By Jamie Hyland, MiningIR
Osisko Gold Group Inc. (NYSE: OGG | TSXV: OGG) has made the formal decision to proceed with full-scale construction of its 100%-owned Cariboo Gold Project in central British Columbia, moving one of Canada’s advanced undeveloped gold projects from development into execution — and potentially changing the investment profile of the wider Cariboo Gold District.
Cariboo has been decades in the making, with a long history of mining and exploration in the Wells-Barkerville camp. The modern systematic exploration and development campaign that ultimately led to today’s construction decision began in 2015, when the current management team commenced extensive drilling and geological work across the project. That was followed by years of resource definition, technical studies, permitting, financing and pre-construction. With the board now formally approving construction, Osisko’s focus shifts from demonstrating that Cariboo can be built to showing that it can deliver the mine on schedule and within its updated capital framework.
That is an important distinction for investors.
“This formal construction decision marks a defining milestone for Osisko Gold and a pivotal step toward becoming an intermediate gold producer. With a strong balance sheet and robust project economics, our focus is now firmly on disciplined execution toward first gold in early 2029.”
— Sean Roosen, Chairman and CEO, Osisko Gold Group Inc.
The transition from explorer and developer to mine builder typically changes how the market evaluates a company. Exploration upside remains important, but increasingly the metrics that matter are engineering completion, procurement, underground development rates, construction milestones, capital discipline and ultimately the successful commissioning of the operation.
Osisko is targeting first gold in the first quarter of 2029, followed by commercial production in the second half of that year.
The company estimates that the project was already approximately 22% complete as of July 31, 2026. Detailed engineering is approximately 40% complete, procurement and commitments for long-lead items are approximately 44% complete, and roughly C$325 million has already been committed.
The remaining go-forward capital obligation is estimated at C$990 million, net of approximately C$272 million already incurred through July 31. That estimate includes a contingency of approximately 16.5% and assumes that roughly C$117 million of major mining equipment will be leased rather than purchased outright.
The construction schedule has been extended compared with the April 2025 feasibility study. Osisko now anticipates approximately 30 months from August 1, 2026 to first gold, compared with 24 months previously, and 36 months to commercial production, compared with 34 months in the earlier study.
For investors, the longer timeline deserves attention, particularly in a mining environment where labour, equipment and construction costs remain important variables. At the same time, Cariboo has moved substantially beyond the conceptual stage. Capital has already been deployed, underground development is advancing and major elements of procurement and engineering are underway.
Building an Underground Gold Mine
Approximately three kilometres of underground development have now been completed, with work continuing from the Cow Portal into the Lowhee and Cow zones.
Earthworks have also commenced at the Valley Portal, which will establish a second underground development front and provide critical access toward the Valley and Shaft zones, where much of Cariboo’s mineral reserve and resource base is located.
The project is designed as a conventional decline-access underground mine using mechanized long-hole stoping with paste backfill.
The mine plan calls for throughput of approximately 4,900 tonnes per day, average life-of-mine production of approximately 190,000 ounces of gold annually, and average production of approximately 202,000 ounces annually during the first five years.
Proven and probable mineral reserves total approximately 17.8 million tonnes grading 3.62 grams per tonne gold, containing approximately 2.07 million ounces of gold.
The fundamental mine plan itself has not materially changed from the April 2025 feasibility study. What has changed significantly is the economic backdrop surrounding that mine plan — most notably the gold price.
Table 4: Cariboo Gold Project – Summary of Project Metrics¹
| Metric | Units | Feasibility Study (April 2025) | Go-Forward Update (August 2026) – LT Consensus | Go-Forward Update – Spot |
|---|---|---|---|---|
| Mine life | years | 10 | 10 | 10 |
| Annual throughput | tpd | 4,900 | 4,900 | 4,900 |
| Average gold head grade | g/t Au | 3.62 | 3.62 | 3.62 |
| Total payable gold, LOM | koz Au | 1,894 | 1,894 | 1,894 |
| Avg. gold production, LOM / First 5 years | koz/yr | 190 / 202 | 190 / 202 | 190 / 202 |
| Gold price | US$/oz | $2,400 | $3,570 | $4,350 |
| Exchange rate | USDCAD | 1.35 | 1.38 | 1.38 |
| Total cash costs² | US$/oz | $947 | $957 | $996 |
| All-in sustaining costs² | US$/oz | $1,157 | $1,163 | $1,202 |
| Project Go-Forward Capital Obligation³ | ||||
| Initial capital | C$ mm | $881 | $990 | $939⁴ |
| Sustaining capital | C$ mm | $426 | $426 | $426 |
| Economic Results – After Tax | ||||
| Total free cash flow, LOM | C$ mm | $1,577 | $3,610 | $4,828 |
| Net present value (NPV₅%) | C$ mm | $943 | $2,323 | $3,181 |
| Internal rate of return (IRR) | % | 22.1% | 34.7% | 42.7% |
| Payback from commercial production | years | 2.8 | 2.2 | 1.8 |
| Average free cash flow², LOM / first 5 years | C$ mm | $158 / $296 | $362 / $521⁵ | $485 / $642⁵ |
¹ Totals may not add up due to rounding. The spot pricing scenario is based on the LBMA gold price as of the close of business on September 11, 2026, rounded to the nearest US$50 per ounce.
