Tolu Minerals (ASX:TOK): Tolukuma Resource Update Shapes Mine Restart Planning

Aditi Sarkar

28 October 2026 03:07 PM AEDT

Tolu Minerals (ASX:TOK): Tolukuma Resource Update Shapes Mine Restart Planning

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Mining

Highlights

Tolukuma reported an updated gold Mineral Resource of 909,000 ounces in September 2026.
The revised estimate includes 199,000 ounces classified as Indicated.
Underground development and processing infrastructure refurbishment form part of restart preparation.
The company is targeting the first quarter of 2027 for initial gold production.
Resource classification, commissioning and project expenditure remain important operational considerations.

Tolu Minerals Limited (ASX:TOK) develops gold and copper exploration Assets in Papua New Guinea, centred on the Tolukuma underground gold and silver mine and its surrounding exploration licences. An updated Tolukuma Mineral Resource announced in September 2026 has expanded the geological basis for mine planning while work continues on underground access, plant refurbishment and the proposed return to gold production. Sustained output under the restart plan is not yet demonstrated.

Updated Tolukuma Estimate Adds Geological Detail

On 16 September 2026, Tolu Minerals (ASX:TOK) reported a Tolukuma Mineral Resource Estimate of 909,000 ounces of gold, an 81% increase from the estimate used for comparison. The updated estimate comprises 4.31 million tonnes grading 6.57 g/t gold, reported above a 3 g/t cut-off. It also includes approximately 3.9 million ounces of silver.

The Indicated category accounts for 199,000 ounces of gold from 0.85 million tonnes grading 7.33 g/t. The remaining gold resource is not in the Indicated category, making geological confidence and further drilling relevant to detailed mine planning. Mineral Resources are estimates of mineralisation; they are not equivalent to Ore Reserves or evidence that all reported material can be mined economically.

The company identifies more than 44 mineralised veins and splays along a corridor extending over eight kilometres. The September resource covers only part of the recognised system. Additional drilling may refine the interpretation of mineralisation, but its contribution to future estimates remains uncertain.

Restart Activities and Exploration Progress

Tolu Minerals (ASX:TOK) has resumed underground development on the 1560 Level and is refurbishing the processing plant and hydro-electric power facilities. These activities support a staged production restart targeted for the first quarter of 2027, subject to completion of infrastructure work and operational readiness. A production target does not establish that commissioning or ramp-up will occur on the proposed schedule.

The June 2026 quarterly update reported 68 drill holes totalling 11,686 metres during the quarter, bringing the reported programme total to 143 holes and 22,975 metres. The company also reported discoveries at Fundoot Splay and Gulbadi Splay. Tolu Minerals (ASX:TOK) is using drilling and underground observations to improve its geological model and help determine development priorities around existing workings.

Exploration extends beyond Tolukuma to the Saki area and other Papua New Guinea tenements. These assets provide additional geological targets, although exploration results and conceptual targets should not be treated as established production capacity.

Cash Position and Execution Considerations

At 30 June 2026, Tolu Minerals (ASX:TOK) reported approximately A$50.0 million in cash and A$9.7 million of exploration and evaluation expenditure for the June quarter. These figures illustrate the expenditure associated with drilling and mine preparation before the proposed restart. Future funding requirements will depend on the pace and cost of development, refurbishment and commissioning.

The company reported a fatal incident involving an employee at exploration licence EL2531 in July 2026. Safety management, investigations and any resulting operational requirements form part of the development context. Other uncertainties include remote-site logistics, infrastructure reliability, geological continuity, recovery performance and the cost of sustaining production after recommencement.

Key Insights

The September resource update gives Tolu Minerals (ASX:TOK) a larger quantified gold inventory to inform its Tolukuma restart programme. The distinction between Indicated and less certain resources remains important, as does the separation of estimated mineralisation from economically recoverable reserves. Progress on underground access, processing infrastructure, cash expenditure and commissioning will provide more direct evidence of operational readiness than a resource increase alone.

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