3: Specimen Well cross section (7027150N) showing mineralised envelope and significant intercepts.
*Refer to Horizon Gold Ltd ASX announcement dated 19 December 2022, “Further impressive broad, shallow and high-grade intercepts returned from RC Drilling”. CPs L.Ryan, M.Gunther, D.Archer.