² Non-IFRS Financial Measure. See Osisko Gold’s cautionary statements regarding Non-IFRS Financial Measures.
³ The go-forward capital obligation associated with the August 2026 update assumes remaining capital costs from August 1, 2026 through commercial production.
⁴ Under the spot gold-price scenario, higher pre-production revenues provide a greater offset to the go-forward capital obligation than under the long-term consensus pricing scenario.
⁵ Average free cash flow for the first five years is calculated for the periods between 2029 and 2034, inclusive of the pre-production period.
Gold Price Transforms the Economics
The table illustrates why the current gold-price environment is so important to the Cariboo investment case.
The April 2025 feasibility study was based on a gold price of US$2,400 per ounce and generated an after-tax NPV at a 5% discount rate of C$943 million, an IRR of 22.1% and estimated life-of-mine free cash flow of C$1.577 billion.
Under Osisko’s updated long-term consensus assumption of US$3,570 per ounce, after-tax NPV rises to approximately C$2.323 billion, the IRR increases to 34.7%, and projected life-of-mine free cash flow more than doubles to approximately C$3.61 billion.
At the US$4,350-per-ounce spot gold scenario, the numbers become more substantial again.
After-tax NPV increases to approximately C$3.181 billion, IRR reaches 42.7%, estimated life-of-mine free cash flow rises to approximately C$4.828 billion, and payback from commercial production falls to approximately 1.8 years.
Average annual free cash flow during the first five years is estimated at approximately C$642 million under the spot scenario.
These numbers underline the degree of operating leverage that a permitted, high-grade underground development project can have to a rising gold price.
They also help put the C$990 million remaining capital requirement into perspective. Construction cost escalation remains a risk and execution will ultimately determine returns, but stronger gold prices have dramatically increased the financial cushion around the project compared with the economics presented in early 2025.
Implications for Golden Cariboo Resources
Osisko’s construction decision also has implications beyond Osisko itself.
It brings increased investor attention to other companies operating within the Cariboo Gold District, particularly Golden Cariboo Resources Ltd. (CSE: GCC | OTC: GCCFF | FSE: 3TZ | WKN: A402CQ).
Golden Cariboo’s flagship Quesnelle Gold Quartz Mine Property, near Hixon, sits within the same broader central British Columbia gold district. The company describes its property as bordered by the Osisko land position and partly intertwined with Osisko claims at the northern end of the broader Cariboo Gold Project area.
That geographic relationship is increasingly relevant now that Osisko has formally moved from development toward full-scale construction.
There is an important difference between being located in an exploration district and being located in a district where a new mine is actually being built.
Mine construction can attract contractors, geological expertise, skilled labour, infrastructure investment, institutional capital and renewed investor awareness to a region. It can also provide the market with a much clearer valuation framework for nearby exploration and development projects.
Golden Cariboo is approaching its own potentially important catalyst.
The company is awaiting its maiden NI 43-101 Mineral Resource Estimate for the Halo and Main zones, expected this fall. Golden Cariboo reported on September 2 that the drill-hole assay database to be incorporated into the inaugural resource estimate had been completed and that the MRE was being finalized.
That resource estimate could have significant bearing on how investors begin to value the company.
Until an initial mineral resource is established, the market is largely evaluating drill results, geological interpretation, continuity and exploration potential. A maiden resource provides a first independent numerical framework through which investors can begin assessing scale, grade, contained ounces and potential future development scenarios.
