Pursuit Minerals Logs 809mg/L Lithium at Salta's Mito Prospect

Pursuit Minerals reported a lithium brine grade of 809mg/L from packer testing over the 399.2m to 404.0m interval in drill hole DDH-3 at the Mito prospect, part of its Salta lithium project in Argentina.

Pursuit Minerals has reported its strongest lithium brine grade to date at the Mito prospect within its Salta lithium project in northern Argentina, with packer testing returning 809mg/L lithium across the 399.2m to 404.0m interval in drill hole DDH-3.

The result, disclosed in reporting by Stockhead Resources, comes from a discrete 4.8-metre window near the base of the hole rather than an averaged column, which is an important distinction when reading brine numbers.

What a packer test actually measures

In hard-rock exploration, an assay tells you how much metal sits in a lump of core. Brine is different. The lithium is dissolved in salty groundwater held in the pore space of sediments beneath a salar, and the number that matters is concentration in solution — milligrams of lithium per litre of brine.

A packer test is the tool used to isolate that. Inflatable seals, or packers, are set above and below a chosen section of the drill hole, sealing off everything else. Brine is then drawn only from the zone between them. The advantage is precision: the 809mg/L figure is attributable specifically to the 399.2m to 404.0m interval, not to a blended sample that could be diluted by weaker horizons higher in the hole or contaminated by drilling fluid.

That precision cuts both ways for investors. A high packer result confirms that a genuinely strong horizon exists at depth, but it says nothing on its own about how thick that horizon is laterally, how much brine the host sediments will actually give up, or whether the same concentration persists across the tenement. Those are separate questions, answered by more holes and by pumping tests.

Grade is only one of three variables in a brine project

The lithium brine business runs on three numbers, and grade is only the first. The second is porosity — specifically drainable or specific yield, the fraction of brine a sediment will actually release under gravity or pumping, as opposed to clinging to grain surfaces. A gravel or coarse sand with high drainable porosity is worth far more than a clay of identical grade. The third is permeability, which governs how fast brine flows to a well and therefore how many wells a plant needs to stay fed.

Argentina's salares in Salta, Jujuy and Catamarca have hosted commercial lithium production for decades precisely because they combine reasonable concentrations with favourable evaporation conditions and, in the best cases, coarse host sediments. The economics of the Lithium Triangle have always rested on that combination rather than on grade alone. Projects with headline concentrations that never translate into flow rates have historically been the ones that stall between discovery and construction.

So the honest reading of 809mg/L at Mito is that it clears a meaningful bar on the first of the three variables. The follow-through work — pump testing, specific yield measurement, step-out drilling to establish continuity — is what converts a grade number into a resource estimate, and a resource estimate into a development decision.

Where this sits against the Argentine peer group

Comparisons between brine projects are notoriously slippery. Operators report differently: some quote maximum values from isolated intervals, some quote weighted averages over the full brine column, some quote pumped-well concentrations after months of production. A single-interval packer result and a resource-wide average are not the same animal, and stacking one against the other flatters the wrong project.

The useful framing for Mito is internal rather than external. The 809mg/L figure is described as a high score for Pursuit at the project, meaning it exceeds what the company has previously recorded there. Rising grades with depth are a recognised pattern in salar systems, where denser, more concentrated brine can accumulate in lower horizons. If deeper drilling at Mito continues to return stronger concentrations, the practical consequence is that the company's target zone shifts downward, which changes well design, drilling cost per hole and the depth profile of any future production field.

Against the broader Argentine backdrop, the relevant peer question is not whose single sample is highest but whose project can demonstrate a continuous, pumpable body of brine at bankable concentrations. That is the test every aspirant in Salta faces, and it is measured in months of hydrogeological work rather than in single-hole announcements.

What has to happen next for the number to matter

Several things would turn this result into something with balance-sheet consequences.

• Confirmation across holes. A second and third intercept at similar depth and similar concentration would establish that the horizon is a body rather than a pocket.
• Flow data. Sustained pumping tests that show the sediments deliver brine at commercial rates, with concentration holding steady rather than declining as the well draws down.
• Porosity work. Laboratory determination of drainable porosity on core from the productive interval, which feeds directly into any resource tonnage calculation.
• A resource statement. Only once volume, porosity and concentration are all defined can a lithium carbonate equivalent tonnage be published to a recognised reporting standard.

The wider market backdrop

Junior lithium developers are pursuing these milestones in a market that has spent a prolonged stretch punishing the sector's capital raisings, as battery-grade chemical prices have fallen well off their peak and downstream buyers have gained leverage over suppliers. Exploration results now compete for attention against an equity market whose enthusiasm sits overwhelmingly with technology and artificial intelligence names.

That gap was visible in the most recent session. As of the close on Friday, 11 September 2026, the S&P 500 tracker SPY finished at $764.29, up 0.85% on the day, while the Nasdaq 100 proxy QQQ closed at $714.88, up 0.87%, and the Dow tracker DIA ended at $525.79, up 0.97%. Broad indices grinding higher does not automatically lift a pre-resource brine explorer in Salta, which trades on its own drilling calendar and on the price the market assigns to future lithium units.

For Pursuit, the near-term reality is straightforward. Mito has produced a grade worth following up. The value of that grade is entirely contingent on whether the next phase of work shows the brine is there in volume and will flow. Investors watching this name should treat 809mg/L as the opening of a data set, not the conclusion of one.

Key facts

• Peak lithium grade: 809mg/L at the Mito prospect
• Tested interval: 399.2m to 404.0m in hole DDH-3
• Project and location: Salta lithium project, Argentina
• Market backdrop (close, 11 Sep 2026): S&P 500 tracker SPY $764.29, +0.85%

Frequently asked questions

What did Pursuit Minerals report at the Mito prospect?

Pursuit Minerals reported a lithium brine concentration of 809mg/L from packer testing across the 399.2m to 404.0m interval in drill hole DDH-3 at the Mito prospect, part of its Salta lithium project in Argentina. The company describes it as its highest grade recorded at the project to date.

What is packer testing and why is it used in brine projects?

Packer testing uses inflatable seals set above and below a chosen section of a drill hole to isolate that zone. Brine is then sampled only from between the seals. This prevents dilution from weaker horizons elsewhere in the hole and from drilling fluid, so the resulting concentration can be attributed to a specific depth interval.

How thick was the interval tested in DDH-3?

The test covered the section between 399.2 metres and 404.0 metres down the hole, a window of 4.8 metres. That is a discrete interval near the base of the hole rather than an average across the entire brine column, which is why it should not be compared directly with project-wide averaged grades from other companies.

Does a high brine grade guarantee a viable lithium project?

No. Lithium brine economics depend on three variables: concentration of lithium in solution, drainable porosity of the host sediments, and permeability, which controls how fast brine flows to a well. A strong grade with poor porosity or low flow rates will not support commercial production. Pumping tests and porosity work come next.

Where is the Salta lithium project located?

The Salta lithium project sits in Argentina's Salta province, part of the South American Lithium Triangle spanning Argentina, Chile and Bolivia. The region's salares have hosted commercial brine production for decades, helped by high evaporation rates and, in the best deposits, coarse sediments that release brine readily to wells.

What milestones would turn this result into a resource?

Pursuit would need confirmation of similar grades in additional holes at comparable depth, sustained pumping tests showing commercial flow rates with stable concentration, and laboratory determination of drainable porosity on core from the productive interval. Only with all three can a lithium carbonate equivalent tonnage be published to a recognised reporting standard.

Sources

• Pursuit Minerals hits 809mg/L lithium high score at Mito — Stockhead Resources

Photo: Patricia Bozan · Pexels Licence — source