Osisko Development Provides Infill Drilling Update on Its 13,000-Meter Lowhee Program at Cariboo Gold Project; Intercepts Include 596.40 g/t Gold Over 2.0 Meters from 6.1 Meters Downhole, Including 2,293.56 g/t Gold Over 0.5 Meters from 6.6 Meters Downhole

Core Insights - Osisko Development Corp. has announced new infill drilling results from its ongoing 13,000-meter program at the Cariboo Gold Project, with a total of approximately 11,025 meters completed, representing about 80% of the planned drilling [2][4]. Drilling Program Details - The infill drilling program commenced in August 2025 and involves 10-meter drill spacing in the Lowhee Zone of the Cariboo Gold Project [2][3]. - A total of approximately 12.1 kilometers (km), or about 88% of the planned drill meters, has been completed to date, with full assay results pending for the remaining holes [3][4]. Assay Highlights - The latest results include significant gold intercepts such as: - 596.40 grams per tonne (g/t) Au over 2.0 meters from 6.1 meters downhole, including 2,293.56 g/t Au over 0.5 meters [4][5]. - 21.67 g/t Au over 3.5 meters from 96.5 meters downhole, including 135.44 g/t Au over 0.5 meters [5][6]. - 21.97 g/t Au over 2.5 meters from 48.7 meters downhole, including 88.08 g/t Au over 0.5 meters [5][6]. Implications of Results - The results are expected to enhance the understanding of spatial controls and local variability within the Lowhee Zone, which may lead to refinements in the infill drill requirements and production designs [3][9]. - Observations of above cut-off assays in previously unmodeled areas suggest potential for additional mineralization, which will be incorporated into the updated local block model [9][10]. Future Outlook - Infill drilling activities are anticipated to conclude in early Q2 2026, following a temporary suspension due to an incident reported on January 23, 2026 [3][4].