Golden Cariboo’s latest drilling has added considerable data to that picture.
Hole QGQ26-30 returned 268.24 metres grading 0.58 g/t gold, including 57.36 metres grading 1.08 g/t gold and 30.62 metres grading 1.16 g/t gold at the Halo zone.
For a junior explorer, combining an inaugural resource estimate with location inside a district where approximately C$1 billion of additional mine-development capital is now expected to be deployed could represent an important re-rating catalyst if the resource demonstrates meaningful scale.
This does not mean that Osisko’s construction decision automatically translates into value for neighbouring companies. Each project must ultimately stand on its own geology, economics, metallurgy, permitting path and financing requirements.
But location matters in mining.
A developing gold district with major infrastructure, active underground construction and sustained exploration expenditures tends to receive considerably more investor attention than an isolated exploration camp.
For Golden Cariboo, the timing of its maiden resource estimate therefore becomes particularly interesting.
Financing the Build
Financing is another important component of Osisko’s decision to proceed.
The company announced a US$30 million strategic private placement by an affiliate of Trafigura at US$3.14 per share, representing a 10% premium to the prior five-day volume-weighted average price.
Trafigura has also agreed to purchase 100% of Cariboo’s gold concentrate and doré production for the first four years, subject to the applicable offtake agreements.
The parties are additionally negotiating a potential subordinated gold prepayment facility of up to US$120 million.
Osisko estimates total available and proposed sources of capital at up to approximately C$1.637 billion, including approximately C$837 million in cash and equivalents.
Against estimated uses of approximately C$1.435 billion through commercial production, the company projects approximately C$201 million of surplus liquidity, although several components remain subject to closing, definitive agreements and other financing assumptions.
Maintaining that liquidity cushion will be important.
One of the most common risks faced by mine developers is entering construction without sufficient contingency capital and subsequently having to raise equity during a difficult market or after encountering cost overruns. Osisko’s funding structure is therefore nearly as important to watch as physical construction progress.
A Major Investment in British Columbia
Cariboo also represents a significant investment in British Columbia’s mining sector.
Osisko expects construction to support as many as 613 direct jobs at peak activity, followed by approximately 525 permanent jobs during operations.
The project received its principal Mines Act and Environmental Management Act permits in late 2024, removing one of the largest development risks facing major Canadian mine projects and allowing the company to advance into the construction phase.
For communities around Wells and the historic Barkerville mining region, the project represents a return of substantial modern underground mining activity to an area synonymous with British Columbia’s original gold rush.
For investors, that history is interesting — but the more important story is what happens next.
The Cariboo Gold Project is no longer simply an advanced exploration project with a feasibility study and permits. Capital is being deployed, underground development is underway, equipment is being procured and Osisko has now formally committed to construction.
At the same time, companies such as Golden Cariboo Resources continue to define new mineralization elsewhere in the district and are approaching milestones of their own.
That combination — mine construction, resource definition and continued exploration — could bring a renewed level of attention to the Cariboo Gold District.
From Development Story to Mine-Building Story
The next phase for Osisko will be defined by execution.
The company has permits, financing capacity, engineering work, underground development and a strong gold-price environment working in its favour. Against that, management must control costs, maintain the construction schedule, complete procurement, continue underground development and successfully commission the processing operation.
With first gold targeted for Q1 2029, the milestones between now and then will increasingly provide investors with measurable evidence of progress.
For Golden Cariboo, the upcoming maiden Mineral Resource Estimate provides a different but potentially significant milestone. Establishing a first NI 43-101 resource at the Quesnelle Gold Quartz Mine Property would arrive at a time when the broader district is receiving substantially greater attention because of Osisko’s construction decision.
The two companies are at very different stages of development, but their progress speaks to the same broader theme.
The historic Cariboo is becoming an active modern gold district again.
Osisko has now crossed the line from development story to mine-building story. Golden Cariboo is approaching the point where the market may receive its first formal measurement of the scale of its own gold system.
For investors following British Columbia gold, that makes the Cariboo Gold District increasingly difficult to ignore.
Disclosure: Golden Cariboo Resources Ltd. is a featured company on MiningIR and compensates MiningIR for media, marketing and investor-awareness services. Accordingly, MiningIR has a commercial relationship with Golden Cariboo Resources. Readers should consider this relationship when evaluating the information contained in this article. This material is for informational purposes only and does not constitute investment advice or a recommendation to purchase or sell securities.
