Mogotes Metals Gives Rio Tinto 15 Months on Filo Sur: 8 Things to Know

Project Overview

Mogotes Metals (TSXV: MOG | FSE: OY4 | OTCQB: MOGMF) holds the Filo Sur project immediately south of, and along strike from, the Filo del Sol copper-gold-silver discovery being advanced by BHP and Lundin Mining. The ground spans the Argentina-Chile border in the Vicuña district and adjoins the southern limit of the Filo del Sol resource. Filo Sur is the flagship asset and takes priority for funding, with 14,000 meters (m) drilled to date, including 7,000 m in the most recent season.

On August 27, 2026, the company closed a placement by Rio Tinto Canada Inc. and signed the definitive agreements that go with it. Those agreements do more than fund the next program. They put a term on it, and that term is the part of the announcement that governs what Mogotes has to do next.

1. The Placement Terms Come With an 18-Month Warrant

Rio Tinto Canada Inc. subscribed at C$0.70 per unit for gross proceeds of approximately US$15,000,000 (C$21,271,500), which gives it an initial interest of approximately 5% in Mogotes.

Each unit holds one common share and one-half of a warrant, and each whole warrant entitles the holder to buy an additional share at C$1.00 for 18 months from the closing date. Exercised in full, those warrants would bring in up to approximately C$15,193,928 more. Any further Rio Tinto money is therefore at Rio Tinto's election, is not open-ended, and is priced above the placement price.

Two other mechanics attach to the closing. Securities issued under the placement carry a statutory hold period expiring four months and one day from the closing date. Separately, investors holding pre-emptive rights exercised them alongside the placement, and the company issued additional units at the same price, which raised an additional C$5,579,661.50 in gross proceeds.

2. Exclusivity Runs 15 Months & Extends Only by Agreement

Rio Tinto received a 15-month period of exclusivity over Filo Sur, extendable by mutual agreement for a further 6 months.

The exclusivity gives the placement an end date. Its extension is neither automatic nor at Rio Tinto's election, since it requires both parties to agree, which makes 15 months from the August closing the working assumption for anyone planning around it. Rio Tinto also accepted customary standstill restrictions for the duration.

3. A Match Right & a Path to 9.99% Shape What a Rival Would Face 

During the exclusivity period, Rio Tinto has the right to match third-party proposals involving Filo Sur or the subsidiaries that hold it, as well as a top-up right to acquire up to 9.99% of the company on a partially diluted basis.

A match right does not bar a competing approach. It changes the economics of making one because a rival bidding for Filo Sur during the period knows that Rio Tinto can match the same terms. Competitive tension is suspended for the duration, not removed, and it returns when the period lapses.

The top-up right is priced off the market at the time of exercise, at the greater of the 20-day volume-weighted average trading price and a 20% premium to the prior close, and requires approval from the TSX Venture Exchange. Rio Tinto also holds pre-emptive rights to maintain its proportionate position in future financings for as long as the period lasts.

4. The Alliance Supplies Technical Capability, Not a Second Check

The Strategic & Technical Alliance gives Mogotes access to Rio Tinto's exploration capability across Filo Sur rather than a further tranche of capital.

Its stated elements are a joint technical committee advising the exploration program at Filo Sur, application of Rio Tinto's proprietary geochemistry, geophysics, and targeting workflows across the project, and joint efforts to expand the consolidated land position in prospective areas around it. These are inputs into the drill program that must take place inside the exclusivity period, which is the same program that the placement proceeds pay for. 

Mogotes already held multi-method geophysical coverage across Filo Sur before any of this, acquired over several seasons using magnetic and electrical survey methods. The same low-resistivity magnetotelluric signature, an electrical reading used to point at buried mineralized systems, guided exploration at Filo del Sol and appears across the Filo Sur targets, and first-pass drilling on those anomalies had already begun.

5. The Albor Result Is the Baseline the Period Is Measured Against

Final assays at the Albor target returned 180.0 meters grading 0.98% copper equivalent from a depth of 108 m, including 58.0 m at 1.77% copper equivalent from a depth of 111 m.

Deeper in the same hole, a 9.0-meter interval graded 2.84% copper equivalent from a depth of 276 m. Mineralization begins at 108 m, and it forms part of a larger undrilled surface geochemical anomaly with a molybdenum-in-soil signature measuring approximately 400 by 800 m. 

The result does not close out the target. The limits of the mineralization have not been defined by drilling and remain untested to the northwest and southeast along the strike of the Macho Muerto Fault Zone, and at depth. At 287.85 m, the mineralized breccias give way to increasingly potassic-altered wall rock adjacent to a chargeability high, another geophysical signal of buried mineralization, and company geologists interpret that trend as a second, potentially mineralized porphyry target beneath the first. Within Filo Sur, the fault zone extends about 10 kilometers (km), running from the Meseta target in the north through Luz del Sol to Albor, then a further 7 km southeast to the Cruz del Sur porphyry system.

