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OSISKO DEVELOPMENT REPORTS UNDERGROUND SAMPLING RESULTS AT TRIXIE, TINTIC PROJECT, INCLUDING: 1,523.54 g/t Au and 126.38 g/t Ag over 1.22 m (44.44 oz/t Au and 3.69 oz/t Ag over 4.00 ft.); GRANTS STOCK OPTIONS AND RSUs

Drill Results Sampling & Geoscience Results Share Capital & Compensation

NYSE: ODV TSXV: ODV NEWS RELEASE

Page 1 of 9

OSISKO DEVELOPMENT REPORTS UNDERGROUND SAMPLING RESULTS

AT TRIXIE, TINTIC PROJECT, INCLUDING: 1,523.54 g/t Au and 126.38 g/t Ag over 1.22 m

(44.44 oz/t Au and 3.69 oz/t Ag over 4.00 ft.); GRANTS STOCK OPTIONS AND RSUs

Montreal, Québec, November 21, 2022 – Osisko Development Corporation (NYSE: ODV, TSXV: ODV)

("Osisko Development" or the "Company") is pleased to announce sampling results from its ongoing

underground exploration program at its 100%-owned Trixie test mine ("Trixie"), within the Company's wider

Tintic Project ("Tintic"), located in the historic East Tintic Mining District in central Utah, U.S.A.

ASSAY HIGHLIGHTS:

Assay highlights include 265 chip samples from 55 mine faces at Trixie. A length-weighted composite for

each face Site ID is presented in Table 1 and individual higher-grade samples are also identified within the

composites. Samples are collected in feet ("ft.") and assays are reported in grams per tonne ("g/t") gold

("Au") and silver ( "Ag"). Conversions to metric and imperial measurements are rounded to two decimal

places. Selected assay highlights include:

• 139.65 g/t Au and 227.05 g/t Ag over 1.37 meters ("m") (4.07 troy ounce per short ton ("oz/t") Au

and 6.62 oz/t Ag over 4.50 ft.) including

o 620.15 g/t Au and 980.67 g/t Ag over 0.30 m (18.09 oz/t Au and 28.60 oz/t Ag over 1.00 ft.)

• 227.59 g/t Au and 1,323.29 g/t Ag over 0.15 m (6.64 oz/t Au and 38.60 oz/t Ag over 0.50 ft.)

• 111.45 g/t Au and 359.02 g/t Ag over 1.22 m (3.25 oz/t Au and 10.47 oz/t Ag over 4.00 ft.) including

o 443.34 g/t Au and 1,419.18 g/t Ag over 0.30 m (12.93 oz/t Au and 41.39 oz/t Ag over 1.00 ft.)

• 404.02 g/t Au and 171.48 g/t Ag over 1.01 m (11.78 oz/t Au and 5.00 oz/t Ag over 3.30 ft.)

• 2,053.60 g/t Au and 773.47 g/t Ag over 0.18 m (59.90 oz/t Au and 22.56 oz/t Ag over 0.60 ft.)

• 1,367.96 g/t Au and 479.47 g/t Ag over 0.46 m (39.90 oz/t Au and 13.98 oz/t Ag over 1.50 ft.)

• 292.12 g/t Au and 106.72 g/t Ag over 0.15 m (8.52 oz/t Au and 3.11 oz/t Ag over 0.50 ft.)

• 261.78 g/t Au and 106.94 g/t Ag over 1.22 m (7.64 oz/t Au and 3.12 oz/t Ag over 4.00 ft.) including

o 658.36 g/t Au and 199.49 g/t Ag over 0.46 m (19.20 oz/t Au and 5.82 oz/t Ag over 1.50 ft.)

• 287.54 g/t Au and 61.65 g/t Ag over 0.91 m (8.39 oz/t Au and 1.80 oz/t Ag over 3.00 ft.) including

o 787.01 g/t Au and 165.50 g/t Ag over 0.30 m (22.95 oz/t Au and 4.83 oz/t Ag over 1.00 ft.)

• 264.36 g/t Au and 30.78 g/t Ag over 2.13 m (7.71 oz/t Au and 0.90 oz/t Ag over 7.00 ft.) including

o 760.36 g/t Au and 47.15 g/t Ag over 0.40 m (22.18 oz/t Au and 1.38 oz/t Ag over 1.30 ft.), and

o 465.21 g/t Au and 85.65 g/t Ag over 0.55 m (13.57 oz/t Au and 2.50 oz/t Ag over 1.80 ft.)

• 401.06 g/t Au and 153.18 g/t Ag over 0.18 m (11.70 oz/t Au and 4.47 oz/t Ag over 0.60 ft.)

