Osisko Development Intersects 10.85 g/t Au over 14.25 meters and other High- Grade 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
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Osisko Development Intersects 10.85 g/t Au over 14.25 meters and other High-
Grade 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
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 of 91.60 g/t Au over 0.60 meter in hole
CM-21-063, 126.50 g/t Au over 0.50 m eter in CM-21-068, 120.00 g/t Au over 0.50 m eter and
94.10 g/t Au over 0.65 meter in CM -21-084, 201.00 g/t A u over 0.50 m eter 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 10.85 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
• 7.51 g/t Au over 11.65 meters in hole CM-21-061-1
• 29.08 g/t Au over 0.60 meter in hole CM-21-061-1
• 91.60 g/t Au over 0.60 meter in hole CM-21-063
• 42.62 g/t Au over 1.60 meters in hole CM-21-064
• 8.44 g/t Au over 5.20 meters in hole CM-21-064
• 90.70 g/t Au over 0.50 meter in hole CM-21-066
• 13.03 g/t Au over 8.20 meters in hole CM-21-067
• 126.50 g/t Au over 0.50 meter in hole CM-21-068
• 4.57 g/t Au over 13.55 meters in hole CM-21-069 including
• 60.20 g/t Au over 0.75 meter
• 8.11 g/t Au over 6.25 meters in hole CM-21-070
• 3.89 g/t Au over 16.90 meters in hole CM-21-071
• 5.85 g/t Au over 7.55 meters in hole CM-21-076
• 10.85 g/t Au over 14.25 meters in hole CM-21-078
• 75.80 g/t Au over 1.15 meters in hole CM-21-084 including
• 120.00 g/t Au over 0.50 meter
• 14.01 g/t Au over 4.80 meters in hole CM-21-084 including
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• 94.10 g/t Au over 0.65 meter
• 15.74 g/t Au over 3.80 meters in hole CM-21-085
• 19.73 g/t Au over 2.50 meters in hole CM-21-086
• 201.00 g/t Au over 0.50 meter in hole CM-21-086
• 4.98 g/t Au over 8.10 meters in hole CM-21-087
• 12.40 g/t Au over 4.15 meters in hole CM-21-087 including
• 85.00 g/t Au over 0.50 meter
• 100.87 g/t Au over 1.50 meters in hole CM-21-088 including
• 278.00 g/t Au over 0.50 meter
• 113.00 g/t Au over 0.50 meter in hole CM-21-089
• 6.78 g/t Au over 8.00 meters in hole CM-21-089
• 8.44 g/t Au over 4.90 meters in hole CM-21-091
• 5.89 g/t Au over 8.70 meters in hole CM-21-092
• 27.47 g/t Au over 1.90 meters in hole CM-21-093 including
• 46.30 g/t Au over 0.90 meter
• 10.57 g/t Au over 5.35 meters in hole CM-21-093
• 18.72 g/t Au over 2.60 meters in hole CM-21-093
• 80.80 g/t Au over 0.60 meter in hole CM-21-093
• 14.89 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 network s 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 len gth 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.
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Figure 1: Cariboo deposit areas overview map
4
Figure 2: Valley Zone select drilling highlights
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Figure 3: Cross Section of CM-21-088
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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 S an
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 14,789,373 of the Company’s 24,315,223
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
Tel: 514-299-4926
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Forward-looking Statements
Certain statements contained in this press release may be deemed “forward‐looking statements” within the
meaning of applicable Canadian and U.S. securities laws. These forward ‐looking statements, by their
nature, require Osisko Development to make certain assumptions and necessarily involve known and
unknown risks and uncertainties that could cause actual results to differ materially from those expressed or
implied in these forward ‐looking statements. Forward ‐looking statements are not guarantees of
performance. Words such as “may”, “will”, “would”, “could”, “expect”, “believe”, “plan”, “anticipate”, “intend”,
“estimate”, “continue”, or the negative or comparable terminology, as well as terms usually used in the
future and the conditional, are intended to identify forward ‐looking statements. Information contained in
forward‐looking statements is based upon certain material assumptions that were applied in drawing a
conclusion or making a forecast or projection, including management’s perceptions of historical trends,
current conditions and expected future developments, results of further exploration work to define and
expand mineral resources, expected conclusions of optimization studies, that vein corridors continue to be
defined as a high-density network of mineralized quartz within the axis of the last folding event and hosted
within the sandstones and that the deposit remains open for expansion at depth and down plunge, as well
as other considerations that are believed to be appropriate in the circumstances. Osisko Development
considers its assumptions to be reasonable based on information currently available, but cautions the
reader that their assumptions regarding future events, many of which are beyond the control of Osisko
Development, may ultimately prove to be incorrect since they are subject to risks and uncertainties that
affect Osisko Development and its business. Such risks and uncertainties include, among others, risks
relating to the ability of exploration activities (including drill results) to accurately predict mineralization;
errors in management’s geological modelling; the ability of to complete further exploration activities,
including drilling; property and stream interests in the San Antonio gold project; the ability of the Corporation
to obtain required approvals; the results of exploration activities; risks relating to exploration, development
and mining activities; the global economic climate; metal prices; dilution; environmental risks; and
community and non- governmental actions and the responses of relevant governments to the COVID -19
outbreak and the effectiveness of such responses.
