Osisko Development announced Mineral Resource Update for the Trixie Deposit, Tintic Project. Measured resources of 119,847 tonnes grading 27.36 grams per tonne ("g/t") gold ("Au") and 61.73 g/t silver ("Ag"), for a total of 105,437 ounces ("oz") Au and 237,868 oz Ag. The 2024 Trixie MRE incorporated an additional 1,674 underground chip samples over 1,678 meters ("m") (5,507 feet ("ft")) of underground development, and 7,385 m of drilling (24,229 ft) in 122 holes completed by the Company since the release of the initial Trixie MRE (the "2023 Trixie MRE"), with an effective date of January 10, 2023.

Relative to the 2023 Trixie MRE, contained gold ounces in measured and indicated resources decreased by 29% and inferred resources decreased by 79% primarily due to lower estimated grades that incorporated an updated geologic model interpretation and conversion of inferred resources. Drill results and underground mapping from the 2023 exploration program improved the knowledge of the extent and distribution of mineralization, resulting in modeling improvements to both mineralization and the historical mine shape model. Geologic modelling was completed by Osisko Development modeling geologist Jody Laing, P.Geo, using Leapfrog Geo software.

The 2024 TrixieMRE was completed by Osisko development chief resource geologist, Daniel Downton, P.Geo using Datamine Studio RM 2.0 software. The 2023 drill program also converted ounces from inferred to indicated, and drilling at depth indicated a transition from high-grade gold to anomalous copper, which prompted the testing of the deep porphyry target at Trixie West. As a result, the model now incorporates tight search parameters around these structures, increasing confidence within the zone, while also including the quartz-barite-sulphosalt disseminated stockwork mineralization.

The new drilling, mapping and historical data compilation improved the interpretation and revealed that there is significant potential for parallel high-grade gold fissure zones similar to T2 and adjacent to the existing mine development. Information contained in forward-looking statements is based upon certain material assumptions that were applied in drawing a conclusion or making a forecast or projection, including the utility of modern exploration techniques; the potential for parallel high-gradegold fissure zones; the potential for parallel high -grade gold fissure zones; The potential of Tintic to host a copper-gold porphyry center; the significance of regional exploration potential; the results of the 2024 Trixie MRE; the capital resources available to Osisko Development; the ability of the Company to execute its planned activities; the ability of the Company To obtain future financing and the terms of such financing; management's assumptions of historical trends, current conditions and expected future developments; the Company's ability to prepare and file the Technical Report within 45 days; the utility and significance of historic data, including the significance of the district hosting past producing mines; future mining activities; unique mineralization at Trixie; the potential of high-grade gold mineralization on Trixie; the potential for unknown mineralized structures to extend existing zones of mineralization; category conversion; the timing and status of permitting; the results (if any) of further exploration work to define and expand mineral resources; the ability of exploration work (including drilling and chip sample assays, and face sampling methodologies) to accurately predict mineralization; the ability of management to accurately predict mineralization; The ability of management to generate additional drill targets; the ability of management to understand the geology and potential of the Company's properties; the ability of the company to expand mineral resources beyond current mineral resource estimates; the ability of the Company.