• 1,523.54 g/t Au and 126.38 g/t Ag over 1.22 m (44.44 oz/t Au an d 3.69 oz/t Ag over 4.00 ft.)

including

o 262.10 g/t Au and 233.04 g/t Ag over 0.30 m (7.64 oz/t Au and 6.80 oz/t Ag over 1.00 ft.) and

o 5,753.47 g/t Au and 191.28 g/t Ag over 0.30 m (167.81 oz/t Au and 5.58 oz/t Ag over 1.00 ft.)

• 372.56 g/t Au and 294.68 g/t Ag over 1.98 m (10.87 oz/t Au and 8.59 oz/t Ag over 6.50 ft.) including

o 496.58 g/t Au and 423.66 g/t Ag over 0.49 m (14.48 oz/t Au and 12.36 oz/t Ag over 1.60 ft.),

and

o 624.26 g/t Au and 475.98 g/t Ag over 0.79 m (18.21 oz/t Au and 13.88 oz/t Ag over 2.60 ft.)

• 657.83 g/t Au and 319.59 g/t Ag over 1.65 m (19.19 oz/t Au and 9.32 oz/t Ag over 5.40 ft.) including

o 2,389.35 g/t Au and 1,183.93 g/t Ag over 0.43 m (69.69 oz/t Au and 34.53 oz/t Ag over 1.40

ft.)

Page 2 of 9

ACTIVITIES SUMMARY:

• 5,353 oz Au produced at an average grade of 31.3 g/t Au (0.91 oz/t Au since the Company 's

acquisition of Tintic ("Acquisition") on May 27, 2022.

• Current underground test mining activities at Trixie are directed by the exploration sampling and

drilling results.

• Completed 7,315 m ( 24,000 ft.) of reverse circulation ( "RC") drilling and 1,274 m (4,180 ft.) of

diamond drilling since the date of the Acquisition, and four drill rigs currently in operation. Drill assay

results are pending.

• The underground sampling results and drillhole information will form the basis of an initial mineral

resource estimate, expected to be completed by the first quarter of 2023, to support near-term mine

planning and production.

• 500 m (1,640 ft.) of Trixie portal and ramp construction (~30% complete) to date. Once fully

complete, the decline will significantly improve access to the underground workings, expand and

increase underground operations.

• High-grade gold results are present throughout the entire sampled area, and along exploration

cross-cuts expanding the T4 structure up to 25 m (80 ft.) and parallel to T2 (see Figure 2).

• The mineralized structures remain open along strike and at depth and significant potential exists to

expand the known mineralization.

Chris Lodder, President of Osisko Development , commented, "The Trixie underground sampling

results cont inue to demonstrate continuity of high grades associated with the T2 structure with many

samples returning over 100 g/t gold. The recent exploration cross cuts exploring the T4 structure parallel

to the T2 have identified considerable mineralization to the east up to approximately 80 feet wide. Similar

high-grade gold telluride mineralization is also identified in the T4. Given these structures are open along

strike and down dip, we anticipate advancing our exploration efforts to these areas rapidly with four drill rigs

and ongoing advancement of the Trixie decline."

Corporate Matters

In accordance with the Company's stock option plan, the Company has granted incentive stock options to

non-officer employees to purchase an aggregate of 343,500 common shares of the Company. The options

are exercisable at a price of C$6.28 per share of the Company and will expire on November 18, 2027 .

Vesting will occur in three equal parts on the following dates: November 18, 2023, November 18, 2024,

and November 18, 2025, respectively. The Company has also granted an aggregate total of 113,500

restricted share units ("RSUs") to non-officer employees in accordance with the Company's RSU plan. All

RSUs will vest on November 18, 2025.

About Trixie

The Trixie test mine is one of several gold and base metal targets within the larger Tintic Project consisting

of 17,000 acres of patented mining claims and mineral leases within the historic East Tintic Mining District

of Central Utah , USA. The T2 and T4 structures at Trixie show multi -ounce gold grades associated with

high sulphidation epithermal mineralization, structurally controlled and hosted within quartzites. High grade

mineralized material from the T2 and T4 structures is currently being processed via vat leaching on site.

The T2 structure is approximately 0.3 m to 2.4 m (1 to 8 ft.) wide and mineralization consists of native Au,

and rare Au-Ag – rich telluride minerals with quartz. The T4 is a mineralized stockwork zone ranging from

approximately 3 m to 25 m (10 to 80 ft.) and located in the hanging wall of the T2 and is comprised of Au-

Ag rich mineralization in host rock quartzite with quartz-barite-sulphosalt stockwork veining. Mineralization

currently defined over 220 m (720 ft.) in strike and reports consistent multi -ounce gold grades along the

entire strike length.

