Kantra Copper Limited (ASX:KAN): What Do New Kanmantoo Reserves Reveal About Mine Development?

Aditi Sarkar

28 October 2026 08:49 PM AEDT

Kantra Copper Limited (ASX:KAN): What Do New Kanmantoo Reserves Reveal About Mine Development?

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Highlights

Kanmantoo Ore Reserves increased 31% year on year to 5.2 million tonnes in the October update.
The updated Mineral Resource totals 27 million tonnes containing 190,000 tonnes of copper.
September-quarter copper output reached 3,419 tonnes, the fifth consecutive quarterly increase.
Nugent drilling extended the interpreted mineralised system below the existing mining horizon.
Emily Star received a maiden underground Ore Reserve as development activities progressed.

Kantra Copper Limited (ASX:KAN) operates the Kanmantoo copper mine in South Australia, where underground mining is accompanied by copper-gold drilling. Formerly Hillgrove Resources, the company adopted the Kantra name and ASX:KAN code in September 2026. October disclosures include reserve, production and drilling updates.

Kanmantoo Reserve Estimate Incorporates New Drilling

On 27 October 2026, ASX:KAN reported a Kanmantoo Ore Reserve Estimate of 5.2 million tonnes grading 0.85% copper and 0.20 grams per tonne gold. This represents 44,000 tonnes of contained copper and 33,000 ounces of gold. Against the previous estimate, reserve tonnage increased 31%, contained copper 30% and contained gold 14%. The revised figures are reported after mining depletion, meaning that additions from modelling and reserve conversion more than offset part of the material extracted.

The accompanying Mineral Resource Estimate was 27 million tonnes at 0.71% copper and 0.17 grams per tonne gold, containing 190,000 tonnes of copper and 150,000 ounces of gold. Resource tonnage was 22% above the prior estimate. ASX:KAN also declared a maiden Emily Star underground Ore Reserve of 740,000 tonnes grading 0.91% copper, a separate area being incorporated into development planning. Mineral Resources are not interchangeable with economically mineable Ore Reserves.

September Quarter Provides Operating Context

The company’s 21 October report for the quarter ended 30 September 2026 recorded 3,419 tonnes of copper production. ASX:KAN described this as its fifth consecutive quarter of growth in output. Net group cash flow reached A$14.2 million, up 72% quarter on quarter, while operating mine cash flow was A$32.1 million. Quarterly all-in sustaining cost was A$5.44 per pound of payable copper sold.

Year-to-date all-in sustaining cost stood at A$5.78 per pound, within the company’s 2026 guidance of A$5.75–A$6.25 per pound. Copper production guidance remained 12,750–14,000 tonnes for calendar 2026. These measures distinguish operating performance from geological estimates.

What the Nugent and Spitfire Results Establish

In its 1 October release, ASX:KAN disclosed a Nugent intersection of 70 metres at 1.18% copper and 0.24 grams per tonne gold from 507 metres downhole, including 38 metres at 1.46% copper. The company indicated that Nugent mineralisation extended about 370 metres below the then-current stoping horizon. The reported drilling interval is not necessarily the true mineralised width, and additional drilling is required to interpret continuity and geometry.

At Spitfire, a September announcement reported 30 metres at 1.32% copper and 0.17 grams per tonne gold from 110 metres downhole. These drilling observations supported geological interpretation for the resource update. However, an individual intersection does not establish a commercially extractable deposit or a change in output on its own.

Development Requirements and Uncertainties

The revised resource and reserve estimates depend on geological modelling, cut-off grades, metallurgical recovery assumptions and mine designs. Actual extraction may differ because of dilution, ground conditions, equipment availability and changing input costs. ASX:KAN is also exposed to copper prices and currency movements. Emily Star development, further Nugent evaluation and conversion of resources into reserves will require continued execution and expenditure.

Key Insights

Kantra Copper Limited (ASX:KAN) has published both updated geological estimates and current operating figures, allowing the Kanmantoo mine to be assessed through distinct measures. The October reserve increase reflects changes to the defined mining inventory, while September-quarter production and cash flow describe recent operations. Subsequent results will determine whether further drilling and development translate into additional recoverable material and sustained output.

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