Great Western
Interpretation of the recently acquired high-resolution gravity and magnetic datasets has identified a major regional structure, termed the Great Western Splay, extending for approximately 25 kilometres in a northwest orientation from the Horse Well Gold Camp.
The shear flexures around the western margin of a major intrusion, defining another significant structural corridor with the potential to host large-scale, shear-hosted gold systems analogous to those already delineated within the Yandal Project area.
First-pass surface geochemical program conducted by GML returned outstanding results, with lag samples assaying up to 24.4 g/t Au, 3.1 g/t Au, 1.9 g/t Au, and 1.5 g/t Au, and soil sampling delineating an 11.5-kilometre primary shear structure that extends both north and south beyond the current grid limits.
Initial geological ground mapping across these anomalous areas indicates that the terrain is highly altered and structurally complex, with multiple shear splays and cross-cutting fault zones characteristics consistent with a large-scale, gold-bearing system. Several additional +100 ppb Au lag anomalies (coincident with +5 ppb Au in soils) were identified in the south-eastern corner of the sampling grid, marking further extensions of the mineralised trend.
This anomalism occurs in a prime structural position on the keel of the Great Western Intrusion, where it is crosscut by major northeast-trending faults, providing ideal conditions for the development of high-grade, structurally hosted gold mineralisation.
Collectively, these results highlight the Great Western Shear Zone as one of the most compelling underexplored corridors within GML’s Yandal Project, with clear potential to host a large-scale gold system analogous to HWGC.
Mustang-Pony Trend
Geophysical data interpretation shows that the Mustang Shear converges with the Celia Shear Zone at the Pony Target to form a larger, combined shear corridor that exhibits a high structural complexity. This complexity is further enhanced by the flexure and kinking of the combined shear corridor around three discrete intrusions - termed Pony, Haflinger, and Colt - and crosscut by a series of northeast-trending structures.
The Mustang Shear Zone extends over a minimum strike length of approximately 22 kilometres, before converging with the Celia Shear Zone in the vicinity of the Pony Prospect. Historical drilling across this area was conducted by Eagle Mining during the mid-1990s, comprising predominantly shallow, vertical, wide-spaced (200m x 200m) RAB and aircore drilling. This early exploration work largely failed to penetrate the transported cover and therefore did not effectively test the underlying primary mineralised structures now interpreted along the Mustang corridor. The combination of extensive strike potential and limited historical testing highlights the significant opportunity for first-pass modern exploration to uncover concealed mineralisation along this underexplored structural trend.
The gold anomalism observed along the Mustang–Celia corridor represents a significant opportunity for GML to delineate shallow, high-value ounces that could meaningfully enhance the Horse Well resource inventory at a relatively low discovery cost.
Dusk ‘til Dawn IRG Targets
The Dusk ’til Dawn Gold Camp was long been recognised as an area of strategic interest, owing to the 108,900 oz Au JORC (2012) Mineral Resource at the Dusk ’til Dawn deposit and the extensive historic aircore drilling that has delineated multiple zones of significant gold anomalism.
Exploration to date has identified two prominent bottom-of-hole (>0.1 g/t Au) gold trends, extending over a combined strike length of approximately 7.5 kilometres. These trends have only been tested by wide-spaced, shallow aircore drilling, leaving substantial scope for resource growth and discovery at depth. The underexplored nature of these mineralised corridors highlights the broader scale potential of the Dusk ’til Dawn Camp within GML’s expanded Yandal portfolio.
The GML exploration team undertook a detailed re-logging program of bottom-of-hole aircore chips across both gold trends at Dusk ’til Dawn, identifying laterally extensive propylitic alteration. This alteration style is characteristic of the peripheral assemblage surrounding large intrusion-related gold (IRG) systems, suggesting that the mineralisation at Dusk ’til Dawn is linked to a broader, intrusion-driven hydrothermal system.
The alteration zones are spatially associated with distinct geochemical zonation patterns, featuring an inner core of Au–Mo–Cu–Bi–Te anomalism, which grades outward into Ag–Sb–Pb–Zn–As enrichment. This zonation pattern is consistent with the halo effect commonly observed in IRG systems and provides strong vectoring evidence toward a concealed mineralised centre.
Complementing this geochemical and alteration analysis, gravity inversion modelling was completed to delineate potential intrusive bodies at depth. The modelling results were highly encouraging, revealing that both the Au–Mo–Cu–Bi–Te assemblage and the propylitic alteration corridors are underlain by deep-seated low-gravity features, interpreted to represent deep sanukitoid intrusives forming the core of the hydrothermal system. These interpreted intrusives are believed to have driven both the alteration and the coincident gold anomalism identified at surface.
Importantly, these targets remain untested by drilling, and the peak geochemical and alteration responses from historic shallow aircore drilling coincide with the surface projection of the modelled gravity lows, making them high-priority drill targets for the next phase of exploration.