Face Sampling Methodology

As most structures at Trixie are steeply dipping to the east or west, current sampling procedures are

designed to sample the structure. Chip samples are collected and do not exceed 1.0 m (3 ft.) in length. The

face is washed for safety, and for better identification of mineralization, alteration and structures. The

Page 3 of 9

hanging wall and footwall of the structures are marked up on the face and back, samples intervals are

marked up and follow lithological contacts.

For further information on the Tintic Project, please refer to the technical report titled "Technical Report on

the Tintic Project, East Tintic Mining District, Utah County, Utah, USA" , dated June 10, 2022 (with an

effective date of June 7, 2022) and prepared for the Company by Dr. Thomas A. Henr icksen, QP, C.P.G.

(the "Tintic Technical Report"). Reference should be made to the full text of the Tin tic Technical Report,

which was prepared in accordance with National Instrument 43-101 – Standards of Disclosure for Mineral

Projects ("NI 43 -101") and is available electronically on SEDAR ( www.sedar.com) under Osisko

Development's issuer profile.

Figure 1: Tintic Project Area

Page 4 of 9

Figure 2: Plan Map of Trixie Face Sample Assays

Page 5 of 9

Table 1: 2022 Length Weighted Assay Composites at Trixie

METRIC IMPERIAL

Site ID

Depth

from

(m)

Depth

to (m)

Length

(m)

Au

(g/t)

Ag

(g/t)

Depth

from

(ft.)

Depth

to (ft.)

Length

(ft.)

Au

(oz/t)

Ag

(oz/t)

