Highlights
 • Greatland Resources shares rose 8.71% to AUD 10.61 on 30 March 2026.
 • Telfer Mineral Resource increased 150% to 8.0Moz of gold.
 • Combined Telfer and Havieron resources reached 14.9Moz gold and 645kt copper.
 • Measured and Indicated Resources at Telfer grew 163% to 3.8Moz.
 • Maiden high-grade underground resource defined at West Dome.
 • O’Callaghans deposit confirmed as a globally significant tungsten resource.

Greatland Resources Ltd (ASX:GGP) shares climbed 8.71% to AUD 10.61 during the afternoon session on 30 March 2026, as investors responded to a substantial upgrade in the company’s mineral resource base across its key projects. The stock has also advanced 45.34% over the past year, reflecting sustained market confidence in the company’s expanding asset portfolio and development strategy.

Resource Expansion Reinforces Long-Life Mining Potential

Greatland’s latest Mineral Resource Estimate (MRE) as at 31 December 2025 highlights significant growth across its 100%-owned Telfer and Havieron gold-copper projects. The combined resource now stands at 14.9 million ounces of gold and 645,000 tonnes of copper, underscoring the scale of the company’s operations.

The most notable increase came from the Telfer project, where total gold resources rose by 4.8 million ounces to 8.0 million ounces—representing a 150% increase compared to the previous estimate. This growth was supported by extensive drilling activity conducted throughout 2025, with approximately 134,000 metres completed during the year.

In addition to the overall increase, the higher-confidence Measured and Indicated category expanded by 163% to 3.8 million ounces. This classification upgrade is significant, as it provides a stronger foundation for future mine planning and is expected to support the upcoming Ore Reserve update targeted for the June 2026 quarter.

Drilling Success Drives Organic Growth at Low Cost

The resource growth at Telfer was primarily driven by organic drilling success, delivered at a relatively low discovery cost. The company reported that this expansion was achieved efficiently, highlighting the effectiveness of its exploration strategy following the acquisition of the asset.

Multiple resource areas contributed to the increase, including the West Dome Open Pit, which grew by 2.8 million ounces to 4.9 million ounces. The Main Dome Underground also recorded a significant uplift, with resources rising to 2.2 million ounces.

Importantly, a maiden resource was defined at the West Dome Underground project, adding 0.6 million ounces of gold. This high-grade underground zone is expected to become a key focus for future development, given its potential to introduce a new mining front within the broader Telfer operation.

The inclusion of stockpiles and near-mine resources further supports the operational outlook, providing flexibility in feed sources and reinforcing the long-term production profile.

Infrastructure Capacity and Growth Pipeline Support Future Output

Greatland noted that the scale of the Telfer resource base has the capacity to sustain long-term operations, supported by existing infrastructure capable of processing up to 20 million tonnes per annum.

The company also highlighted opportunities to increase utilisation of its underground mining infrastructure, which currently operates below capacity. Higher-grade underground material presents a compelling opportunity, as it offers significantly stronger grades compared to open pit operations.

Looking ahead, the company plans to continue its aggressive drilling program, with more than 100,000 metres of additional drilling scheduled for the second half of FY26. This ongoing exploration is expected to further enhance resource size and confidence levels in future updates.

O’Callaghans Adds Strategic Diversification

In a separate update, Greatland reported a Mineral Resource Estimate for the O’Callaghans deposit, located near Telfer. The project contains 70 million tonnes of mineralisation, including tungsten, copper, zinc and lead.

O’Callaghans has been identified as one of the larger high-grade tungsten deposits globally, adding a new dimension to Greatland’s portfolio. The deposit benefits from extensive historical drilling, with over 71,000 metres completed across 184 drill holes, supporting a predominantly Indicated Resource classification.

The presence of tungsten, which is widely regarded as a critical mineral due to its industrial applications and limited global supply, positions O’Callaghans as a potentially strategic asset within the company’s broader development pipeline.

Market Reaction Reflects Strengthened Asset Base

The sharp rise in Greatland’s share price on 30 March 2026 appears closely linked to the scale of resource growth reported across its projects. The significant increase in gold resources at Telfer, combined with improved confidence classifications and the addition of a globally relevant tungsten asset, reinforces the company’s long-term production potential.

Investors are also likely responding to the implications for future reserve upgrades, particularly with a revised Ore Reserve Estimate expected in the June 2026 quarter. The continued expansion of higher-grade zones and ongoing drilling activity further support expectations of sustained growth.

What This Means for Investors?

Greatland’s latest updates highlight a material strengthening of its resource base, with substantial growth in both volume and confidence levels. The expansion at Telfer, alongside the introduction of O’Callaghans as a strategic asset, provides a broader platform for long-term development.

The combination of large-scale resources, existing processing infrastructure, and continued drilling activity positions the company to potentially extend mine life and enhance operational output. The market’s positive reaction suggests that investors are placing increased value on the company’s ability to convert resource growth into future reserves and production.