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Osisko Development Intersects 13.32 g/t Au over 11.40 Meters and 115.5 g/t Au Over 0.95 Meter at Valley Zone

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Osisko Development Intersects 13.32 g/t Au over 11.40 Meters and 115.5 g/t Au Over 0.95 Meter at Valley Zone






Osisko Development Corp. (TSX-V-ODV) is pleased to announce drilling results from the 2021 exploration and category conversion drill program campaign at its Cariboo Gold Project in central British Columbia. A total of 10 diamond drill rigs are currently active on the Project.




  • A total of 138,000 meters have been drilled thus far in 2021. Of that, 46,000 meters have been drilled in the Valley Zone.
  • Recent assay results include holes CM-21-030 to CM-21-043 (Figure 1).
  • CM-21-033 assayed 100.00 g/t Au over 0.50 meter, CM-21-041 assayed 112.50 g/t Au over 0.50 meter and 115.50 g/t Au over 0.95 meter (Figure 2).
  • CM-21-038 intersected multiple mineralized vein corridors including 13.32 g/t Au over 11.40 meters with high-grade samples of 31.40 g/t Au over 0.50 meter, 27.40 g/t Au over 1.00 meter, 23.30 g/t Au over 1.40 meter, 47.40 g/t Au over 1.30 meters, and 20.10 g/t Au over 0.60 meter.
  • CM-21-043 assayed 7.09 g/t Au over 12.70 meters including samples of 19.40 g/t Au over 1.30 meters, 10.45 g/t Au over 1.40 meters, 16.80 g/t Au over 0.60 meters, 14.50 g/t Au over 0.50 meter, 10.55 g/t Au over 0.60 meter and 14.05 g/t Au over 0.50 meter. This interval is open along strike and at depth.
  • Detailed drilling results and a drill hole location plan map are presented at the end of this release.


Chris Lodder, President of Osisko Development commented, “Each of these 14 drill holes returned highly anomalous gold assays in the Valley Zone. The intervals reported are vein corridors comprised of many individual mineralized quartz veins within the sandstone. The gold is associated with the quartz vein-hosted pyrite. During production, these higher-grade samples will be separated using an ore sorter to improve the overall grade of the pre-concentrate.”


Assay Highlights


  • 13.05 g/t Au over 4.65 meters in hole CM-21-030 including
  • 62.70 g/t Au over 0.90 meter
  • 10.83 g/t Au over 3.90 meters in hole CM-21-030 including
  • 71.90 g/t Au over 0.50 meter
  • 63.90 g/t Au over 1.05 meters in hole CM-21-031
  • 51.00 g/t Au over 0.50 meter in hole CM-21-031
  • 16.63 g/t Au over 4.50 meters in hole CM-21-033 including
  • 100.00 g/t Au over 0.50 meter
  • 84.10 g/t Au over 1.10 meters in hole CM-21-034
  • 13.10 g/t Au over 3.15 meters in hole CM-21-034
  • 17.60 g/t Au over 2.90 meters in hole CM-21-035 including
  • 35.60 g/t Au over 0.80 meter
  • 58.10 g/t Au over 0.50 meter in hole CM-21-037
  • 4.44 g/t Au over 10.10 meters in hole CM-21-037
  • 19.37 g/t Au over 2.60 meters in hole CM-21-038 including
  • 55.00 g/t Au over 0.75 meter
  • 13.32 g/t Au over 11.40 meters in hole CM-21-038 including
  • 47.40 g/t Au over 1.30 meters
  • 6.51 g/t Au over 17.90 meters in hole CM-21-039 including
  • 31.90 g/t Au over 1.30 meters
  • 61.50 g/t Au over 0.50 meter in hole CM-21-039
  • 11.15 g/t Au over 3.00 meters in hole CM-21-039
  • 10.23 g/t Au over 2.85 meters in hole CM-21-040
  • 38.50 g/t Au over 0.65 meter in hole CM-21-041
  • 112.50 g/t Au over 0.50 meter in hole CM-21-041
  • 7.38 g/t Au over 11.35 meters in hole CM-21-041
  • 115.50 g/t Au over 0.95 meter in hole CM-21-041
  • 7.98 g/t Au over 8.10 meters in hole CM-21-042 including
  • 92.30 g/t Au over 0.50 meter
  • 11.99 g/t Au over 7.30 meters in hole CM-21-043
  • 6.17 g/t Au over 7.00 meters in hole CM-21-043
  • 7.09 g/t Au over 12.70 meters in hole CM-21-043


Mineralized quartz veins on Cariboo are overall sub-vertical dip and northeast strike. 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 meters and average about 4.5 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.


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 and early exploration stage properties including the Coulon Project and James Bay Properties located in Québec as well as the Guerrero Properties located in Mexico. Osisko Development began trading on the TSX Venture Exchange on December 2, 2020.



Posted October 5, 2021

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