For additional information with respect to these and other factors and assumptions underlying the forward ‐
looking statements made in this news release concerning Osisko Development, see the Filing Statement
available electronically on SEDAR (www.sedar.com) under Osisko Development's issuer profile. The
forward‐looking statements set forth herein concerning Osisko Development reflect management's
expectations as at the date of this news release and are subject to change after such date. Osisko
Development disclaims any intention or obligation to update or revise any forward- looking statements,
whether as a result of new information, future events or otherwise, other than as required by law.
Neither the TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in
the policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of
this news release. No stock exchange, securities commission or other regulatory authority has
approved or disapproved the information contained herein.
Table 1: Cariboo Gold Project 2021 Length Weighted Drill Hole Gold Composites
HOLE ID FROM (M) TO (M) LENGTH (M) AU (G/T)
CM-21-061-1 162.00 162.50 0.50 21.60
171.00 182.65 11.65 7.51
Including 174.30 174.90 0.60 27.60
and 174.90 175.60 0.70 23.80
and 180.10 180.70 0.60 25.50
and 181.50 182.65 1.15 24.30
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192.20 192.80 0.60 29.80
209.00 218.75 9.75 3.03
Including 209.00 209.50 0.50 9.64
and 209.50 210.00 0.50 12.55
and 213.20 213.80 0.60 17.00
and 218.25 218.75 0.50 10.85
282.90 286.20 3.30 7.99
Including 285.20 286.20 1.00 24.30
312.80 313.30 0.50 3.04
315.00 316.20 1.20 7.41
CM-21-062 82.75 83.35 0.60 31.40
90.90 92.10 1.20 3.94
CM-21-063 73.70 74.30 0.60 91.60
84.70 85.30 0.60 26.30
127.75 128.60 0.85 3.08
185.30 187.00 1.70 3.66
195.40 196.60 1.20 8.16
Including 195.40 195.90 0.50 14.60
258.50 259.00 0.50 7.62
308.00 309.00 1.00 9.83
317.45 318.00 0.55 10.75
344.20 344.70 0.50 6.86
CM-21-064 87.60 88.15 0.55 5.51
91.00 92.45 1.45 3.79
Including 91.95 92.45 0.50 6.00
101.50 102.00 0.50 8.14
124.75 126.00 1.25 3.48
Including 125.35 126.00 0.65 5.33
135.50 136.00 0.50 6.02
169.70 171.30 1.60 42.62
Including 170.50 171.30 0.80 82.20
374.65 375.95 1.30 6.85
437.70 438.60 0.90 3.81
443.00 448.20 5.20 8.44
Including 443.00 443.50 0.50 10.55
and 447.20 447.70 0.50 8.48
and 447.70 448.20 0.50 24.60
CM-21-065 81.85 82.60 0.75 26.50
153.00 155.05 2.05 9.83
Including 153.00 153.55 0.55 22.90
261.65 263.00 1.35 5.23
273.50 274.20 0.70 5.34
316.85 317.35 0.50 9.20
320.05 320.55 0.50 6.74
357.25 357.80 0.55 7.46
CM-21-066 130.50 131.30 0.80 4.20
294.50 295.00 0.50 90.70
368.85 369.75 0.90 3.28
371.55 372.10 0.55 4.34
385.10 388.00 2.90 4.15