Great Southern Mining Gold Discovery Delivers Exceptional High-Grade Results

Great Southern Mining's Latest High-Grade Gold Discovery Delivers Exceptional Results

Great Southern Mining Limited (ASX: GSN) has delivered another impressive batch of results from its Amy Clarke prospect at the Duketon Gold Project in Western Australia. The December 15, 2025 announcement revealed 17 metres at 1.4 g/t gold – the widest intercept recorded to date at Amy Clarke – demonstrating the emerging Great Southern Mining gold discovery's growing potential.

The results build on an already successful exploration programme that has outlined 4.7 kilometres of high-grade intercepts across the prospect. Furthermore, Amy Clarke has positioned itself as a significant new discovery in the highly prospective Duketon region.

Exceptional New Intercepts Expand Discovery Footprint

The latest assay results from Great Southern's October 2025 aircore drilling programme have exceeded expectations with multiple high-grade intersections. However, the company's systematic approach continues to deliver consistent mineralisation across the prospect area.

Key New Results:

• 17m at 1.4 g/t Au from 20m in hole 25ACAC0105, including:
  • 1m at 11.2 g/t Au
  • 4m at 2.2 g/t Au

• 3m at 5.7 g/t Au from 8m and 1m at 3.2 g/t Au from 37m (25ACAC0132)
• 1m at 10.3 g/t Au from 32m (25ACAC0138)
• 2m at 2.9 g/t Au from 9m (25ACAC0144)

These results complement previously announced standout intercepts including 2m at 23.9 g/t Au and 11m at 1.2 g/t Au. Consequently, Amy Clarke has established itself as a legitimate discovery with significant exploration upside potential.

Strategic Location and Infrastructure Advantage

Amy Clarke's location within Great Southern's Duketon Gold Project provides compelling strategic advantages. In addition, the prospect's proximity to existing infrastructure significantly enhances its development potential.

The proximity to existing gold processing infrastructure significantly reduces potential development risks and capital requirements. Furthermore, this strategic positioning enhances any future resource development scenarios for the Great Southern Mining gold discovery.

Understanding Aircore Drilling: Building the Foundation

Aircore drilling represents the first phase of modern gold exploration, using compressed air to extract samples from shallow depths typically up to 40-50 metres. This cost-effective technique allows exploration teams to test large areas quickly and identify mineralised zones for follow-up drilling.

Why Aircore Matters for Investors:

• Low-cost exploration method enabling systematic target testing
• Effective in identifying gold anomalies in shallow weathered zones
• Critical stepping stone to more expensive reverse circulation (RC) drilling
• Defines drill targets for resource estimation programmes

Great Southern's systematic aircore approach has successfully defined mineralisation over 4.7 kilometres of strike length. Consequently, this represents a substantial discovery footprint that warrants significant follow-up investment.

The aircore method proves particularly effective in the Duketon region's geological setting. Moreover, weathered rock near surface often retains gold mineralisation that can be readily detected through this sampling technique.

The method's efficiency allows companies to test multiple geological targets rapidly whilst maintaining drilling budgets. For instance, this makes it an essential tool for early-stage exploration companies operating across extensive tenement positions.

What Makes This Discovery Particularly Significant?

The Great Southern Mining gold discovery at Amy Clarke demonstrates several characteristics that distinguish it from typical early-stage exploration results. However, investors should understand the specific factors that contribute to its emerging significance.

Discovery Characteristics:

• Consistent grade continuity across multiple drill intercepts
• Shallow mineralisation reducing potential mining complexity
• Structural complexity suggesting multiple mineralisation events
• Extensive strike length indicating systematic geological control

The discovery's geological setting provides confidence that mineralisation extends beyond current drill intersections. Furthermore, the structural complexity observed suggests potential for discovery of additional high-grade zones through systematic exploration.

Next Phase: RC Drilling Campaign Planned

With 9 holes still pending assay results, Great Southern's exploration momentum continues building toward a major RC drilling campaign in early 2026. Managing Director Matthew Keane highlighted the company's excitement about follow-up drilling at Amy Clarke, emphasising how mineralisation remains open both along strike and at depth.

GSN is very excited by the shallow, high-grade intercepts recorded to date at Amy Clarke which demonstrate an emerging gold discovery. These results surpass expectations from this very early phase aircore drilling campaign.

