Spartan Maps 700 Meters of Vein Depth Under Tungstonia

Spartan Metals Corp. (TSXV: W) said magnetotelluric and DCIP geophysical surveys at the Tungstonia Claims on its 100%-owned Eagle Tungsten-Silver-Rubidium Project in White Pine County, Nevada, indicate the historic veins may continue to depths of approximately 700 meters and outline a related 3.7 km² potential porphyry target.

Spartan Metals Corp. (OTCQB: SPRMF) has put a three-dimensional picture under ground that was last worked with hand tools and headlamps. The exploration company, which also trades as TSXV: W and FSE: J03, said magnetotelluric (MT) and direct-current induced polarization (DCIP) geophysical surveys at its Tungstonia Claims indicate the vein system mined there almost a century ago may continue to depths of up to approximately 700 meters — and that a separate, related target covering roughly 3.7 square kilometers may represent a porphyry system beneath the same claim block.

The Tungstonia Claims sit on the 100%-owned Eagle Tungsten-Silver-Rubidium Project in White Pine County, Nevada. The surveys, the company said, deliver its first three-dimensional dataset beneath those claims, and the results agree with mapped structures, surface geology, surface geochemistry and the projected geological model at depth. In the language of early-stage exploration, that agreement is the point: independent datasets pointing the same way is what converts a geological idea into a drill target.

What MT and DCIP actually measure

Both methods are indirect. Magnetotelluric surveying reads naturally occurring variations in the Earth's electromagnetic field to map how electrically resistive or conductive the rock is, often to considerable depth. DCIP pushes current into the ground and measures both resistivity and induced polarization — the rock's tendency to hold and slowly release a charge, a response commonly associated with disseminated sulphide minerals. Neither technique detects tungsten or silver directly. What they produce is a physical-property model: zones where the rock behaves differently from its surroundings, which an interpreter then ties to known geology.

That is why the corroboration language in Spartan's announcement carries weight. A resistivity anomaly on its own is a shape in a computer model. A resistivity anomaly that lines up with mapped structure at surface, with the geochemical footprint, and with where a geologist had already projected the vein system to go is a considerably more defensible drill pick. Spartan describes Tungstonia as appearing to host a dynamic mineralizing system with potential for multiple styles of mineral deposits — vein-hosted mineralization near surface and, possibly, a larger porphyry-style system below.

The 3.7 km² question

The two targets are not equivalent in what they would mean if drilling confirmed them. The 700-meter depth extension of known veins is an incremental idea with a low burden of proof: workings exist, the mineralized structures are mapped, and the geophysics suggests they do not stop where the old miners stopped. Narrow high-grade veins are hard to mine economically at a small scale, but they are relatively cheap to test.

The 3.7 km² porphyry target is the higher-variance proposition. Porphyry systems are large, typically low-grade, and can host copper, molybdenum, tungsten and precious-metal by-products across a broad volume of altered rock. If a porphyry is present and mineralized, it changes the scale of what Eagle could be. If it is present and barren — a common outcome — the anomaly explains the geophysics and little else. A single hole rarely settles the matter either way. Details of the survey work were published via INN Battery Metals.

Why a tungsten junior gets attention right now

Spartan positions itself as an exploration and development company focused on tungsten and critical minerals in the western United States. Tungsten is unusual among critical minerals in that its industrial case does not depend on batteries or electrification. It is the hardest-to-substitute metal in cutting tools, wear parts, drilling equipment and defense applications, prized for extreme density and the highest melting point of any metal. Western primary production is thin, which is precisely why domestic tungsten claims — even pre-resource ones — attract investor and policy interest that a comparable base-metal prospect would not.

The silver and rubidium in the project name matter for a different reason. Polymetallic potential gives an exploration story more than one way to work, and rubidium in particular is an uncommon line item on a North American claim. None of that, however, substitutes for a drill result. Spartan has geophysical targets and a geological model. It does not have a published mineral resource at Tungstonia, and the announcement describes potential and projection rather than measured mineralization.

Where the shares stand

Spartan's U.S. listing last traded at 0.35 as of the close on Wednesday, September 17, 2026, up 2.67% on the day from a prior close of 0.34, having ranged between 0.33 and 0.35. Volumes in that quotation tier are typically light, and price discovery for a dual-listed junior tends to happen on its home exchange rather than the over-the-counter line.

