Bless: Osisko Gold Confirms High-Grade Proserpine System Near Cariboo

• Osisko Gold Group confirmed a new high-grade gold system at the Proserpine target near its Cariboo project, with drilling supporting potential open-pit mining.
• Initial results from 14 holes defined a mineralized footprint of 1 km by 0.5 km, with gold found from near surface to depths beyond 400 metres.
• The company's stock jumped 12.2% to $3.83, though analysts highlight persistent financial losses and heavy cash burn as ongoing risks.
• Osisko plans to drill an additional 26,500 metres to increase density and test Proserpine Northwest, aiming to extend mine life.

Osisko Gold Group Inc. has released initial diamond drilling results from its Proserpine regional greenfield target, located approximately seven kilometres southeast of the Cariboo Gold deposit in central British Columbia. Proserpine regional greenfield target The exploration program, which completed 6,463 metres across 14 holes between February and May 2026, has successfully confirmed high-grade gold structures and broader lower-grade zones. These findings indicate that the Proserpine target could support open-pit bulk mining methods in addition to the planned underground operation at the adjacent Cariboo project.

Drilling efforts have significantly expanded the known mineralized footprint at Proserpine to roughly one kilometre along strike by half a kilometre in width. Gold mineralization was encountered from near surface to depths beyond 400 metres, with the system remaining open in all directions. All 14 holes that reached their intended target depths intersected mineralization, prompting the company to resume drilling with three rigs.

Notable intercepts include hole PSP-26-004, which cut 4.6 metres grading 95.93 grams per tonne gold, including a high-grade interval of 0.5 metres grading 873 grams gold. Another significant hole, PSP-26-001, returned 8.6 metres grading 5.46 grams gold from 97 metres depth, as well as 14.5 metres of 2.17 grams gold from 572 metres. These results demonstrate geological similarities to the Cariboo deposit, reinforcing the potential for a significant new gold system of scale.

National Bank Financial mining analyst Don DeMarco noted that while the exceptional grades are noteworthy, the scale of the discovery is the more critical factor. Drilling has defined mineralization over only a small portion of a much larger target, which covers an area of 6.0 km by 1.0 km. Osisko has resumed drilling with three rigs and plans an additional 26,500 metres to increase drill density at Proserpine Southeast and begin first-pass drilling at Proserpine Northwest.

Cariboo is Osisko’s main development project, located in the historic Wells-Barkerville mining camp. It includes a permitted underground mine and processing complex, with construction work advancing to refine the mine plan. A 2025 feasibility study envisions a scalable underground operation expected to produce about 1.89 million oz. gold over a 10-year life. Based on a 5% discount rate and a US$2,400 per oz. gold price, the project has an after-tax net present value of $943 million.

The Toronto-based company, which recently changed its name from Osisko Development, views Proserpine as a proof-of-concept for meaningful contributor to future resource growth at Cariboo. The stock jumped 12.2% to $3.83 following the announcement, valuing the company at about $1.2 billion. However, AI analyst Spark rates the stock as Neutral, citing persistent losses, heavy cash burn, and a clear technical downtrend.

What Drilling Results Reveal About Proserpine Scale?

The initial drilling results at Proserpine highlight a robust exploration anomaly that extends beyond the known Cariboo deposit. The current defined Cariboo Gold deposit extends approximately 4.0 km along strike by 0.5 km in width, underscoring the exploration potential remaining at Proserpine. President Chris Lodder highlighted the potential for a significant new gold mineralized system of scale located close to the Cariboo deposit.

The drill assay highlights include 95.93 g/t Au over 4.60 m at 71 m vertical depth, 5.46 g/t Au over 8.60 m at 77 m vertical depth, and 2.17 g/t Au over 14.45 m at 431 m vertical depth. Drilling of an additional 26,500 metres, initially with three rigs, is resuming following a seasonal hiatus to further test this emerging system.

Recent deep drilling at Cariboo has extended gold mineralization below 700 metres vertical depth, further refining the mine plan. This expansion aims to identify additional deposits to extend the mine life of the Cariboo project, which currently hosts a permitted underground mine and processing complex.

How Does This Discovery Impact Cariboo Project Economics?

The discovery at Proserpine supports the potential for open-pit mining to complement the planned underground operation at Cariboo. This dual approach could enhance the economic viability of the project by allowing for bulk mining methods alongside the scalable underground operation. The 2025 feasibility study for Cariboo envisions a production profile that could be bolstered by additional resources from Proserpine.

Osisko Gold Group announced that early drilling at its Proserpine target has outlined a new mineralized system capable of supporting future open-pit mining. The stock soared 12.2% to $3.83, reflecting investor optimism about the long-term growth potential of the Cariboo project. However, the company faces persistent losses and heavy cash burn, which imply ongoing funding needs.

Despite the positive drilling results, the company's financial health remains a concern for investors. The technical downtrend and neutral rating from analysts suggest that the market is cautious about the company's ability to fund the extensive drilling program. Osisko's plan to drill an additional 26,500 metres requires significant capital, which may need to be raised through equity or debt financing.

The exploration campaign at Proserpine aims to further define the size of this new gold system close to its permitted Cariboo project. This effort is critical for validating the open-pit potential and ensuring the long-term sustainability of the Cariboo operation. The results to date have expanded the footprint of known mineralization, but much of the target remains undrilled.

Osisko Gold's announcement marks a significant step in the development of the Cariboo project, with Proserpine offering a promising avenue for resource growth. The combination of high-grade intercepts and broad lower-grade zones suggests a robust geological system that could support multiple mining methods. However, the company must navigate financial challenges to realize the full potential of this discovery.

The resumption of drilling with three rigs indicates Osisko's commitment to expanding the known resources at Proserpine. The planned 26,500 metres of drilling will provide critical data to support resource estimation and mine planning. This exploration is essential for de-risking the project and attracting further investment.

As Osisko continues to test the Proserpine target, the market will be watching closely for updates on drill results and financial developments. The potential for open-pit mining at Proserpine could significantly alter the project's economics and extend its mine life. However, the company's persistent losses and cash burn remain key risks to monitor.

The Cariboo project remains a central focus for Osisko Gold, with Proserpine offering a complementary resource base. The successful integration of open-pit and underground mining methods could enhance the project's overall value. Investors will be looking for evidence that Osisko can execute its exploration and development plans effectively.

In summary, Osisko Gold's drilling at Proserpine has confirmed a new high-grade gold system with significant scale. The results support the potential for open-pit mining and could extend the life of the Cariboo project. However, the company's financial challenges and the need for additional funding remain important considerations for investors.

The exploration program at Proserpine is a critical component of Osisko's strategy to grow its resource base. The upcoming drilling results will be key to validating the open-pit potential and supporting future development decisions. The market's reaction to the announcement highlights the importance of this discovery for the company's long-term prospects.