Greatland Gold Havieron Project Feasibility Study Delivers Exceptional Results

Underground mining operations across Australia are experiencing a technological renaissance, driven by advances in extraction methodologies, processing integration systems, and autonomous infrastructure deployment. Within this evolving landscape, the completion of comprehensive feasibility study insights represents a critical milestone for transforming mineral resources into economically viable production assets. These engineering assessments must navigate complex geological conditions, regulatory frameworks, and capital allocation strategies while demonstrating sustainable returns across multi-decade operational timelines.

The intersection of gold and copper mineralisation within underground deposits presents unique opportunities for dual-commodity revenue streams, particularly when existing processing infrastructure can be leveraged to reduce capital intensity. Modern feasibility studies increasingly emphasise operational flexibility through scenario modelling, allowing mining companies to optimise production profiles based on commodity price cycles and market demand patterns.

What Makes the Havieron Feasibility Study Significant for Australian Mining?

The completion of Greatland Gold's Havieron project feasibility study marks a pivotal moment in Australian underground mining development, establishing a new benchmark for integrated gold-copper operations. The study confirms 38.5 million tonnes of ore reserves grading 2.63g/t gold and 0.33% copper, containing 3.3 million ounces of gold and 128,000 tonnes of copper. This positions Havieron as Australia's third-largest underground ore reserve and the largest Australian underground gold reserve outside global major mining companies, trailing only Newmont's Cadia and Tanami operations.

Underground Gold-Copper Operations in Australia's Competitive Landscape

The scale of Havieron's reserves represents a 55% increase in tonnage and 36% increase in contained metal from previous estimates, achieved through conservative pricing assumptions of A$2,500/oz for gold and A$10,141/t for copper. This substantial reserve upgrade demonstrates the project's geological robustness and positions it favourably within Australia's competitive underground mining sector.

Located approximately 45 kilometres east of Greatland's wholly-owned Telfer gold-copper operations in Western Australia, Havieron benefits from strategic positioning within established mining infrastructure. The Telfer processing facility comprises two processing trains with 10 million tonnes per annum nominal capacity each, creating a combined 20Mtpa total processing capacity that can accommodate Havieron ore feeds.

Current Telfer operations are projected to produce 260,000-310,000 ounces of gold in FY26 at an All-In Sustaining Cost (AISC) of $2,400-$2,800 per ounce, providing established operational expertise and cash flow generation to support Havieron development.

Economic Viability Metrics That Define World-Class Projects

Havieron's economic metrics demonstrate world-class characteristics across multiple valuation parameters. The project delivers a post-tax Internal Rate of Return (IRR) of 22.5% at base case metal pricing, escalating to 31.5% IRR at current spot gold pricing levels. These returns are supported by a Net Present Value (NPV₅%) of $2.9 billion post-tax at base case pricing, expanding to $5.4 billion post-tax under spot pricing scenarios.

Furthermore, the feasibility study employs A$4,500/oz long-term gold price assumptions for base case analysis, with sensitivity analysis conducted at current spot pricing of A$6,250/oz. This conservative pricing approach provides investors with confidence in project economics while demonstrating significant upside potential during favourable commodity cycles.

All-In Sustaining Costs (AISC) of $1,610/oz position Havieron within the lowest-quartile cost operations globally, achieved through efficient processing integration with existing Telfer infrastructure and optimised underground mining advancements. This cost positioning provides substantial margin protection during commodity price volatility periods.

What Are the Key Technical Specifications of Havieron's Mine Design?

Havieron's technical specifications reflect sophisticated underground mining engineering designed to optimise resource extraction across a 17-year initial mine life with nine years of steady-state operations. The mine plan encompasses 50.3 million tonnes of ore at 2.52g/t gold and 0.30% copper grades, containing 4.1 million ounces of gold and 153,000 tonnes of copper within the production target.

Underground Mining Architecture and Extraction Methods

The underground mining design prioritises sustainable extraction methodologies capable of accessing ore bodies while maintaining operational safety and environmental compliance. Pre-production capital expenditure totals $1,065 million, incorporating 11% and 3.5% growth allowances to account for construction contingencies and scope expansion requirements.

Post-production expansion capital expenditure of $673 million will be largely funded from Havieron cash flows, enabling mine life extensions and productivity enhancements without requiring external financing. This capital phasing approach reduces development risk while preserving financial flexibility for operational optimisation.

