Gold Intercepts From Underground Sampling At Trixie-Tintic Project

MONTREAL - Osisko Development Corp. reported drilling and underground chip sampling results from new development areas as part of its 2023 exploration program at its Trixie test mine, within the wider Tintic Project, located in the historic East Tintic Mining District in central Utah. Assay highlights include underground chip samples from 79 new development faces at Trixie. Of these, 35 faces had samples with greater than 1.0 grams per tonne (g/t) gold (Au) or greater than 50.0 g/t silver (Ag) values. The remaining chip samples returned no significant assays.

Chip samples were collected in new development areas in the face and walls of exploration crosscuts to explore along all domains of the Trixie deposit on the 625 Level, to the north towards the Trixie Fault and to the south towards the Sioux Ajax Fault. The sampling and drilling results provide support that target areas to the north of Trixie and to the south down plunge of the T2 structure are mineralized and warrant further follow-up exploration drilling and sampling.

In 2023, the company completed a total of 6,447 m (21,151 ft) of underground drilling in 73 DD holes at Trixie. To date, assays have been received for 59 DD holes, with assays pending for the remaining holes. One diamond drill rig is currently active underground testing a copper-gold porphyry target, Trixie West, below the Trixie deposit. Approximately 25% of the drilling to date consists of delineation of domains within the area of the current Trixie MRE (as defined herein) and 75% is exploration drilling adjacent to the area of the Trixie MRE, including step outs down dip, down plunge and along strike testing for mineralized structures. The focus of these recent holes was to test for mineralization along one of the priority target areas south on strike from the known T2 domain, towards the Sioux Ajax fault. A new mineral resource estimate (MRE) for the Trixie deposit is expected to be completed once all assay results from the 2023 exploration program have been received and surface and underground mapping data has been integrated.