Osisko Metals Drills 4.7% Copper Under Old Gaspé Mine

Osisko Metals (TSX: OM; US-OTC: OMZNF) said new drilling at its Gaspé Copper project in eastern Quebec returned 4.7% copper beneath the past-producing mine's existing workings and extended known mineralization; the OTC line last traded at 1.23, down 0.81% on Sept. 10, 2026.

Osisko Metals Inc. (US-OTC: OMZNF; TSX: OM) has drilled 4.7% copper below the historic workings at its Gaspé Copper project in eastern Quebec, a result the company says extends known mineralization at the past-producing mine.

For a deposit whose commercial life was built on bulk-tonnage, low-grade material, a number with a decimal point in front of the whole percent is the kind of result that changes the conversation. Gaspé was mined for decades as a large, disseminated copper system. A 4.7% copper intercept is an order of magnitude removed from the sort of grade that historically justified milling rock there, and it lands in a part of the deposit — beneath the old workings — that previous operators had limited reason to test.

What a 4.7% intercept actually signifies at Gaspé

Grade is the single most important variable in the economics of a copper mine, because almost every cost in the chain — hauling, crushing, grinding, flotation — is paid per tonne of rock, while revenue is earned per tonne of metal. Doubling grade does not double costs; it roughly halves the rock you must move to produce the same amount of copper. That is why a high-grade zone inside a large low-grade system carries influence out of proportion to its tonnes.

The company has not, in the material available, disclosed the length of the intercept, the depth at which it was cut, or how much of the drilled interval carried that grade. Those details matter enormously. A 4.7% copper assay over a metre is a geological signpost; the same grade over tens of metres is a mine plan. Until Osisko Metals publishes the full intervals, the honest reading is that the result confirms high-grade copper exists below the historic mine and that the mineralized envelope is bigger than previously mapped.

The second element of the announcement — that drilling extended mineralization — is arguably the more durable one. Extensions are what convert a static historical resource into a growing one. They also tend to be cheaper to add than greenfield discoveries, because the drill collars, roads, power and geological database already exist from the mine's producing years.

Why brownfield copper in Quebec has an audience

Past-producing copper mines in stable jurisdictions have become an unusually crowded corner of the exploration market, and for reasons that have little to do with geology. Permitting timelines for entirely new open pits in North America stretch for years. A site with prior industrial use, existing disturbance and a documented mining history compresses parts of that process, and it gives engineers a set of metallurgical answers that a virgin deposit does not.

Quebec adds its own arguments: established mining law, hydroelectric power, road and rail access on the Gaspé peninsula, and a provincial policy stance that has treated critical minerals as an industrial priority. Copper sits on the critical-minerals lists of both Canada and the United States, chiefly because grid buildout, electrification and data-centre construction all consume it in volume and there is no substitute at scale.

None of that removes the hard parts. Old workings mean legacy ground conditions, historical tailings, and water management obligations. Drilling beneath a mined-out zone is technically fiddly. And a project's ability to attract construction capital ultimately depends on a feasibility study, not on a single assay, however eye-catching. Canadian Mining Journal reported the drilling result and the extension of the past-producing mine's mineralization.

How the shares are trading around the news

The US over-the-counter line, OMZNF, last traded at 1.23, down 0.81% on the day from a prior close of 1.24, with an intraday range of 1.21 to 1.25, as of 20:00 GMT on Sept. 10, 2026. That is a quiet tape for a company reporting high-grade copper, and it says something about how the market treats single-hole results: as an input, not a re-rating event, until the assay tables and a resource update follow.

Context helps. The broad market was soft the same session. The S&P 500 proxy SPY traded at $757.89, off 0.59%; the Nasdaq 100 proxy QQQ was at $708.69, down 1.06%; and the Dow tracker DIA sat at $520.75, lower by 0.63%. Against a market down across all three benchmarks, a fractional decline in a small-cap explorer's thinly traded OTC quote is close to noise. Investors watching the name should note that liquidity on the US line is typically a fraction of the TSX listing, and the OTC price can lag or overshoot the Canadian market on any given day.

