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Osisko Development Intersects 164.92 g/t Gold over 10.50 meters at Cariboo Gold Project, Valley Zone

Press Release

MONTREAL, June 1, 2022 – Osisko Development Corp. (“Osisko Development” or the “Company”) (ODV TSX.V & NYSE) is pleased to announce the remaining and final drilling results from the 2021 exploration and category conversion drill campaign at the Valley Zone of its Cariboo Gold Project (“Cariboo”) in central British Columbia.

Summary

  • A total of A total of 49,500 meters were drilled in 114 holes at the Valley Zone in 2021.
  • Results released below are from holes CM-21-094 to CM-21-112 (see Figures 1 and 2 for the drill hole location maps).
  • Highlights include 92 g/t Au over 10.50 m in hole CM-21-097 at a depth of 200 meters from surface with high grade samples of 67.10 g/t Au over 0.50 m, 18.60 g/t Au over 0.60 m, 16.35 g/t Au over 1.00 m, 8.15 g/t Au over 1.00 m, 1,605 g/t Au over 1.00 m (with visible gold observed), 13.25 g/t Au over 1.00 m and 20.30 g/t Au over 1.00 m (see Figure 3 cross section).
  • CM-21-099 intersected a vein corridor that assayed 26 g/t Au over 14.40 m and included high grade samples of 104.5 g/t Au over 1.00 m and 61.10 g/t Au over 1.00 m.
  • The drill results confirmed anomalous gold values within multiple modelled vein corridors as shown in the cross section below. Additional noteworthy highlights are listed below.
  • Detailed drilling results and a drill hole location plan map are presented at the end of this release.

Assay Highlights

  • 26 g/t Au over 6.15 meters in hole CM-21-094 including
  • 20 g/t Au over 0.50 meter
  • 74 g/t Au over 3.00 meters in hole CM-21-094 including
  • 50 g/t Au over 0.75 meter
  • 66 g/t Au over 12.60 meters in hole CM-21-094
  • 82 g/t Au over 7.20 meters in hole CM-21-094
  • 50 g/t Au over 0.50 meter in hole CM-21-095
  • 19 g/t Au over 6.70 meters in hole CM-21-095 including
  • 90 g/t Au over 0.95 meter in hole CM-21-095
  • 00 g/t Au over 0.50 meter in hole CM-21-096
  • 25 g/t Au over 6.35 meters in hole CM-21-097
  • 92 g/t Au over 10.50 meters in hole CM-21-097 including
  • 1,605.00 g/t Au over 1.00 meter
  • 99 g/t Au over 3.85 meters in hole CM-21-097 including
  • 10 g/t Au over 1.20 meters
  • 50 g/t Au over 0.95 meter in hole CM-21-099
  • 26 g/t Au over 14.40 meters in hole CM-21-099 including
  • 50 g/t Au over 1.00 meter in hole CM-21-099 and
  • 10 g/t Au over 1.00 meter in hole CM-21-099
  • 50 g/t Au over 0.80 meter in hole CM-21-099
  • 71 g/t Au over 7.60 meters in hole CM-21-100
  • 18 g/t Au over 11.85 meters in hole CM-21-100
  • 48 g/t Au over 10.50 meters in hole CM-21-104
  • 44 g/t Au over 6.80 meters in hole CM-21-106
  • 55 g/t Au over 7.85 meters in hole CM-21-106 including
  • 00 g/t Au over 0.50 meter in hole CM-21-106
  • 93 g/t Au over 12.40 meters in hole CM-21-106 including
  • 40 g/t Au over 0.70 meter in hole CM-21-106
  • 14 g/t Au over 4.10 meters in hole CM-21-107
  • 68 g/t Au over 4.20 meters in hole CM-21-107
  • 59 g/t Au over 8.20 meters in hole CM-21-107
  • 15 g/t Au over 10.85 meters in hole CM-21-109

Sean Roosen, CEO of Osisko Development commented,

“We are excited and encouraged by the final results received at the Valley Zone of the Cariboo Gold Project. The Valley Zone is one of seven important mineralized zones within the broader Cariboo Gold Project, and the Valley Zone contains 536,000 ounces of gold (4.4 million tonnes grading 3.8 g/t Au) in the indicated category and 235,000 ounces of gold (2.1 million tonnes grading 3.4 g/t Au) in the inferred category. The updated Mineral Resource Estimate has an effective date of May 17, 2022 and published in the recent Preliminary Economic Assessment filed on SEDAR on May 24th, 2022. The purpose of this drilling was to expand known vein corridors and increase confidence to support further technical work, and the goal was successfully achieved.”

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 approximately 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 and drill hole locations are listed in Table 2.

Figure 1: Cariboo Gold Project areas overview map (mineralized zones are shown in red)

Figure 2: Valley Zone select drilling highlights

Figure 3: Cross Section of CM-21-097

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”).

About Osisko Development Corp.

Osisko Development Corp. is uniquely positioned as a premier gold development company in North America to advance the Cariboo Gold Project and other Canadian and Mexican properties, with the objective of becoming the next mid-tier gold producer. The Cariboo Gold Project, located in central British Columbia, Canada, is Osisko Development’s flagship asset. The considerable exploration potential at depth and along strike distinguishes the Cariboo Gold Project relative to other development assets. Osisko Development’s project pipeline is complemented by its interest in the San Antonio gold project, located in Sonora, Mexico and the Trixie gold test mine, located in Utah, USA..

For further information, please contact Osisko Development Corp.:

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

Read More: https://osiskodev.com/wp-content/uploads/2022/06/Valley_DrillResults_June1_final.pdf

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