Osisko Gold Confirms High-Grade Mineralized System at Proserpine Target

• Osisko Gold Group announced initial drilling results from the Proserpine target, confirming new high-grade gold mineralized system.
• The discovery includes exceptional intercepts such as 95.93 grams per tonne gold over 4.60 meters, expanding the known footprint and signaling significant resource growth potential for the Cariboo project.
• Market participants responded positively to the announcement, with the company's stock rising 9% to 12.2% following the release of the high-grade results.
• Analysts highlight that the scale of the mineralization, rather than just the grades, provides a proof-of-concept for bulk mining methods alongside the existing underground operations.

Osisko Gold Group Inc. has confirmed the presence of a significant new gold mineralized system at its Proserpine regional target, located approximately 7 kilometers from its 100%-owned Cariboo Gold Project in British Columbia . The initial phase of a surface exploration diamond drilling program tested 14 holes totaling 6,463 meters at the greenfield site . These results revealed an emerging system comprising high-grade structures similar to those at the Cariboo deposit, alongside broader zones of lower-grade mineralization .

The geological configuration identified suggests the potential for open-pit mining methods, which could complement the planned underground operations at the main Cariboo deposit . This dual-mining approach is critical for the project's long-term scalability, as the Cariboo project is permitted as an underground mine with a processing complex. The discovery at Proserpine represents a strategic expansion of the resource base within the same district, offering significant exploration upside .

What Are the Key Drill Results at Proserpine?

The initial drilling campaign delivered standout intercepts that underscore the high-grade nature of the Proserpine target. Hole PSP-26-004 intersected 4.60 meters grading 95.93 grams per tonne gold at a vertical depth of 71 meters . This interval included a high-grade core of 873.00 grams per tonne gold over 0.50 meters . Another significant hole, PSP-26-001, cut 8.60 meters grading 5.46 grams per tonne gold at 77 meters vertical depth .

Deeper intervals also yielded substantial results, with hole PSP-26-001 intersecting 14.45 meters grading 2.17 grams per tonne gold at a vertical depth of 431 meters . Mineralization has been defined over a footprint of approximately 1.0 kilometer by 500 meters, with the system remaining open in all directions . This open-ended nature suggests that the current footprint is only a small portion of a much larger 6.0 km by 1.0 km anomaly .

Geological analysis indicates that siliceous sandstone units intersected during drilling are likely more favorable hosts for mineralization than calcareous sandstone . Drilling encountered mineralization from near surface to depths exceeding 400 meters, reinforcing the vertical extent of the system . These results provide a strong foundation for the company's exploration strategy and potential resource expansion .

How Does Proserpine Impact the Cariboo Project Outlook?

The Proserpine discovery is viewed as a significant exploration upside asset for Osisko Gold's main development asset, the Cariboo Gold Project . The Cariboo project holds probable reserves of 2.071 million ounces of gold and is fully permitted for underground development . A 2025 feasibility study projects a 10-year life producing 1.89 million ounces of gold, with an after-tax net present value of $943 million .

Recent deep drilling at Cariboo has extended mineralization below 700 meters vertical depth, reinforcing long-term growth potential . The addition of a potential open-pit operation at Proserpine could further enhance the project's scalability and production profile . National Bank Financial analyst Don DeMarco noted that the results provide an encouraging proof-of-concept for resource growth .

He emphasized that while the grades are exceptional, the more important takeaway is the scale of the mineralized system . The ability to support bulk mining methods alongside underground operations diversifies the mining strategy and mitigates operational risks . This dual approach positions Osisko Gold to capitalize on both high-grade and lower-grade bulk tonnage opportunities .

What Is the Next Phase of Exploration at Proserpine?

Following these initial results, Osisko Gold plans to resume drilling with an additional 26,500 meters, initially utilizing three rigs . The company had paused drilling for a seasonal hiatus but is now accelerating its exploration efforts at the Proserpine target . The expanded campaign aims to test the Proserpine Southeast and Proserpine Northwest areas to further define the mineralized footprint .

Management noted that drilling has only tested a small portion of the larger anomaly, indicating substantial exploration potential . The goal is to expand the resource base and potentially convert inferred resources to measured and indicated categories . This systematic approach allows the company to evaluate the viability of open-pit mining methods in detail .

Osisko Gold, which recently changed its name from Osisko Development, remains focused on advancing its regional targets . The Proserpine target is one of several being tested to support the long-term development of the Cariboo project . The company's strategic focus on high-grade discoveries in British Columbia continues to attract investor interest .