The specific disclosures that will decide this story

Several concrete items would move Gaspé from an interesting drill hit to a quantifiable change in value, and each should be dated and checked as it arrives:

• Full intercept tables. Grade times width, and how the 4.7% zone sits within the broader mineralized interval. Width is the missing variable in every economic scenario right now.
• Depth and geometry. How far beneath the historic workings the zone lies, and whether it is a discrete high-grade lens or a grade shell within the disseminated system. That determines whether the answer is underground mining, a pit deepening, or neither.
• Continuity between holes. One hole is a point. Two or three that line up define a target with tonnage potential.
• Resource update. Any restatement of contained copper, and critically, whether average grade moves higher when the new zones are folded in.
• Funding. Drill programs consume cash. How Osisko Metals pays for the next phase — treasury, equity issue, or a partner — bears directly on dilution for existing holders.

Reading the result without overreading it

The reasonable framing is that Osisko Metals has demonstrated that Gaspé's mineral system does not stop where the old miners stopped. Historic operations were designed around the economics and metal prices of their era; zones that were uneconomic then, or simply never drilled because they sat below the planned pit floor, are legitimate targets now.

What a single 4.7% copper hit cannot do is establish scale. Copper projects are judged on contained tonnes of metal, strip ratio, recovery and capital intensity, and none of those are yet defined by the information disclosed. Shareholders should treat the result as evidence that the drill program is pointed in the right direction, and wait for the assay tables and any resource restatement before assigning it economic weight. On the tape, the market appears to be doing precisely that.

Key facts

• Drill result: 4.7% copper beneath the historic Gaspé workings, eastern Quebec
• Listings: TSX: OM; US-OTC: OMZNF
• OMZNF price: 1.23, -0.81% on the day, as of 20:00 GMT Sept. 10, 2026
• Project status: Gaspé Copper is a past-producing mine; drilling extended known mineralization

Frequently asked questions

What did Osisko Metals report at Gaspé Copper?

Osisko Metals reported new drilling at its Gaspé Copper project in eastern Quebec that returned 4.7% copper from below the historic mine workings. The company said the drilling extended known mineralization at the past-producing operation. Full intercept widths, depths and any resource implications were not detailed in the initial announcement.

Where is the Gaspé Copper project?

Gaspé Copper sits in eastern Quebec, on the Gaspé peninsula. It is a past-producing copper mine, meaning it operated commercially in the past and has existing infrastructure, historical drilling data and prior industrial disturbance on site, factors that can shorten permitting and de-risk metallurgy compared with a wholly new deposit.

How does Osisko Metals trade?

Osisko Metals is listed on the Toronto Stock Exchange under the symbol OM and trades in the United States over the counter as OMZNF. The OTC line last changed hands at 1.23, down 0.81% from a prior close of 1.24, with a day range of 1.21 to 1.25 as of 20:00 GMT on Sept. 10, 2026.

Why does a 4.7% copper grade matter?

Mining costs are largely incurred per tonne of rock moved and processed, while revenue depends on the metal contained. Higher grade means less rock handled for the same copper output, improving margins. Gaspé was historically mined as a large, low-grade disseminated system, so a 4.7% intercept is materially above the type of grade that supported past production.

Does this drill result change Gaspé's resource size?

Not yet in any quantified way. A single high-grade assay confirms mineralization exists beneath the old workings and that the mineralized envelope extends further than previously mapped, but tonnage requires intercept widths, hole-to-hole continuity and a formal resource estimate. Investors should wait for the full assay tables and any resource update before assigning economic value.

How did broader markets trade on the same day?

All three major US benchmarks were lower on Sept. 10, 2026. The S&P 500 tracker SPY traded at $757.89, down 0.59%; the Nasdaq 100 tracker QQQ was at $708.69, off 1.06%; and the Dow tracker DIA stood at $520.75, down 0.63%, as of 20:00 GMT. Against that backdrop, OMZNF's small decline was broadly in line.

Sources

• Osisko hits 4.7% copper beneath Gaspé workings — Canadian Mining Journal

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