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Osisko Development Intersects 10.85 g/t Au over 14.25 meters and other HighGrade Samples of 91.6 g/t Au, 90.7 g/t Au, 126.5 g/t Au, 120.0 g/t Au, 94.1 g/t Au, 201.0 g/t Au, 278.0 g/t Au and 113.0 g/t Au at Valley

Press Release

MONTREAL, April 13, 2022 – Osisko Development Corp. (“Osisko Development ” or the “Company”) (TSX.V-ODV) is pleased to announce drilling results from the 2021 exploration and category conversion drill campaign at its Cariboo Gold Project (“Cariboo”) in central British Columbia.

Summary

  • A total of 47,500 meters were drilled in 109 holes in the Valley Deposit in 2021.
  • This news release includes assay results from holes CM-21-061-1 to CM-21-093 (Figures 1 and 2).
  • Visible gold was observed in many holes including assays of60 g/t Au over 0.60 meter in hole CM-21-063, 126.50 g/t Au over 0.50 meter in CM-21-068, 120.00 g/t Au over 0.50 meter and 94.10 g/t Au over 0.65 meter in CM-21-084, 201.00 g/t Au over 0.50 meter CM-21-086 and 278.00 g/t Au over 0.50 meter in CM-21-088 (Figure 3).
  • CM-21-078 intersected a vein corridor that assayed 85 g/t Au over 14.25 meters and included higher grade samples of 23.20 g/t Au over 0.70 meter, 32.10 g/t Au over 0.80 meter, 23.90 g/t Au over 0.50 meter, 25.70 g/t Au over 0.50 meter, 23.40 g/t Au over 0.50 meter and 22.90 g/t Au over 0.50 meter.
  • Detailed drilling results and a drill hole location plan map are presented at the end of this release.

Assay Highlights

  • 51 g/t Au over 11.65 meters in hole CM-21-061-1
  • 08 g/t Au over 0.60 meter in hole CM-21-061-1
  • 60 g/t Au over 0.60 meter in hole CM-21-063
  • 62 g/t Au over 1.60 meters in hole CM-21-064
  • 44 g/t Au over 5.20 meters in hole CM-21-064
  • 70 g/t Au over 0.50 meter in hole CM-21-066
  • 03 g/t Au over 8.20 meters in hole CM-21-067
  • 50 g/t Au over 0.50 meter in hole CM-21-068
  • 57 g/t Au over 13.55 meters in hole CM-21-069 including
  • 20 g/t Au over 0.75 meter
  • 11 g/t Au over 6.25 meters in hole CM-21-070
  • 89 g/t Au over 16.90 meters in hole CM-21-071
  • 85 g/t Au over 7.55 meters in hole CM-21-076
  • 85 g/t Au over 14.25 meters in hole CM-21-078
  • 80 g/t Au over 1.15 meters in hole CM-21-084 including
  • 00 g/t Au over 0.50 meter
  • 01 g/t Au over 4.80 meters in hole CM-21-084 including
  • 10 g/t Au over 0.65 meter
  • 74 g/t Au over 3.80 meters in hole CM-21-085
  • 73 g/t Au over 2.50 meters in hole CM-21-086
  • 00 g/t Au over 0.50 meter in hole CM-21-086
  • 98 g/t Au over 8.10 meters in hole CM-21-087
  • 40 g/t Au over 4.15 meters in hole CM-21-087 including
  • 00 g/t Au over 0.50 meter
  • 87 g/t Au over 1.50 meters in hole CM-21-088 including
  • 00 g/t Au over 0.50 meter
  • 00 g/t Au over 0.50 meter in hole CM-21-089
  • 78 g/t Au over 8.00 meters in hole CM-21-089
  • 44 g/t Au over 4.90 meters in hole CM-21-091
  • 89 g/t Au over 8.70 meters in hole CM-21-092
  • 47 g/t Au over 1.90 meters in hole CM-21-093 including
  • 30 g/t Au over 0.90 meter
  • 57 g/t Au over 5.35 meters in hole CM-21-093
  • 72 g/t Au over 2.60 meters in hole CM-21-093
  • 80 g/t Au over 0.60 meter in hole CM-21-093
  • 89 g/t Au over 8.60 meters in hole CM-21-093

Maggie Layman, Vice President of Exploration for Osisko Development commented, “The 2021 category conversion and exploration program at the Valley Deposit was successful in delineating and expanding known vein corridors with high grade gold samples to support our feasibility study and ongoing mine planning, increasing confidence in the project and generating further interest for exploration within the main area and beyond.”

Vein corridors are defined as high-density networks of mineralized quartz veins within the axis of the deposit’s last folding event. These mineralized structures are predominantly hosted within a brittle meta-sandstone or calcareous meta- sandstone. Vein corridors are modelled at a minimum thickness of 2.00 meters and average about 4.50 meters true width. Individual mineralized veins within these corridors have widths varying from centimeters to several meters and strike lengths from a few meters to over 50 meters. These corridors have been defined from surface to a vertical depth averaging 300 meters and remain open for expansion at depth and along strike. Gold grades are intimately associated with quartz vein-hosted pyrite as well as pyritic, intensely silicified wall rock vein selvages.

True widths are estimated to be 60% to 75% of reported core length intervals. Intervals not recovered by drilling were assigned zero grade. Top cuts have not been applied to high grade assays. Complete assay highlights are presented in Table 1, drill hole locations are listed in Table 2.

Figure 1: Cariboo deposit areas overview map

Figure 2: Valley Zone select drilling highlights

Figure 3: Cross Section of CM-21-088

Qualified Persons

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.

Quality Assurance – Quality Control

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”).

For further information, please contact Osisko Development Corp.:

Jean Francois Lemonde
VP Investor Relations
[email protected]
Tel: 514-299-4926

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