The broader market backdrop that session was risk-friendly. The S&P 500 tracker (SPY) closed at $762.60, up 1.13%; the Nasdaq 100 tracker (QQQ) closed at $716.92, up 1.73%; and the Dow tracker (DIA) closed at $518.35, up 0.61%. Index strength of that kind helps speculative resource names at the margin, but it is not the variable that decides how a pre-resource explorer is valued. That comes down to whether the company can fund and execute a drill program, and what comes out of the core.

What would change the picture

Three things are worth watching from here. First, whether Spartan converts the geophysical model into a permitted, funded drill program at Tungstonia, and how many holes it plans — the difference between testing the vein extension and testing the porphyry target is a difference in both budget and timeline. Second, how the company finances it; exploration juniors without revenue fund drilling by issuing equity, and the terms of any raise matter as much to existing holders as the assays do. Third, whether the porphyry interpretation survives the first hole.

For now, investors are being asked to price a geophysical interpretation. The 700-meter figure is a projection of where veins may continue, not a reported intercept, and the 3.7 km² target is an anomaly with a geological explanation attached. Both are legitimate reasons to drill. Neither is a deposit yet, and the gap between those two states is where most exploration capital is spent — and where most of it is lost.

Key facts

• Ticker and last price: SPRMF last traded at 0.35, +2.67%, as of the close on Sept. 17, 2026
• Vein depth potential: Approximately 700 meters, per MT and DCIP survey interpretation
• Porphyry target size: 3.7 km² related target identified beneath the Tungstonia Claims
• Project and location: 100%-owned Eagle Tungsten-Silver-Rubidium Project, White Pine County, Nevada

Frequently asked questions

What did Spartan Metals announce at Tungstonia?

Spartan Metals Corp. reported the results of magnetotelluric and direct-current induced polarization geophysical surveys at its Tungstonia Claims. The surveys indicate the veins worked almost a century ago may continue to depths of up to approximately 700 meters, and they identify a related potential porphyry target covering about 3.7 square kilometers. It is the company's first three-dimensional dataset beneath those claims.

What are MT and DCIP surveys?

Magnetotelluric surveying uses naturally occurring electromagnetic field variations to map how electrically resistive or conductive rock is at depth. Direct-current induced polarization injects current into the ground and measures resistivity plus the rock's ability to hold and release charge, a response often linked to disseminated sulphides. Neither method detects tungsten or silver directly; both build physical-property models that geologists interpret.

Where is the Eagle project and who owns it?

The Eagle Tungsten-Silver-Rubidium Project is in White Pine County, Nevada, and Spartan Metals says it is 100% owned by the company. The Tungstonia Claims, where the geophysical surveys were completed, sit within that project. Spartan describes itself as an exploration and development company focused on tungsten and critical minerals in the western United States.

Does this mean Spartan has found a deposit?

No. The results are geophysical interpretations, not drill results or a mineral resource estimate. The 700-meter figure is a projection of where known veins may continue based on anomaly patterns that agree with mapped structures, geology and surface geochemistry. Confirming mineralization at depth would require drilling, and the announcement does not report assay intercepts.

Where do Spartan Metals shares trade?

Spartan Metals Corp. is listed on the TSX Venture Exchange under the symbol W, quoted over the counter in the United States as SPRMF, including on OTCQB, and listed in Frankfurt as J03. The U.S. quotation last traded at 0.35 as of the close on Sept. 17, 2026, up 2.67% from a prior close of 0.34.

Why is tungsten considered a critical mineral?

Tungsten has the highest melting point of any metal and is extremely dense and hard, making it difficult to substitute in cutting tools, wear-resistant parts, drilling equipment and defense applications. Primary production in Western jurisdictions is limited, which is why domestic tungsten exploration projects in the United States attract policy and investor interest disproportionate to their stage.

Sources

• Spartan Metals Geophysical Surveys Indicate Potential Tungsten-Silver Veins Extension at Its Tungstonia Claims, Nevada — INN Battery Metals

Photo: Diogo Miranda · Pexels Licence — source