First gold production is targeted approximately 2.5 years after final investment decision (FID), which is expected following receipt of key environmental approvals targeted in FY26. This timeline reflects realistic construction scheduling while accounting for regulatory approval processes and underground development complexities.

Processing Integration Strategy with Existing Telfer Infrastructure

Processing integration represents a cornerstone of Havieron's technical strategy, leveraging existing Telfer infrastructure to minimise capital requirements and accelerate production timelines. Approximately $200 million in plant upgrades (included in pre-production capex) will enhance processing capabilities while improving Telfer ore recovery rates.

These upgrades are strategically planned to avoid interrupting existing Telfer ore processing operations, ensuring continuity of cash flow generation during Havieron development. The integration design enables dual-feed capability, supporting both standalone Havieron operations and combined processing scenarios through advanced automation in mining.

Recovery enhancement protocols implemented through the upgrade programme will benefit both Havieron and Telfer ore streams, creating operational synergies that extend beyond simple capacity sharing. This technical integration establishes a foundation for the hub operation model that maximises infrastructure utilisation.

How Do Production Targets Compare Across Different Operational Scenarios?

The Greatland Gold Havieron project feasibility study evaluates two distinct operational scenarios designed to provide strategic flexibility and demonstrate project economics across varying operational configurations. This dual-scenario approach enables investors to assess conservative base case returns while understanding upside potential through operational integration.

Standalone vs. Hub Operation Models

Havieron Standalone scenario represents the conservative base case, assuming independent operation with Havieron ore exclusively processed through Telfer Mill utilising approximately 35% of total processing capacity. This scenario generates steady-state production of 266,000 ounces of gold and 9,600 tonnes of copper annually at an AISC of $1,610/oz.

Telfer Hub scenario presents an illustrative case where ore from both operations processes through the full 20Mtpa nominal capacity, enabling fixed cost sharing across processing, site services, and sustaining capital. This integration model reduces Havieron's AISC through economies of scale while maximising infrastructure utilisation efficiency.

Mine Life Extension Potential Through Resource Conversion

Significant mineral resources remain outside the current mine plan, providing substantial mine life extension opportunities. Residual mineral resources total 87 million tonnes at 1.1g/t gold and 0.15% copper, containing 3.1 million ounces of gold and 130,000 tonnes of copper.

Additional exploration targets include:

• Breccias and Link Zone areas with relatively less drilling density than the higher-grade Crescent Zone

• Depth extension possibilities as the deposit remains open at depth

• Underground drilling programmes targeting resource expansion and conversion to reserves

• Business improvement initiatives including potential autonomous haulage systems from Havieron to Telfer

Underground conveyor haulage and crushing infrastructure installation represents a significant upside opportunity, expected to enhance economics of additional inventory while supporting extension of steady-state operations and overall mine life optimisation.

What Financial Returns Can Investors Expect from Havieron Development?

Havieron's financial returns demonstrate exceptional cash generation potential across multiple commodity pricing scenarios, establishing the project as a cornerstone asset for long-term investor value creation. The feasibility study confirms robust economics generating steady-state annual free cash flow of $550 million post-tax at base case pricing, escalating to $870 million post-tax at spot gold pricing levels.

Cash Flow Generation Analysis

Undiscounted free cash flow totals $5.4 billion post-tax over the project life at base case metal pricing assumptions, demonstrating substantial value creation potential. At current spot pricing scenarios, undiscounted free cash flow expands to approximately $7.0 billion post-tax, reflecting the project's sensitivity to commodity price appreciation.

Base case metal price assumptions employ A$4,500/oz long-term gold and A$10,141/t copper, providing conservative foundation for financial projections. Spot pricing scenarios utilise A$6,250/oz gold, representing current market conditions and demonstrating upside potential during favourable commodity cycles.

Pre-tax annual free cash flow reaches $739 million at base case pricing and $1,197 million at spot pricing during steady-state operations. This substantial cash generation capability provides financial flexibility for debt service, dividend distributions, and growth capital allocation across the broader Greatland portfolio.

Capital Structure and Funding Framework

Project funding relies on a diversified capital structure designed to minimise dilution while ensuring adequate development financing. Greatland's $750 million cash balance as of September 30, 2025, provides substantial equity contribution without existing debt obligations.

