Tāiko Critical Minerals has completed the final resource estimate for its Barrytown project, taking the project-wide inventory to 35.0 million tonnes. The result strengthens the base for feasibility work, but the extension still depends on consent and further drilling to address sampling uncertainty.
- 35.0Mt Barrytown resource, including 34.1Mt Measured and Indicated
- Cargill South contributes 9.7Mt at 11.2% VHM
- Resource contains 2.29Mt ilmenite, 3.20Mt garnet and 50kt zircon
- Fast-track consent decision expected by 8 December 2026
- Competent Persons recommend more sonic drilling and a block-specific pit optimisation
Barrytown resource reaches 35 million tonnes
Tāiko Critical Minerals Limited (NZX:TCM) has completed the last of four resource estimates at its Barrytown heavy mineral sands project, giving the West Coast development a project-wide inventory of 35.0 million tonnes. The estimate comprises 34.1Mt in the Measured and Indicated categories and 0.9Mt classified as Inferred, with the detailed resource table reporting 15.9% valuable heavy minerals (VHM) and 21% total heavy minerals (THM) across the total inventory.
The new Cargill South estimate accounts for 9.7Mt at 11.2% VHM, including 9.3Mt at 11.5% VHM in the Measured and Indicated categories. Its reported content includes 400,000 tonnes of ilmenite, 680,000 tonnes of garnet and 9,000 tonnes of zircon. Across Barrytown, the company reports 2.29Mt of ilmenite, 3.20Mt of garnet and 50,000 tonnes of zircon.
The company says the Measured and Indicated portion is important because it is intended to underpin economic studies. Chief executive Robert Brand described the JORC Code 2012-compliant work as providing confidence in the mineral inventory and said the resource, alongside the pending approvals process, would form a foundation for a feasibility study.
Cargill South adds a lower-grade resource block
Cargill South covers 92 hectares at the southern end of Tāiko’s 1,250-hectare mining permit. The estimate is based on 198 aircore holes and 12 sonic holes drilled during 2025, with the broader project exploration programme involving 11,632 metres of drilling and 11,133 samples tested.
At Cargill South, the Measured category contains 4.3Mt at 16% THM, while the Indicated category contains 5.0Mt at 13% THM. The Inferred component adds about 0.4Mt at 7% THM. The resource is reported above a 1% in-situ ilmenite cut-off and within the 45-micrometre to 2-millimetre sand fraction.
The block is not the richest part of Barrytown on the detailed VHM measure. Barrytown Farms carries 13.5Mt at 19.9% VHM, while Canoe Creek contains 3.4Mt at 21% and Coates South 8.4Mt at 12.4%. Cargill South nevertheless completes the current four-block resource picture and extends the project’s defined mineralised footprint across more than 5 kilometres of strandline.
Fast-track consent remains the immediate gate
The resource does not yet translate into permission to mine. Tāiko’s application to extend the project into Canoe Creek, Barrytown Farms and Cargill South is being assessed under New Zealand’s Fast-track Approvals Act 2024, with a decision due on 8 December 2026, subject to delays. The company already holds consents for Coates South and for its planned wet concentrator and mineral separation plant at Rapahoe.
That regulatory timetable has remained intact after Tāiko submitted its response to expert panel comments in October, as reported in the Fast-track consent response. The filing itself does not indicate whether the panel will approve the extension. Until that decision arrives, the new resource remains an inventory with development potential rather than an operating asset; Tāiko says it is still pre-revenue.
Aircore bias leaves technical work unfinished
The technical report is notably less tidy than the headline resource number. Comparisons with the 12 sonic twin holes found that aircore samples understated heavy mineral grades by about 6% to 16% in the high-grade sand domain and by 6% to 7% in the high-grade dredged domain. In lower-grade domains, aircore grades could instead be overstated.
The Competent Persons considered the data adequate for Inferred and Indicated resources, and used a kriging method designed to give greater weight to the sonic results in the high-grade domains. They also classified some blocks as Measured, while acknowledging that those blocks may still carry a heavy mineral grade bias of up to four percentage points. They recommend increasing the sonic twin proportion to at least 20%, compared with roughly 6% to 7% currently.
Other assumptions remain inherited from neighbouring blocks rather than tested specifically at Cargill South. The cut-off, mining and metallurgical parameters draw on studies of Coates South and Canoe Creek, while a Cargill South-specific pit optimisation is still required before an Ore Reserve can be estimated. High groundwater, environmental management and the outstanding consents add further conditions to the eventual development case.
Bottom Line?
The 35Mt inventory gives Tāiko a larger platform for feasibility work, but the next value-defining steps are regulatory approval, stronger sonic control of the grades and a Cargill South-specific mine study.
Questions in the middle?
- Will the Fast-track expert panel grant the consents needed to mine the three resource extension blocks by the expected 8 December decision?
- How will additional sonic drilling change the grade confidence and classification at Cargill South?
- Can a block-specific pit optimisation and feasibility study convert the resource inventory into an economically defined development plan?