Osisko Gold Reports High-Grade Drilling at Proserpine Target

• Osisko Gold Group Inc. has announced initial diamond drilling results from its Proserpine regional greenfield target, confirming a new high-grade gold mineralized system.
• The program completed 6,463 meters across 14 drill holes, intersecting structures similar to the nearby Cariboo deposit and broader zones of lower-grade mineralization.
• The results suggest potential for bulk open-pit mining methods in addition to the planned underground operation at the main Cariboo project.
• Analysts and management emphasize that the undefined scale of the target remains open in all directions, representing a significant proof-of-concept for resource growth.

The initial surface exploration program at Proserpine, located approximately 7 kilometers southeast of the permitted Cariboo Gold Project in central British Columbia, has successfully outlined an emerging mineralized system. Drilling has expanded the known mineralized footprint at Proserpine to approximately 1.0 kilometer along strike by 0.5 kilometers in width. This expansion occurs within a larger 6.0-kilometer by 1.0-kilometer anomaly, with mineralization remaining open in all directions from near-surface depths to over 400 meters downhole.

Key intercepts from the campaign include 95.93 grams per tonne gold over 4.60 meters at a vertical depth of 71 meters, which included a high-grade 0.50-meter interval grading 873 grams per tonne gold. Another significant intersection returned 5.46 grams per tonne gold over 8.60 meters at a vertical depth of 77 meters. These high-grade structures, combined with broader low-grade zones, indicate the potential for bulk mining methods such as open-pit operations. The presence of siliceous sandstone, believed to be a favorable host for mineralization, was also noted during the program.

How Does the Proserpine Discovery Impact Cariboo Gold Project Economics?

The confirmation of a mineralized system with open-pit potential at Proserpine fundamentally alters the strategic outlook for the Cariboo Gold Project. While the main Cariboo asset is undergoing construction with a feasibility study envisioning a 10-year, 1.89 million ounce gold production from underground mining, the Proserpine discovery offers a complementary bulk-tonnage opportunity. Osisko Gold President Chris Lodder highlighted that the results highlight a significant new gold mineralized system of scale, distinct from the high-grade underground structures at Cariboo.

National Bank Financial analyst Don DeMarco noted that the results serve as a proof-of-concept for Proserpine's contribution to future resource growth. He emphasized that while the grades are exceptional, the primary investment driver is the undefined scale of the mineralized system. The ability to potentially add an open-pit mine to the project's portfolio significantly expands the long-term resource base and operational flexibility. This dual-method potential supports a more robust economic model for the regional property.

Why Did the Market React Positively to the Drilling Results?

The market reacted swiftly to the announcement, with Osisko Gold's stock surging 12.2% to $3.83, valuing the company at approximately $1.2 billion. Investors responded positively to the proof of concept for resource growth outside the immediate Cariboo deposit. The drilling results demonstrated that the Proserpine prospect, which represents a roughly 4-kilometer long fault-bound strike length, holds substantial exploration upside. The fact that all 14 holes encountered mineralization from near surface to depths exceeding 400 meters underscores the continuity and depth of the system.

Despite the positive market response, analysts caution that the scale of the target is still largely undefined. The mineralization has only been tested over a small portion of the larger anomaly, and the full extent of the open-pit potential remains to be determined. The company plans to resume drilling with three active rigs, aiming to complete an additional 26,500 meters. This upcoming campaign will focus on increasing drill density and testing previously untargeted areas at Proserpine Northwest to further define the resource potential.

The strategic significance of the Proserpine discovery lies in its ability to extend the mine life and production capacity of the Cariboo Gold Project. By confirming the presence of a high-grade system with bulk mining potential, Osisko Gold has validated the geological model for the regional property. The upcoming drilling program will be critical in determining whether Proserpine can transition from a greenfield target to a defined resource component. This development adds a significant layer of growth potential to the company's primary asset base in British Columbia.