Osisko Gold Stock Surges on Proserpine Discovery Near Cariboo Project

• Osisko Gold Group confirmed new high-grade gold mineralized system at the Proserpine target, located 7 km from its permitted Cariboo project in British Columbia.
• Initial drilling results revealed high-grade structures alongside broader low-grade zones that suggest potential for open-pit mining methods.
• The stock surged 12.2% to $3.83 in Toronto trading following the announcement of the significant exploration success.
• The company has resumed drilling with three rigs to further test the large regional anomaly and expand its resource base ().

Osisko Gold Group Inc. has reported initial diamond drilling results from its Proserpine regional greenfield target, confirming a new gold mineralized system . The program completed 6,463 metres in 14 holes between February and May 2026, validating the presence of high-grade structures similar to those at the nearby Cariboo deposit . These findings indicate potential for open pit mining and significant exploration upside within a largely untested 6.0 km x 1.0 km anomaly .

Key intercepts included 95.93 g/t Au over 4.60 m and 5.46 g/t Au over 8.60 m, highlighting the quality of the mineralization . Drilling expanded the known mineralized footprint to roughly one kilometre along strike by half a kilometre in width . Mineralization was encountered from near surface to depths beyond 400 metres and remains open in all directions .

Why Is Osisko Resuming Drilling at Proserpine?

President Chris Lodder noted that the results encourage further exploration of this significant new system . With all holes reaching target depth intersecting mineralization, Osisko has resumed drilling with three rigs . The company plans an additional 26,500 metres to increase drill density at Proserpine Southeast and initiate first-pass drilling at Proserpine Northwest .

This exploration aims to expand the resource base near its shovel-ready Cariboo project . The broader zones of lower-grade mineralization identified suggest potential for bulk mining or open-pit methods . This discovery provides add open-pit production capacity alongside the planned underground operation at Cariboo.

How Does the Proserpine Discovery Impact the Cariboo Project?

The Proserpine discovery adds a potential open-pit component to the district, enhancing the long-term value proposition of the asset base . The Cariboo Gold Project is a permitted underground operation with a feasibility study outlining a 10-year life and significant resource bases . The Proserpine discovery provides a pathway to extend the mine life of the nearby Cariboo asset .

National Bank Financial analyst Don DeMarco noted that while the exceptional grades are noteworthy, the scale is the more significant factor . Only a small portion of the larger target area has been tested, indicating substantial exploration upside . The discovery reinforces the district-scale potential of the historic Wells-Barkerville mining camp .

What Is the Strategic Context for Osisko Gold Group?

Osisko Gold Group Inc. recently completed its corporate rebranding from Osisko Development Corp. to reflect a strategic shift in focus toward its gold assets . The company is now trading under the ticker symbols OGG on the NYSE and TSXV . This rebranding aligns with the company's emphasis on its primary asset, the Cariboo Gold Project .

The company also reported the completion of its Lowhee Zone infill drilling program at the Cariboo Gold Project (). The results validate existing geological models and mine-planning parameters, supporting the technical basis for continued development . This validation is critical for advancing the project toward production by confirming the continuity and grade of the mineralization .

Osisko maintains a disciplined approach to capital allocation, development risk, and mineral inventory growth. The company focuses on developing long-life mining assets located in mining-friendly jurisdictions . The confirmation of open-pit potential at Proserpine aligns with the strategy of expanding its mineral inventory through targeted exploration .

The market reaction to the Proserpine drilling highlights was overwhelmingly positive, driven by the confirmation of a new mineralized system . Investors view the company favorably due to its valuation and growth potential. The discovery supports the company's strategy to expand resource inventory beyond its permitted Cariboo underground project .

Osisko's approach to mineral exploration demonstrates a commitment to identifying scalable resource development opportunities . By identifying high-grade, near-surface deposits, the company aims to enhance the economic viability of its regional properties . This strategy supports long-term value creation by reducing upfront capital requirements and accelerating potential production timelines .

The successful completion of the Lowhee Zone infill program further underscores the company's operational progress . The findings support the continued use of existing geological and mine-planning assumptions and parameters . This technical validation allows for more accurate reserve definitions and economic modeling .

Osisko Gold Group is positioning itself as a pure-play gold development entity with a strong focus on the Cariboo district . The combination of high-grade underground potential at Cariboo and open-pit potential at Proserpine offers a diversified development pathway . The company's strategic focus on North American jurisdictions ensures exposure to stable regulatory environments .

The resumption of drilling with three rigs indicates management's confidence in the Proserpine target's potential . The planned 26,500 metres of drilling will be critical in defining the full extent of the mineralized system . This exploration campaign represents a significant step in the company's resource growth strategy .