2026 Exploration Timeline:

• Q1 2026: RC drilling programme commencing at Amy Clarke
• Immediate focus: Higher-grade zones identified through aircore programme
• Current activity: 90 RC holes completed at Golden Boulder discovery
• Pending results: 7,000 metres of RC drilling awaits laboratory analysis

The company's robust cash position ensures continued exploration momentum throughout 2026. In addition, this provides the financial foundation for aggressive resource development activities across the Great Southern Mining gold discovery portfolio.

Geological Setting Supports Discovery Potential

According to the company's technical analysis, Amy Clarke occurs in a structurally complex setting where a sheared felsic porphyry-sediment contact hosts laminated quartz-sulphide veins and associated alteration. This geological environment typically indicates deformation-driven fluid pathways that can concentrate gold mineralisation over significant distances.

Key Geological Features:

• Structural complexity creating multiple gold-bearing conduits
• Laminated quartz-sulphide veins hosting visible gold occurrences
• Minimal transported cover preserving in-situ mineralisation
• No historical workings suggesting previous explorers overlooked the target

The geological features observed at Amy Clarke align with successful deposits elsewhere in the Duketon region. For instance, similar structural settings have supported economic gold operations throughout the district.

However, the absence of historical workings suggests that previous exploration programmes may have overlooked this particular geological setting. Consequently, this provides additional confidence in the discovery's genuine nature and potential for expansion.

Investment Thesis: Emerging Discovery in Premier Gold District

Great Southern Mining's systematic exploration success at Amy Clarke validates the company's technical approach and strategic land positioning. The discovery demonstrates several compelling investment characteristics that warrant investor attention.

Key Investment Highlights:

• Shallow high-grade gold discovery with 4.7km of defined mineralisation
• Strategic location near existing processing infrastructure
• Systematic exploration approach delivering consistent results
• Strong financial position supporting aggressive 2026 programmes
• 100% ownership of all discoveries and exploration upside

The Amy Clarke discovery occurs alongside the company's broader Duketon Gold Project. Furthermore, this includes the ongoing Golden Boulder discovery where 90 RC holes await assay results.

This multi-target approach provides investors with exposure to several potential development scenarios within a single project area. Moreover, the diversified exploration portfolio reduces individual target risk whilst maximising discovery potential.

Resource Development Pathway:

• Phase 1: Systematic aircore testing (completed)
• Phase 2: RC drilling programme (planned Q1 2026)
• Phase 3: Resource estimation and feasibility studies (contingent on RC results)
• Phase 4: Development decision making (subject to economic analysis)

Why Investors Should Monitor Great Southern Mining

Great Southern Mining has positioned itself as a serious exploration company delivering genuine discovery success in one of Australia's premier gold districts. The Amy Clarke prospect represents just one component of the company's broader exploration portfolio across 100% owned Western Australian projects.

Compelling Tracking Reasons:

• Multiple discovery fronts across proven gold districts
• Proven exploration team delivering systematic results
• Strong cash position funding aggressive 2026 programmes
• Strategic infrastructure access reducing development risks
• Early-stage discoveries with significant expansion potential

The combination of technical execution, strategic positioning, and financial strength positions Great Southern Mining for potential value creation. Furthermore, as exploration programmes advance from discovery toward resource definition phases, multiple value catalysts emerge.

The systematic approach that defined Amy Clarke's mineralised footprint demonstrates management's technical competence in target generation and drilling execution. However, investors should recognise that exploration success requires sustained technical excellence and adequate funding throughout extended drilling programmes.

The Great Southern Mining gold discovery at Amy Clarke represents a legitimate early-stage discovery with substantial expansion potential. With 4.7 kilometres of high-grade mineralisation and multiple exploration fronts advancing simultaneously, the company warrants close investor attention as RC drilling programmes commence in 2026.

The systematic approach that defined Amy Clarke's mineralised footprint demonstrates management's technical competence in target generation and drilling execution. As the company transitions from discovery to resource definition phases, investors gain exposure to multiple value-creation catalysts across a diversified project portfolio in established mining districts.

Want to Capitalise on Great Southern Mining's Discovery Success?

With Amy Clarke delivering 4.7 kilometres of high-grade gold mineralisation and a major RC drilling campaign planned for Q1 2026, Great Southern Mining presents compelling investment opportunities across multiple discovery fronts. The company's systematic exploration approach, strategic infrastructure positioning, and robust cash position provide the foundation for potential value creation as projects advance from discovery to resource definition phases. Discover Great Southern Mining's full project portfolio and explore investment opportunities to position yourself ahead of upcoming value catalysts in one of Australia's premier gold districts.