GSN’s shares the Duketon Greenstone Belt with gold producer Regis Resources Limited, which has been successful in the identification of +8Moz of gold resources (refer to RRL’s website). The majority of these deposits reside on major well understood shear zones. GSN’s tenure in the Duketon Greenstone Belt includes significant portions of these shear zones and through the use of magnetic data and geological mapping, GSN immediately identified these shear zones as high priority target corridors, and have aggressively begun to explore these well understood trends. It is interpreted that all three mineralised corridors continue into the company’s tenure with:
- ~8km of the Erlistoun Trend
- ~7km of the Garden Well Trend
- ~11km of the Rosemont-Ben Hur Trend
Golden Boulder
In May 2023 the Company announced the results of a recently completed Air Core (AC) program comprising 3,445m targeting two lines of mineralisation identified as the Golden Boulder Main and the Golden Boulder East trends. Both trends are delineated by historic gold workings which extend for over 3km. Golden Boulder is interpreted to sit along the greater Rosemont trend which hosts Regis Resources’ Rosemont (~1,06Moz Au) and Ben Hur (~390koz Au) deposits and GSN’s Southern Star prospect to the south.
Previous to GSN, drilling in the area was sparse, shallow and untargeted, averaging just 40m below surface.
Results indicate the potential to host economically significant gold mineralisation with both trends intersecting ore grade intercepts and continuous mineralisation over a considerable strike length. All significant intercepts from the recent AC drilling reside within the oxide zone.
Mineralisation has been delineated along three parallel trends, denoted as the Main line, Eastern line and Ogilvies.
Golden Boulder Main
Golden Boulder Main was identified as a high priority drill target when GSN first acquired the tenement (E38/3518) in 2020. Golden Boulder consists of over 50 shallow shafts with a reported historic production of 1,915 tonnes at 28.6 g/t Au for 1,761 ounces of gold (WAMEX report A85278). Chlorite altered sheared basalt with smokey quartz veins appears to host the highest grade gold.
Standout intersections from GSN’s first pass 16-hole drilling campaign in 2021 (Refer to GSN ASX announcement dated 23 September 2021) returned intercepts including:
- 5m @ 3.3 g/t Au from 49m, including 1m @ 12.3 g/t Au and 1m @ 1.2 g/t Au from 73m in 21GBRC0001, and
- 5m @ 1.2 g/t Au from 103m, including 1m @ 4.1 g/t Au in 21GBRC0007.
The 2023 AC drilling was designed to extend the mineralisation along strike to the south, with ~200m spaced lines perpendicular the interpreted mineralised trend. New intersections along the predicted line of mineralisation have increased the strike of Golden Boulder substantially with a 1.6km anomalous gold trend now defined. Significant intersections include:
- 12m @ 1.3 g/t Au from 44m, including 4m @ 2.4 g/t Au 48m in 23GBAC022,
- 12m @ 0.6 g/t Au from 20m, including 4m @ 1.0 g/t Au 24m in 23GBAC057, and
- 4m @ 2.4 g/t Au 44m in 23GBAC059.
Main line mineralisation from 2024 and early 2025 included intercepts as follows:
- 4 m at 2.03 g/t Au from 24 m, including 2 m at 3.5 g/t Au, 5 m at 14.57 g/t Au from 41 m, including 1 m at 70.94 g/t Au, and 2 m at 2.15 g/t Au from 69 m and 1 m at 1.4 g/t Au from 87 m in hole 25GBRC009
- 2 m at 12.56 g/t Au from 99 m, including 1 m at 18.21 g/t Au in hole 25GBRC007
- 3 m at 4.80 g/t Au from 18 m, including 1 m at 12.45 g/t Au hole 24GBRC0007
- 4 m at 5.64 g/t Au from 63 m, including 2 m at 9.89 g/t Au in hole 24GBRC0005
- 3 m at 2.85 g/t Au from 120 m, including 1 m at 5.56 g/t Au in hole 25GBRC011
- 8 m at 1.77 g/t Au from 27 m, including 3 m 2.36 g/t Au and 1 m at 3.17 g/t Au in hole 25GBRC021
- 5 m at 3.30 g/t Au from 49 m
In October 2025, the Company completed a 90 hole RC program. Assay results are pending.
Golden Boulder East
The Golden Boulder East target is defined by a small number of deep workings running parallel to Golden Boulder Main. Drilling targeted a ferruginous and strongly sheared quartz structure within a volcanic unit close to the contact of a ferruginous chert striking NNW-SSE.
This sedimentary chert package is believed to be acting as a trap for gold mineralisation and logging recorded a mixed package of shale and chert bands with gold hosted within the chert horizon.
The standout intercept on the Golden Boulder East trend of 8m @ 3.9 g/t Au from 44m, including 4m @ 6.8 g/t Au 48m in 23GBAC008, is within the chert horizon.
Amy Clarke
Amy Clarke sits in a high strain structural zone with overprinting sericitic alteration associated with shearing and related folding. An extensive gold-bismuth-lithium-tungsten surface geochemical anomaly extends from the northern tenement boundary for approximately five kilometres south . This anomaly is interpreted to lie on the same structural trend that hosts Regis Resources’ Erlistoun open pit mine (320 koz gold) located approximately 3.5 kilometres to the north.
Broad spaced aircore drilling in 2021 defined two mineralised gold trends with better intercepts including:
- 8m @ 6.73 g/t Au from 32m including 4m @ 12.5 g/t Au in 21ACAC147
- 4m @ 2.13 g/t Au from surface in 21ACAC038
- 4m @ 1.23 g/t Au from surface in 21ACAC055
In October 2025 the Company recently completed an 8,057 metre aircore drilling program over a strike length of ~6 kilometres.
Air-core traverses were spaced at 100 to 400 metre intervals, with holes positioned every ~25 m along each fence. Drilling reached an average downhole depth of ~40 m, providing good coverage across the target corridor. This drilling was designed to follow up on 2021 gold intercepts and to test key structural and geochemical targets. Assay results have been received for 80 holes with better results including:
- 2m at 23.9 g/t Au from 10m in hole 25ACAC0007
- 11m at 1.2 g/t Au from 25m, including 6m at 1.7 g/t Au hole 25ACAC0057
- 2m at 1.5 g/t Au from 30m in hole 25ACAC0067
- 5m at 0.4 g/t Au from 1m in hole 25ACAC0089
