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Osisko Development Intersects 9.05 g/t Au Over 11.65 Meters Including 73.0 g/t Au Over 0.75 Meter at Lowhee

Press Release

MONTREAL, March 30, 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.


  • A total of 29,450 meters were drilled in 94 holes at Lowhee Zone on Barkerville Mountain in 2021.
  • Final assay results have now been received and this release include holes BM-21-081 to BM-21-094 (Figures 1 and 2).
  • Drillhole BM-21-082 intersected multiple high-grade samples including 10 g/t Au over 0.50 meter, 70.00 g/t Au over 0.50 meter (visible gold noted here) and 72.70 g/t Au over 0.50 meter.
  • Drillhole BM-21-086 intersected multiple mineralized vein corridors with intervals that assayed 00 g/t Au over 5.30 meters including a high-grade sample of 49.00 g/t Au. An interval further down hole assayed 9.05 g/t Au over 11.65 meters including higher grade samples of 73.00 g/t Au and 39.70 g/t Au.
  • One drill is currently conducting infill and exploration on the Lowhee Deposit.
  • Detailed drilling results and a drill hole location plan map are presented at the end of this release.

Assay Highlights

  • 10 g/t Au over 0.50 meter in hole BM-21-082
  • 00 g/t Au over 0.50 meter in hole BM-21-082
  • 70 g/t Au over 0.50 meter in hole BM-21-082
  • 00 g/t Au over 0.50 meter in hole BM-21-083
  • 00 g/t Au over 5.30 meters in hole BM-21-086 including
  • 00 g/t Au over 0.65 meter
  • 05 g/t Au over 11.65 meters in hole BM-21-086 including
  • 00 g/t Au over 0.75 meter and
  • 70 g/t Au over 1.20 meters
  • 61 g/t Au over 4.50 meters in hole BM-21-093
  • 95 g/t Au over 7.65 meters in hole BM-21-093 including
  • 40 g/t Au over 1.15 meters

Chris Lodder, President of Osisko Development commented, “As the Lowhee deposit is located immediately to the Southeast of the Cow Mountain deposit within the Cariboo Gold Project, these new results continue to highlight the extensive on strike and at depth mineralization potential yet to be defined along the Cariboo trend. Infill drilling is presently taking pace at Lowhee to better define an area for the fully permitted, 10,000 tonne bulk underground sample, of Cariboo style mineralization. This bulk sample will be accessed from the newly established Cow Mountain Portal located at Lowhee.”

Vein corridors are defined as a high-density network of mineralized quartz veins within the axis of the last folding event and 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 haloes in close proximity to the veins.

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: Lowhee Zone select drilling highlights

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, is Osisko Development’s flagship asset with measured and indicated resources of 21.44 Mt at 4.6 Au g/t for a total of 3.2 million ounces of gold and inferred resource of 21.69 Mt at 3.9 Au g/t for a total of 2.7 million ounces of gold (see NI 43-101 Technical Report and mineral resource estimate effective October 5th, 2020). The considerable exploration potential at depth and along strike distinguishes the Cariboo Gold Project relative to other development assets as does the historically low, all-in discovery costs of US $19 per ounce. The Cariboo Gold Project is advancing through permitting as a 4,750 tonnes per day underground operation with a feasibility study on track for completion in the first half of 2022. Osisko Development’s project pipeline is complemented by potential near-term production targeted from the San Antonio gold project, located in Sonora Mexico. Osisko Development began trading on the TSX Venture Exchange under the symbol “ODV” on December 2, 2020 and the Company’s 14,789,373 outstanding share purchase warrants were listed on the TSX Venture Exchange under the symbol “ODV.WT” on October 25, 2021.

For further information, please contact Osisko Development Corp.:

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

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