What Tolu Minerals' (ASX:TOK) Maiden Mt Penck Resource Means for Its Growing Gold and Copper Portfolio in PNG

Sonal Goyal

05 October 2026 06:03 PM AEDT

What Tolu Minerals' (ASX:TOK) Maiden Mt Penck Resource Means for Its Growing Gold and Copper Portfolio in PNG

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Shares in Tolu Minerals Limited (ASX:TOK) rose 5.77% to A$1.375 on 5 October 2026. The move placed the stock among the notable performers in the gold and base metals development segment during the session. Trading activity involves multiple factors beyond any individual corporate announcement.

In context of 5 October market activity, an announcement from Tolu Minerals Limited (ASX:TOK), dated 21 September 2026, remained relevant for investors following the company. Tolu reported a maiden Mineral Resource Estimate of 293,000 ounces of gold at the Mt Penck Gold-Copper Project in West New Britain, Papua New Guinea, which combined with a previously announced 81% increase in the Tolukuma resource took the company's total reported gold Mineral Resources to 1.33 million ounces, more than doubling from 631,000 ounces at the start of September 2026.

Business Model and Operational Footprint

Tolu Minerals Limited is an Australian-listed gold and copper explorer and developer with projects in Papua New Guinea. The company's portfolio encompasses three deposits: Tolukuma (909,000 ounces including a maiden Indicated Resource of 199,000 ounces), Saki (128,000 ounces) and Mt Penck (293,000 ounces).

Tolukuma is the company's immediate priority, with a 75,000-metre near-mine drilling campaign underway using seven rigs. Tolukuma has existing, fully permitted infrastructure and the company is targeting a return to gold production in early 2027. Mt Penck is a coastal project in West New Britain with deep-water port access, approximately 55 kilometres west of Kimbe.

Sector Context

Papua New Guinea has a long history of gold and copper mining, with several world-class deposits including Lihir, Ok Tedi and Porgera representing the scale achievable in the country's mineralised terranes. Coastal projects with port access represent a logistical advantage over highland projects in PNG due to reduced transportation costs and development complexity. Copper-gold porphyry systems are among the most economically significant deposit types globally, and identifying the presence of a potential porphyry target beneath shallow gold mineralisation is a material exploration development for junior developers.

The Announcement

The 21 September 2026 announcement reported the maiden Mt Penck Mineral Resource Estimate of 293,000 ounces of gold from 7.3 million tonnes at 1.2 grams per tonne gold, reported at a 0.5 g/t cut-off and classified as Inferred under the JORC Code 2012. The estimate was prepared independently from historical drilling data.

Mt Penck is a coastal project approximately three hours by road from Kimbe and its deep-water port, with additional water access via an existing wharf at Silavuti. The Mineral Resource sits in the upper 200 metres of a high-sulphidation epithermal system and is open down dip and along strike. Almost all historical drilling stopped above 200 metres depth.

Independent interpretation of geophysical data defines a copper-gold porphyry target, the Kavola Porphyry, measuring approximately 1.6 kilometres by 900 metres with a chargeability halo persisting to at least 400 metres depth. The porphyry target is described as virtually untested by drilling. An Independent Geologist's Report characterised Mt Penck as an Advanced Exploration Project under the VALMIN Code and outlined a staged, two-year program. The company is evaluating funding Options for Mt Penck separately from Capital committed to the Tolukuma restart.

Growth Catalysts

The Tolukuma drilling program with seven rigs and a target return to production in early 2027 provides near-term operational milestones. The maiden Mt Penck resource adds a second project with growth potential and a large-scale porphyry target beneath the shallow gold resource. Coastal access at Mt Penck removes a common logistical constraint for PNG gold-copper developments. A detailed drilling update at Tolukuma is expected in October 2026.

Risks

The Mt Penck Mineral Resource is entirely Inferred and based on historical drilling data; further drilling will be required to confirm continuity and upgrade resource classification. The Kavola Porphyry is a geophysically-defined target that has not been confirmed by drilling; porphyry targets require deep testing and may not always contain economic mineralisation. PNG project development involves sovereign, regulatory, community relations and logistics risks. Production restart at Tolukuma depends on the results of the ongoing drilling campaign and the feasibility of the restart plan. The company is still assessing funding options for Mt Penck, and the structure and terms of any financing are not yet determined.

FAQs

Q: What is the total gold Mineral Resource now held by Tolu Minerals (ASX:TOK)?

A: Following the maiden Mt Penck MRE announcement, Tolu's total reported gold Mineral Resources are 1.33 million ounces, more than double the 631,000 ounces reported at the start of September 2026.

Q: What is the Mt Penck Mineral Resource Estimate?

A: The maiden MRE for Mt Penck is 293,000 ounces of gold from 7.3 million tonnes at 1.2 g/t Au, reported at a 0.5 g/t cut-off and classified as Inferred under JORC 2012.

Q: What is the Kavola Porphyry target?

A: The Kavola Porphyry is a copper-gold porphyry target identified through geophysical surveys beneath and beside the shallow Mt Penck gold resource. It measures approximately 1.6 kilometres by 900 metres with a chargeability halo persisting to at least 400 metres depth. It has not been tested by systematic deep drilling.

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