Osisko Development Corp. announced drilling results from the 2021 exploration and category conversion drill campaign at its Cariboo Gold Project in central British Columbia. A total of 28,000 meters were drilled in 92 holes at Lowhee Zone on Barkerville Mountain in 2021.

Recent assay results include holes BM-21-052 to BM-21-080. BM-21-072 intersected a mineralized vein corridor with visible gold and cosalite that assayed 50.11 g/t Au over 7.50 meters including high grade samples of 630.00 g/t Au over 0.55 meter and 48.80 g/t Au over 0.55 meter. BM-21-062 assayed 227.00 g/t Au over 0.50 meter, located in the southeastern portion of the Lowhee Zone, further indicating exploration potential outside of the known veins.

BM-21-071 intersected mineralized vein corridors of 21.35 g/t Au over 6.75 meters including a sample of 61.40 g/t Au over 0.85 meter within a modelled vein corridor. Additional high grade samples include 89.90 g/t Au over 0.60 meter in hole BM-21-056, 95.10 g/t Au over 0.70 meter in hole BM-21-058 and 94.00 g/t Au over 0.50 meter in hole BM-21-069. Detailed drilling results and a drill hole location plan map are presented at the end of this release.

57.10 g/t Au over 0.50 meter in hole BM-21-052 including 46.60 g/t Au over 0.50 meter 10.51 g/t Au over 5.65 meters in hole BM-21-053 10.18 g/t Au over 4.65 meters in hole BM-21-053 including 45.50 g/t Au over 0.70 meter 23.90 g/t Au over 1.45 meters in hole BM-21-053 51.10 g/t Au over 0.50 meter in hole BM-21-054 13.62 g/t Au over 3.00 meters in hole BM-21-056 including 55.10 g/t Au over 0.50 meter 7.42 g/t Au over 4.30 meters in hole BM-21-056 89.90 g/t Au over 0.60 meter in hole BM-21-056 17.51 g/t Au over 4.20 meters in hole BM-21-058 including 95.10 g/t Au over 0.70 meter 7.66 g/t Au over 8.20 meters in hole BM-21-060 8.38 g/t Au over 8.00 meters in hole M-21-061 including 72.60 g/t Au over 0.50 meter 11.65 g/t Au over 2.90 meters in hole BM-21-061 227.00 g/t Au over 0.50 meter in hole BM-21-062 8.24 g/t Au over 4.85 meters in hole BM-21-062 including 57.70 g/t Au over 0.50 meter 10.97 g/t Au over 4.25 meters in hole BM-21-063 16.09 g/t Au over 5.95 meters in hole BM-21-064 including 65.00 g/t Au over 0.65 meter 62.80 g/t Au over 0.55 meter 28.10 g/t Au over 1.55 meters in hole BM-21-065 including 80.70 g/t Au over 0.50 meter 75.50 g/t Au over 0.60 meter in hole BM-21-068 94.00 g/t Au over 0.50 meter in hole BM-21-069 21.35 g/t Au over 6.75 meters in hole BM-21-071 including 61.40 g/t Au over 0.85 meter 60.50 g/t Au over 0.50 meter in hole BM-21-071 50.11 g/t Au over 7.50 meters in hole BM-21-072 including 630.00 g/t Au over 0.55 meter and 48.80 g/t Au over 0.55 meter 7.45 g/t Au over 5.30 meters in hole BM-21-077 Per National Instrument 43-101 Standards of Disclosure for Mineral Projects, Maggie Layman, P.Geo. Vice President Exploration of Osisko Development Corp., is a Qualified Person and has prepared, validated, and approved the technical and scientific content of this news release. Once received from the drill and processed, all drill core samples are sawn in half, labelled and bagged.

The remaining drill core is subsequently stored on site at a secured facility in Wells, BC. Numbered security tags are applied to lab shipments for chain of custody requirements. Quality control (QC) samples are inserted at regular intervals in the sample stream, including blanks and reference materials with all sample shipments to monitor laboratory performance.

The QAQC program was designed and approved by Lynda Bloom, P.Geo. of Analytical Solutions Ltd. Drill core samples are submitted to ALS Geochemistry's analytical facility in North Vancouver, British Columbia for preparation and analysis. The ALS facility is accredited to the ISO/IEC 17025 standard for gold assays and all analytical methods include quality control materials at set frequencies with established data acceptance criteria.

The entire sample is crushed, and 250 grams is pulverized. Analysis for gold is by 50g fire assay fusion with atomic absorption (AAS) finish with a lower limit of 0.01 ppm and upper limit of 100 ppm. Samples with gold assays greater than 100 ppm are re-analyzed using a 1,000g screen metallic fire assay.

A selected number of samples are also analyzed using a 48 multi-elemental geochemical package by a 4-acid digestion, followed by Inductively Coupled Plasma Atomic Emission Spectroscopy (ICP-AES) and Inductively Coupled Plasma Mass Spectroscopy (ICP-MS).