Ongoing cash flow from Telfer operations contributes additional funding capacity, with current production generating significant operating cash flows to support development activities. This internal cash generation reduces external financing requirements while providing operational flexibility.

$500 million corporate debt commitments from a Tier 1 lending syndicate comprising ANZ, HSBC, ING, NAB, and Westpac establish comprehensive financing arrangements. This banking syndicate represents leading financial institutions with extensive mining sector expertise and global capital markets access.

The combination of existing cash, operational cash flows, and committed debt facilities positions Havieron development as fully funded without requiring equity dilution or additional financing arrangements.

How Does Havieron's Reserve Quality Rank Among Australian Underground Projects?

Reserve quality metrics position Havieron among Australia's premier underground gold-copper projects, with ore reserve specifications demonstrating both scale and grade characteristics that define world-class mining assets. The updated reserve estimate reflects conservative metallurgical assumptions and pricing parameters while maintaining substantial exploration upside potential.

Reserve Classification and Grade Distribution

Proven and probable ore reserves total 38.5 million tonnes grading 2.63g/t gold and 0.33% copper, containing 3.3 million ounces of gold and 128,000 tonnes of copper. This reserve classification follows internationally recognised standards and incorporates extensive metallurgical testing, geotechnical analysis, and mining optimisation studies.

Grade consistency across the ore body provides operational predictability essential for long-term production planning and cost management. Gold grades of 2.63g/t exceed Australian underground mining averages while copper grades of 0.33% contribute meaningful by-product revenue streams, aligning with current mineral exploration insights.

Reserve classification breakdown:

• Tonnage increase: 55% expansion from previous estimates

• Contained metal increase: 36% growth in total gold and copper content

• Pricing assumptions: Conservative A$2,500/oz gold and A$10,141/t copper

• Metallurgical recovery: Optimised through Telfer plant integration studies

Resource Conversion Efficiency and Growth Potential

Resource to reserve conversion efficiency demonstrates the geological team's ability to transform exploration success into economically extractable reserves. The current mine plan utilises a portion of total mineral resources, providing significant expansion potential through continued drilling and engineering optimisation.

Exploration upside potential includes multiple targets within the broader Havieron system:

• 87 million tonnes of mineral resources outside current reserves at 1.1g/t Au and 0.15% Cu

• 3.1 million ounces of gold and 130,000 tonnes of copper in additional resources

• Open-depth potential with mineralisation continuing below current resource definition

• Underground drilling access enabling cost-effective resource expansion programmes

This resource inventory provides multiple pathways for reserve growth and mine life extension beyond the current 17-year mine plan, supporting long-term asset value appreciation and operational flexibility.

What Are the Critical Success Factors for Havieron's Development Timeline?

Successful Havieron development requires coordinated execution across multiple technical, regulatory, and operational workstreams. The project's complexity demands systematic risk management while maintaining schedule adherence and budget discipline throughout the development phase.

Regulatory Approval Pathway and Environmental Clearances

Environmental approvals represent the primary gating factor for Final Investment Decision (FID), with key permits targeted for completion in FY26. These regulatory requirements encompass underground development, processing modifications, and integrated operations management across both Havieron and Telfer facilities.

Approval timeline considerations:

• FID timing: Expected following FY26 environmental permit receipt

• Construction duration: Approximately 2.5 years from FID to first gold production

• Regulatory framework: Western Australian mining regulations and federal environmental requirements

• Stakeholder engagement: Indigenous consultation and community liaison programmes

Permitting strategy emphasises early engagement with regulatory authorities and comprehensive environmental impact assessment to minimise approval timeline risks. The integration with existing Telfer operations provides regulatory precedent and operational baseline data supporting approval processes.

Operational Risk Management and Mitigation Strategies

Underground development risks encompass geotechnical stability, hydrological management, and ventilation system performance across varying geological conditions. Extensive geotechnical drilling and modelling programmes provide foundation data for engineering design and risk mitigation protocols.

Processing integration challenges require careful coordination to maintain Telfer operations during upgrade implementation while preparing for dual-feed processing capability. $200 million upgrade investment includes contingency planning and modular construction approaches to minimise operational disruption.

Market risk exposure to gold and copper price volatility affects project economics, though conservative pricing assumptions and lowest-quartile cost positioning provide substantial downside protection. Hedging strategies and contract mining considerations offer additional risk management tools.

