REsources &
Reserves

Greatland Group Mineral Resource Estimate

On 30 March 2026, Greatland announced its updated Group Mineral Resource Estimate (December 2025 Group MRE), based on a 31 December 2025 information cut-off date comprising 550Mt @ 0.84g/t Au and 0.12% Cu, for a total of 14.9Moz Au and 645kt Cu.

Subsequent to the Group MRE reported on 30 March 2026 (based on drilling up to 31 December 2025) conversion drilling has continued with new drilling completed between 1 January and 31 March 2026 informing an update for the West Dome Open Pit MRE. This resulted in approximately 15Mt of Inferred material successfully being converted into the higher confidence Indicated classification with no material change in total resource tonnes, metal or grade

 There has been no material change to the Havieron MRE since its release in December 2023.

Notes:

• Mineral Resources are reported as at 31 December 2025, with the exception of the West Dome Open pit that is Reported as at 31 March 2026.
• Grades are reported to two decimal places to reflect appropriate precision in the estimate, and this may cause apparent discrepancies in totals.
• Cut-offs for the Telfer MRE are applied based on a NSR using metal prices of A$4,200/oz Au and A$6.50/lb and current site cost and revenue assumptions.
• Between 1 January 2026 and 31 March 2026, a total of 4.7Mt at 0.61g/t Au and 0.12% Cu for 93koz gold and 3.9kt copper were depleted from Resources through active mining or processing of stockpiles:

– 3.6Mt at 0.49g/t Au and 0.07% Cu for 57koz gold and 1.8kt copper in the West Dome Open pit.
– 0.8Mt at 0.59g/t and 0.06% Cu for 16koz gold and 0.6kt of copper have been depleted from stockpiles.
– 315kt at 2.08g/t Au and 0.80% Cu for 18.8koz gold and 2.5kt copper in the Main Dome Underground.

Greatland Group Ore Reserve Estimate

On 29 June 2026, Greatland announced an update to its group ORE which comprised 157Mt at 0.99g/t Au & 0.12% Cu for 5.0Moz Au & 196kt Cu. Telfer’s updated ORE is based on the December 2025 Mineral Resource statement noting that the Havieron ORE was unchanged from prior estimates.

Notes:

1. • Grades are reported to two decimal places to reflect appropriate precision in the estimate, and this may cause apparent discrepancies in totals.
   • The ORE is reported for contained Measured and Indicated Mineral Resource material delivered to the Run-of-Mine (ROM) pad, stockpiles and dump leach pads, and excludes concentrate already produced and gold in circuit in the Telfer process plant.
   • Cut-offs for the Telfer ORE are applied based on a variable break-even calculation using net smelter return (NSR), medium-term metal prices of A$4,000/oz Au and A$6.00/lb Cu and current site cost and operating conditions specific to each ore source. Open pit and underground ore are co-processed through the current Telfer processing plant:

   – West Dome Open Pit: Conventional truck and shovel open pit, ranging $16.7–25.3/t processed, 78–81% gold and 65-78% copper recoveries.
   – Main Dome Underground: Longhole open stoping mining method with stope widths ranging from narrow reef to bulk stockwork stopes. Cut-offs range from $51/t for bulk stoping variable cost to $158/t processed fully costed for narrow reef stoping. Metallurgical recoveries average 90% gold and 94% copper.
   – Dump Leach: Conventional dump leach, $4.9/t average leach cost with 30–50% gold recovery. No copper is recovered from dump leach material.
   – Stockpiles: Conventional truck and loader rehandle, ranging $16.4–17.4/t processed, 78–86% gold and 50–65% copper recoveries..

2. Havieron:
   • Ore Reserves are reported as at 1 December 2025 and is based on the Havieron Mineral Resources detailed above. Grades are reported
     to two decimal places to reflect appropriate precision in the estimate, and this may cause apparent discrepancies in totals. Cut-offs for the Havieron
     Ore Reserve are applied on a break-even cut-off NSR of A$82/t processed, and metal prices of A$2,500/oz gold and A$10,141/t copper, average
     metallurgical recovery of 86.6% gold and 84.4% copper. Ore Reserves are reported within mining shapes based on a sub-level open stoping
     mining method with cemented paste fill. Reported metal was derived primarily from the Crescent Zone, and only the Indicated Mineral Resource
     component thereof. All Havieron Ore Reserves are reported as Probable Ore Reserves, no Proved Ore Reserves are reported.

O’Callaghans Mineral Resource Estimate

Greatland also announces the December 2025 Mineral Resource for the O’Callaghans tungsten-copper-zinc-lead deposit, located 10km south of Telfer. O’Callaghans is one of the largest high-grade tungsten deposits globally and includes significant copper, zinc and lead.

The O’Callaghans MRE totals:
70Mt @ 0.35% WO₃ / 0.30% Cu / 0.57% Zn / 0.28% Pb
for 246kt WO₃, 207kt Cu, 371kt Zn, and 182kt Pb.

The resource is predominantly Indicated (>95%), supported by 71,000m of drilling from 184 holes, and benefits from prior Pre-Feasibility Study work demonstrating technical and economic viability. Its proximity to Telfer provides potential synergies with existing infrastructure, enhancing development options.

Tungsten is recognised as a critical mineral globally, and O’Callaghans represents a strategically important, long-life resource with high-grade material suitable for industrial, aerospace, defence and other critical applications.

Notes:
Mineral Resources are reported as at 31 December 2025, grades are reported to two decimal places to reflect appropriate precision in
the estimate, and this may cause apparent discrepancies in totals. Cutoffs for the O’Callaghans MRE are applied based on a NSR using metal
prices of US$25.74 lb W (equivalent to ~US$450/MTU APT), US$4.54 lb Cu, US$1.27 lb Zn and US$0.93 lb Pb.