6. The Season Closed With Its Main Targets Still Untested

Drilling at Meseta, Camino, and Cumbre stopped short of planned depths before winter closed the season in May 2026, and the follow-up hole at Albor is not treated by the company as an adequate test of what it was drilled to test. 

Both Meseta holes were abandoned far short of their targeted depths in hard, fractured silica, and the rigs moved to the Luz del Sol targets to make use of the remaining summer months, which leaves Meseta untested. Technical drilling problems stopped the Camino hole well short of the depth needed to reach a magnetotelluric resistivity low, and the weakly mineralized core it returned sends that target back for reassessment. Forecast winter weather ended the season before either Cumbre hole got beyond its first tens of meters, though both cut the clay-and-silica alteration that caps porphyry systems, so both stay priority targets. The Albor follow-up hole was collared opportunistically before assays came back and appears to have crossed the fault zone at a shallow, oblique angle, and the company does not read it as an adequate test of the mineralized breccias.

President and Chief Executive Officer of Mogotes Metals, Allen Sabet, counts the ground the season never reached:

"When I add it all up, we have something like 10 targets at which, in this season, a number of them were zero tested. Like we haven't even tested those ones."

Some of those targets have been tested, but only minimally. The fault zone is the stated focus of the next season, and the corridor that produced both discoveries stays substantially undrilled inside the exclusivity period.

7. Proceeds Are Committed to Filo Sur & the Next Season Is Targeted for November

Placement proceeds are earmarked for work programs at Filo Sur, where drilling takes place during the Southern Hemisphere summer, with the next season targeted for November 2026.

The stated program is to compile the 2025 to 2026 exploration and drilling data, then plan and prioritize offset drilling at Albor to define how far the high-grade breccia extends and to test whether porphyry mineralization exists there in volume. Planning for the 2026 to 2027 season also covers the broader concession package. 

Sabet puts a month on the next drill season:

"We're hunting to kill here, and I think we're going to be able to go pretty hard on the following drill season, which will commence in probably November."

A November start is the first point at which the exclusivity period produces new drill data. Everything before it is compilation and planning against a term that has already begun.

8. The Alliance Is Described as Broader Than the Project It Covers  

The exclusivity covers Filo Sur alone, while both parties have said they intend to explore extending the alliance concept to further mineral belts, including in Kazakhstan.

That is an intent to explore, not an agreement: no term, no timetable, and no second project has been named beyond the belt reference. Mogotes holds an advanced Kazakh asset in Beskauga, Pavlodar Province, where 150 holes and 67,995 m of drilling have been completed, and the company holds a 3-year option covering 100% of the project. Its third asset is Copper Cliffs in Montana, a gold-copper porphyry project held under a 5-year option to enter into a joint venture with a major mining company for up to 60%. Rio Tinto discovered the Copper Cliffs target in 2013.  

Asked where the budget lands when three projects compete for it, Sabet draws the line:

"We are intensely focused. Our money will intensely focus on Filo Sur." 

The commitment is to the bulk of the budget, not all of it. Mogotes describes the other two assets as a de-risking measure and a way to drill during the Northern Hemisphere summer, and both draw a small share of a budget whose priority is fixed on the project the exclusivity names.

Key Takeaway for Investors 

• A defined window now governs Filo Sur, with exclusivity lasting 15 months from the August 2026 closing and extending by a further 6 months only if both Mogotes Metals and Rio Tinto agree.
• Competitive tension is suspended rather than removed, since a right to match third-party proposals and a top-up right of up to 9.99% mean that any rival approach during the period falls within a structure that Rio Tinto can address.
• The starting position is one strong intercept with open edges, given that 180.0 m grading 0.98% copper equivalent from a depth of 108 m sits within mineralization whose limits are undefined along strike in both directions and at depth.  
• The follow-up hole at Albor was not an adequate test, because it appears to have crossed the fault zone at an oblique, shallow angle, while drilling at Meseta, Camino, and Cumbre stopped short of planned depths before the season closed. 
• November is the first checkpoint, as that is when drilling is targeted to resume and when the compiled data from the last season becomes offset holes at Albor and tests of the wider fault corridor.   

Bottom Line 

Rio Tinto has not bought Filo Sur. It has bought a bounded period on terms that let it match anyone who tries and lift its position to as much as 9.99% before the period ends. In exchange, Mogotes gets capital, a technical committee, and a set of targeting tools, all pointed at ground far less drilled than the headline intercept suggests.   

The 2025 to 2026 season ended with two discoveries and with drilling at Meseta, Camino, and Cumbre that never reached the depths it was designed for. The November program has to get through that work, not the Albor assay. The agreements have fixed the calendar. The geology has not yet been fixed.