Brightstar Resources Diamond Drilling Results Confirm Underground Potential at Yunndaga

Brightstar Delivers Exceptional Underground Gold Results at Yunndaga

Brightstar Resources diamond drilling results have returned spectacular high-grade gold assay results from its latest diamond drilling program at the Yunndaga deposit within the Menzies Gold Project. The results showcase the potential for developing Brightstar's third underground mine, with standout intercepts including 7m @ 5.70g/t Au, including a spectacular 0.6m @ 54.8g/t Au, confirming the deposit's extraordinary underground mining potential.

The ~6,400m drilling program targeted infill and extensional drilling at Yunndaga, which forms part of the company's 0.6Moz @ 1.4g/t Au Menzies Gold Project. With five drill rigs currently active across the company's portfolio and underground operations targeted for CY2026, these results mark another significant milestone in Brightstar's expansion strategy.

Premium Results Showcase Underground Mining Potential

The latest Brightstar Resources diamond drilling results from Yunndaga have delivered exceptional grades that confirm the deposit's potential as a high-grade underground operation. The most significant intercepts include:

Outstanding Diamond Core Results:

• YNRCD25040: 7m @ 5.70g/t Au from 230m, including 0.6m @ 54.8g/t Au from 234.8m
• YNDD25003: 10.6m @ 2.28g/t Au from 217m, including 1.1m @ 11.9g/t Au from 225.6m
• YNRCD25041: 4m @ 2.51g/t Au from 262m, including 1m @ 8.45g/t Au from 265m

These results complement previously announced RC drilling highlights that included 16m @ 8.03g/t Au and 8m @ 6.67g/t Au. Furthermore, the results demonstrate consistent high-grade mineralisation across the deposit.

Historical Mining Excellence

The Yunndaga mine has a proven track record, having historically produced over 270koz of gold at an exceptional average grade of +16g/t Au. This historical performance, combined with modern drilling results, reinforces the deposit's potential for profitable underground operations.

Understanding Visible Gold in Core Samples

One of the most compelling aspects of the Yunndaga drilling program has been the visible gold intersected in three separate diamond core drill holes. This visible gold provides immediate geological confirmation of high-grade mineralisation before laboratory assays are completed.

Educational Context: Visible Gold in Mining Exploration

Visible gold in drill core represents one of the most significant indicators in gold exploration. When geologists can observe actual gold particles within rock samples, it provides immediate validation of economic mineralisation potential.

This phenomenon occurs when gold concentrations are sufficiently high that individual gold particles become visible to the naked eye within the host rock matrix. The presence of visible gold typically correlates with grades exceeding 5-10 grams per tonne, depending on the grain size and distribution of gold particles.

For mining companies, visible gold reduces geological uncertainty and provides confidence in resource estimates. It demonstrates the coarse-grained nature of mineralisation that often indicates higher-grade zones suitable for underground mining operations.

Why Visible Gold Matters to Investors:

• Provides instant confirmation of gold presence in drill core
• Typically correlates with high-grade assay results
• Demonstrates the coarse gold nature of the mineralisation
• Reduces geological risk and increases confidence in resource estimates

The visible gold at Yunndaga appears within quartz veins hosted in strongly silica-sericite altered sediments, on the contact with mafic amphibolite units. This geological setting is characteristic of high-grade Archean lode gold deposits and provides investors with confidence in the continuity and grade potential of the mineralisation.

Accelerated Development Timeline and Next Steps

Brightstar has outlined clear development milestones for advancing Yunndaga from exploration to production. These initiatives build upon the exceptional Brightstar Resources diamond drilling results achieved to date.

Immediate Priorities (Q4 2025):

• Complete Mineral Resource Estimate (MRE) upgrade incorporating latest drilling
• Finalise updated mine design based on infill drilling results
• Declare maiden Underground Ore Reserves for Yunndaga

Near-term Development (CY2026):

• Commence underground mining operations at Lady Shenton deposit
• Advance Yunndaga as the third underground mine in the portfolio
• Continue resource definition and exploration drilling

Management Commentary:

"These diamond drillhole results from Yunndaga mark the completion of another important phase of exploration activity at Menzies, with the RC and diamond drilling completed in order to facilitate the development of Yunndaga as Brightstar's third underground mine targeted in CY2026." – Alex Rovira, Managing Director

Compelling Investment Thesis in Multi-Mine Gold Producer

Brightstar Resources presents a unique investment opportunity as an emerging multi-mine gold producer with significant near-term catalysts. The company's 3.0Moz resource base across Western Australia positions it as a substantial player in the region's gold sector.

Strategic Advantages

The company's strategic positioning is supported by several key factors. Five active drill rigs operate across three key projects (Laverton, Menzies, Sandstone), while existing underground operations continue at Second Fortune and Fish mines.

Additionally, Brightstar demonstrates proven development capability with DFS completed on Menzies and Laverton projects. The company maintains target production of 70,000oz per annum for five years.

Multi-Hub Portfolio Value:

The Yunndaga results demonstrate Brightstar's ability to deliver high-grade discoveries that can translate into profitable underground operations. This supports the company's growth trajectory toward becoming a leading mid-tier gold producer.

Why Investors Should Track Brightstar Resources

Brightstar Resources has positioned itself at an inflection point in the Australian gold sector. Multiple near-term catalysts could significantly impact the company's valuation and production profile.

Key Investment Drivers:

• Immediate catalysts with MRE updates and ore reserve declarations due in coming months
• Production growth from current operations to multi-mine producer by 2026
• High-grade discoveries at Yunndaga supporting premium underground mining economics
• Diversified portfolio across three proven gold districts in Western Australia

The combination of existing production, advanced development projects, and continued exploration success provides investors with exposure to both immediate cash flow and significant growth potential. Furthermore, the company's systematic approach to resource definition and mine development demonstrates the technical capability required to advance from exploration through to production.

With underground operations at Lady Shenton targeted for H1 CY2026 and Yunndaga following as the third underground mine, Brightstar is positioned to become a substantial gold producer in Western Australia's established mining districts. The exceptional Brightstar Resources diamond drilling results, particularly the visible gold intersections and high-grade assays, confirm the deposit's mining potential and support the company's development timeline.

Key Takeaway

Brightstar Resources has demonstrated its ability to discover and develop high-grade gold deposits across multiple projects. With underground operations targeted for 2026 and exceptional results from Yunndaga confirming the deposit's mining potential, investors should closely monitor the company's progression from emerging producer to established multi-mine operator.

Could Brightstar's Multi-Mine Strategy Transform Your Portfolio?

With underground operations targeted for 2026 and exceptional high-grade results continuing to emerge from Yunndaga, Brightstar Resources is positioning itself as Western Australia's next significant multi-mine gold producer. The company's systematic progression from exploration through to production, combined with its proven 3.0Moz resource base across three established mining districts, presents a compelling investment opportunity for those seeking exposure to Australia's gold sector growth story. Discover how Brightstar's accelerated development timeline and exceptional drilling results could impact your investment strategy by exploring the company's full project portfolio and development milestones at brightstarresources.com.au.