Pivotal Metals (ASX:PVT) extends Horden Lake strike by 500m, validates EM-driven copper exploration strategy

How has Pivotal Metals expanded the known mineralised footprint of Horden Lake through step-out drilling?

Pivotal Metals Limited (ASX:PVT) has reported encouraging results from its 2025 step-out drill program at the Horden Lake copper-nickel-PGM-gold project in Quebec, extending the mineralised strike by 500 metres and affirming the strength of its electromagnetic (EM)-led targeting strategy. The campaign uncovered high-grade copper-equivalent zones at shallow depths, providing strong support for the company’s goal of developing a large-scale, long-life open pit copper operation.

The Australian exploration and development firm disclosed that all 11 drillholes in the program intersected mineralisation, with assays indicating a continuity of the shallow contact horizon that hosts the existing 37-million-tonne resource graded at 1.1% copper-equivalent (CuEq). Notably, the strike extension brings the total defined length to 2.6 kilometres, with significant open depth potential.

Horden Lake, situated 131 km northwest of Matagami and accessible by road, represents Pivotal’s flagship asset in its Canadian critical minerals portfolio. The June 19 announcement confirms that the highest-grade intersections were located in the two deepest holes, underscoring the potential for further down-dip expansion as well.

What are the assay highlights from Pivotal Metals’ 2025 step-out drill program at Horden Lake?

The standout intercepts from the step-out drilling campaign reaffirm the high-grade nature of the Horden Lake system. The assay results from Pivotal Metals’ 2025 step-out drilling campaign at Horden Lake continue to validate the project’s high-grade profile and geological consistency. Drillhole HN-25-125 intersected a headline-grade peak of 4.3% copper-equivalent (CuEq) over 0.5 metres, nested within a broader 19.5-metre interval grading 0.71% CuEq starting from a depth of 125.2 metres. This was followed by HN-25-127, which recorded 2.3% CuEq across 2.6 metres, also within a wider mineralised section measuring 28.4 metres at 0.57% CuEq from 179.6 metres.

Notably, drillhole HN-25-134 delivered one of the program’s most robust intersections, returning 3.74% CuEq over 0.9 metres as part of a 3.1-metre interval grading 1.41% CuEq from 121.6 metres. This same hole also intercepted an additional mineralised horizon further downhole, consisting of 14.5 metres at 0.45% CuEq from 149.5 metres. Supporting these results, HN-25-126 yielded a continuous intercept of 34.6 metres grading 0.58% CuEq from a depth of 150.5 metres, further underscoring the continuity and scale potential of the shallow gabbro-sedimentary contact zone that defines the Horden Lake system.

The mineralised horizon remains open at depth, and drill core logging confirmed semi-massive and stringer sulphide textures associated with the gabbro-sediment contact zone. These zones are believed to host both primary and remobilised sulphide accumulations, enhancing continuity along strike and down dip.

According to the mineral equivalent calculations published by Pivotal Metals, copper remains the dominant contributor to economic value, with contributions from nickel, gold, palladium, platinum, silver, and cobalt weighted using recovery and pricing assumptions aligned with recent metallurgical testwork.

How does the EM survey support future resource growth and exploration targeting at Horden Lake?

A major technical success emerging from this drilling campaign is the confirmed reliability of fixed loop time domain electromagnetic (FLTEM) surveys and down-hole EM (DHEM) tools for guiding exploration. The conductor targeted in the 2025 program, located just 500 metres from historical drilling, was never previously tested due to limitations in earlier geophysical capabilities.

The targeted shallow conductor exhibited a modeled conductivity of 3,000–5,000 siemens. In comparison, undrilled anomalies beneath the main Horden Lake deposit show conductivities as high as 15,000 siemens and extend to depths well below existing drill intercepts.

With over 50,000 metres of historical drilling and the contact zone now tracked over 3.2 kilometres of strike, Pivotal believes its next exploration stages will benefit from high-conviction EM-led targeting. This is particularly important given that several high-conductivity anomalies remain untouched along both strike and depth extensions of the main deposit.

The use of EM has effectively transformed Horden Lake into a scalable, low-risk growth project with a defined geophysical footprint, according to management commentary included in the June 19 release.

What does the latest mineral resource estimate reveal about Horden Lake’s development potential?

As of April 29, 2025, Pivotal Metals announced an updated mineral resource estimate for Horden Lake. The total resource now stands at 37 million tonnes at an average grade of 1.1% CuEq. This includes 19.5 million tonnes in the Indicated category at 1.17% CuEq and 17.4 million tonnes in the Inferred category at 1.02% CuEq.

Contained copper metal in the deposit totals 234,000 tonnes, supported by 407,000 tonnes CuEq. Nickel content is estimated at 72,000 tonnes, while the project also hosts 435,000 ounces of precious and platinum group metals (3E = Pd + Pt + Au) and 5,231 tonnes of cobalt. In-pit resources comprise the bulk of this estimate, with 31.2 million tonnes falling within the optimised shell using a US$25/tonne NSR cut-off.

Metallurgical testwork has confirmed favourable recoveries: approximately 90% for copper, 50% for nickel, and 50–70% for gold, palladium, and platinum. These are expected to yield clean concentrates grading ~24% Cu and 12% Ni, boosting the project’s economic case for development.

What is the institutional and strategic outlook on Pivotal Metals’ Horden Lake development path?

Institutional investors are likely to view the step-out results and EM validation as critical milestones in de-risking Pivotal’s open pit development thesis. Analysts monitoring the critical minerals sector have noted that scalable, shallow copper systems with significant by-product credits—including nickel, cobalt, and PGMs—are increasingly rare, especially within geopolitically safe jurisdictions like Quebec.

While the project still requires feasibility work, permitting, and further drilling, the combination of scale, grade, and location enhances Horden Lake’s profile as a potentially strategic North American copper-nickel project.

The infrastructure advantage, including road access and the proximity to the James Bay Highway, further reinforces investor confidence in the project’s logistical viability.

The results also arrive at a time when institutional demand for exposure to North American energy transition metals is intensifying. Analysts believe that a multi-metallic copper-nickel-PGM asset with credible scale and geophysical expansion potential could position Pivotal Metals as an acquisition target or a candidate for advanced-stage development partnerships.

What are the next steps for Pivotal Metals in advancing the Horden Lake copper project?

Pivotal Metals plans to initiate further EM surveys and begin drilling other high-conviction conductors located beneath and adjacent to the current resource footprint. The firm also expects to begin work on resource re-modelling to include the 2025 step-out data and assess the feasibility of extending the pit-constrained resource envelope.

Additionally, the company intends to accelerate environmental and engineering studies to support a future pre-feasibility or feasibility-level study. Future drilling will test depth extensions and evaluate whether higher-conductivity zones translate into stronger grades or new satellite deposits.

With strong metallurgical results and demonstrable EM-guided targeting precision, Pivotal Metals is poised to enter the next phase of value accretion through resource growth and project de-risking.