How Will Telfer-Havieron Integration Create Operational Synergies?

The strategic integration of Telfer and Havieron operations creates substantial synergistic value through infrastructure sharing, cost optimisation, and technical expertise consolidation. This hub model maximises asset utilisation while generating economies of scale across both operations, reflecting broader industry innovation trends.

Multi-Mine Production Planning and Optimisation

Integrated production planning enables optimisation of ore blending, processing schedules, and infrastructure utilisation across both operations. Full 20Mtpa mill capacity utilisation through combined feed streams reduces unit costs while maximising revenue generation potential.

Resource drilling programmes support integrated planning objectives through 240,000-meter Telfer drill programme planned for FY26. This exploration initiative targets:

• West Dome Open Pit life extensions

• Main Dome Underground resource expansion

• West Dome Underground Project development opportunities

• Updated Telfer Mineral Resource targeted for March 2026 quarter

• Updated Telfer Ore Reserve targeted for June 2026 quarter

Multi-year integrated production outlook targeted for FY27 will establish comprehensive development and production schedules across both operations, optimising capital allocation and operational sequencing.

Infrastructure Sharing and Cost Optimisation Benefits

Fixed cost allocation across dual operations substantially reduces unit costs through economies of scale. Processing, site services, and sustaining capital costs distribute across higher production volumes, improving overall project economics and operational efficiency.

Shared services optimisation includes:

• Processing infrastructure: Full utilisation of 20Mtpa capacity

• Site services: Maintenance, administration, and technical support

• Sustaining capital: Equipment sharing and coordinated replacement programmes

• Technical expertise: Geological, metallurgical, and engineering teams

Autonomous haulage potential between Havieron and Telfer represents a significant technology advancement opportunity. Automated transport systems reduce operating costs while improving safety performance and operational consistency across the integrated operations.

This infrastructure sharing model creates sustainable competitive advantages through cost reduction, operational efficiency, and technical innovation implementation across both mining operations.

What Does This Mean for Australia's Gold-Copper Production Landscape?

The development of Havieron represents a significant contribution to Australia's gold and copper production capacity, establishing a new benchmark for integrated underground mining operations. With steady-state production targets of 266,000 ounces of gold and 9,600 tonnes of copper annually, Havieron will rank among Australia's premier gold-copper producers.

Strategic Positioning Within Global Supply Chains

Australian underground mining sector benefits from Havieron's technical advancement and operational integration model, demonstrating successful infrastructure reuse and brownfield development strategies. The project's lowest-quartile cost positioning enhances Australia's competitive position within global gold and copper markets.

Paterson Province development gains momentum through Havieron's success, potentially attracting additional exploration investment and infrastructure development across the region. This geographic concentration creates opportunities for shared services, technical expertise, and supply chain optimisation.

Long-term supply security for gold and copper markets receives substantial support through Havieron's 17-year mine life and extension potential through additional resources. The project's scale and grade consistency provide reliable production forecasting for downstream consumers and market participants.

Investment Implications for Resource Sector Stakeholders

Production growth trajectory positions Greatland as a significant Australian gold producer, with combined Telfer-Havieron operations potentially exceeding 500,000 ounces annually under integrated scenarios. This production scale attracts institutional investor interest and supports index inclusion considerations.

Capital allocation efficiency demonstrates successful brownfield development strategies that maximise existing infrastructure investment while minimising greenfield development risks. This model provides template applications for other Australian mining companies seeking growth opportunities.

However, the Greatland Gold AGM presentation emphasises that portfolio diversification benefits through dual-commodity exposure to gold and copper markets provide revenue stability and market cycle protection. Copper production of 9,600 tonnes annually captures exposure to electrification and renewable energy demand growth while gold production provides portfolio diversification and inflation protection.

For instance, the ASX announcement detailing project updates confirms the strategic importance of these developments within Australia's evolving mining landscape, positioning Havieron as a transformational asset for both Greatland and the broader industry.

Disclaimer: This analysis is for informational purposes only and should not be considered investment advice. Mining project development involves substantial risks including regulatory, operational, and market uncertainties. Readers should conduct their own due diligence and consult qualified professionals before making investment decisions. Production targets, financial projections, and development timelines are subject to various risks and uncertainties that may cause actual results to differ materially from those discussed in this analysis.

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