CH934 0.00 1.83 1.83 0.74 10.58 0.00 6.00 6.00 0.02 0.31

CH934 Including 0.91 1.01 0.09 4.33 135.26 3.00 3.30 0.30 0.13 3.95

CH935 0.00 17.07 17.07 0.19 17.74 0.00 56.00 56.00 0.01 0.52

CH936 0.00 17.07 17.07 1.11 6.17 0.00 56.00 56.00 0.03 0.18

CH936 Including 16.46 17.07 0.61 17.89 8.67 54.00 56.00 2.00 0.52 0.25

CH937 0.00 2.07 2.07 0.05 3.19 0.00 6.80 6.80 0.00 0.09

CH938 0.00 12.19 12.19 0.52 1.29 0.00 40.00 40.00 0.02 0.04

CH939 0.00 1.37 1.37 139.65 227.05 0.00 4.50 4.50 4.07 6.62

CH939 Including 1.07 1.37 0.30 620.15 980.67 3.50 4.50 1.00 18.09 28.60

CH940 0.00 0.91 0.91 10.13 11.14 0.00 3.00 3.00 0.30 0.32

CH940 Including 0.30 0.61 0.30 29.82 33.11 1.00 2.00 1.00 0.87 0.97

CH942 0.00 1.37 1.37 25.52 271.13 0.00 4.50 4.50 0.74 7.91

CH942 Including 0.40 0.55 0.15 227.59 1,323.29 1.30 1.80 0.50 6.64 38.60

CH943 0.00 1.22 1.22 111.45 359.02 0.00 4.00 4.00 3.25 10.47

CH943 F94301 0.00 0.30 0.30 443.34 1,419.18 0.00 1.00 1.00 12.93 41.39

CH944 0.00 5.49 5.49 0.24 0.01 0.00 18.00 18.00 0.01 0.00

CH946 0.00 1.01 1.01 404.02 171.48 0.00 3.30 3.30 11.78 5.00

CH946 Including 0.00 0.61 0.61 47.91 40.85 0.00 2.00 2.00 1.40 1.19

CH946 and 0.61 0.79 0.18 2,053.60 773.47 2.00 2.60 0.60 59.90 22.56

CH947 0.00 8.23 8.23 0.03 2.53 0.00 27.00 27.00 0.00 0.07

CH948 0.00 1.10 1.10 16.95 147.21 0.00 3.60 3.60 0.49 4.29

CH948 Including 0.30 0.79 0.49 35.63 278.09 1.00 2.60 1.60 1.04 8.11

CH949 0.00 1.52 1.52 1.72 25.46 0.00 5.00 5.00 0.05 0.74

CH950 0.00 6.10 6.10 0.40 19.93 0.00 20.00 20.00 0.01 0.58

CH951 0.00 1.83 1.83 2.95 20.49 0.00 6.00 6.00 0.09 0.60

CH952 0.00 1.98 1.98 4.20 58.05 0.00 6.50 6.50 0.12 1.69

CH952 Including 0.61 1.22 0.61 10.08 161.16 2.00 4.00 2.00 0.29 4.70

CH953 0.00 3.05 3.05 0.62 20.64 0.00 10.00 10.00 0.02 0.60

CH954 0.00 1.49 1.49 6.70 43.83 0.00 4.90 4.90 0.20 1.28

CH954 Including 1.10 1.49 0.40 19.51 124.41 3.60 4.90 1.30 0.57 3.63

CH955 0.00 0.88 0.88 1.28 80.54 0.00 2.90 2.90 0.04 2.35

CH956 0.00 6.10 6.10 0.12 2.57 0.00 20.00 20.00 0.00 0.08

CH957 0.00 6.10 6.10 0.18 35.28 0.00 20.00 20.00 0.01 1.03

CH966 0.00 0.46 0.46 1,367.96 479.47 0.00 1.50 1.50 39.90 13.98

CH967 0.00 0.61 0.61 75.38 32.24 0.00 2.00 2.00 2.20 0.94

CH967 Including 0.30 0.46 0.15 292.12 106.72 1.00 1.50 0.50 8.52 3.11

CH968 0.00 1.22 1.22 261.78 106.94 0.00 4.00 4.00 7.64 3.12

CH968 Including 0.15 0.61 0.46 658.36 199.49 0.50 2.00 1.50 19.20 5.82

CH968 and 0.61 1.22 0.61 28.96 63.20 2.00 4.00 2.00 0.84 1.84

CH969 0.00 0.91 0.91 287.54 61.65 0.00 3.00 3.00 8.39 1.80

Page 6 of 9

METRIC IMPERIAL

Site ID

Depth

from

(m)

Depth

to (m)

Length

(m)

Au

(g/t)

Ag

(g/t)

Depth

from

(ft.)

Depth

to (ft.)

Length

(ft.)

Au

(oz/t)

Ag

(oz/t)

CH969 Including 0.00 0.21 0.21 19.23 0.01 0.00 0.70 0.70 0.56 0.00

CH969 and 0.21 0.52 0.30 787.01 165.50 0.70 1.70 1.00 22.95 4.83

CH969 and 0.52 0.91 0.40 47.80 14.96 1.70 3.00 1.30 1.39 0.44

CH970 0.00 1.98 1.98 17.65 4.01 0.00 6.50 6.50 0.51 0.12

CH970 Including 0.00 0.70 0.70 13.56 4.50 0.00 2.30 2.30 0.40 0.13

CH970 and 0.70 0.94 0.24 96.58 19.66 2.30 3.10 0.80 2.82 0.57

CH971 0.00 2.13 2.13 264.36 30.78 0.00 7.00 7.00 7.71 0.90

CH971 Including 0.76 1.16 0.40 760.36 47.15 2.50 3.80 1.30 22.18 1.38

CH971 and 1.16 1.71 0.55 465.21 85.65 3.80 5.60 1.80 13.57 2.50

CH972 0.00 1.34 1.34 79.59 59.04 0.00 4.40 4.40 2.32 1.72

CH972 Including 0.00 0.67 0.67 47.76 60.79 0.00 2.20 2.20 1.39 1.77

CH972 and 0.67 0.85 0.18 401.06 153.18 2.20 2.80 0.60 11.70 4.47

CH973 0.00 1.22 1.22 1,523.54 126.38 0.00 4.00 4.00 44.44 3.69

CH973 Including 0.00 0.30 0.30 262.10 233.04 0.00 1.00 1.00 7.64 6.80

CH973 and 0.30 0.61 0.30 5,753.47 191.28 1.00 2.00 1.00 167.81 5.58

CH973 and 0.61 1.22 0.61 39.30 40.60 2.00 4.00 2.00 1.15 1.18

CH974 0.00 1.98 1.98 372.56 294.68 0.00 6.50 6.50 10.87 8.59

CH974 Including 0.00 0.49 0.49 496.58 423.66 0.00 1.60 1.60 14.48 12.36

CH974 and 0.49 1.28 0.79 624.26 475.98 1.60 4.20 2.60 18.21 13.88

CH975 0.00 1.65 1.65 657.83 319.59 0.00 5.40 5.40 19.19 9.32

CH975 Including 0.00 0.61 0.61 92.49 22.14 0.00 2.00 2.00 2.70 0.65

CH975 and 0.61 1.04 0.43 2,389.35 1,183.93 2.00 3.40 1.40 69.69 34.53

CH976 0.00 1.40 1.40 7.07 48.88 0.00 4.60 4.60 0.21 1.43

CH976 Including 0.00 0.15 0.15 23.02 186.01 0.00 0.50 0.50 0.67 5.43

CH976 and 0.52 0.67 0.15 33.12 231.78 1.70 2.20 0.50 0.97 6.76

CH977 0.00 21.34 21.34 5.02 27.87 0.00 70.00 70.00 0.15 0.81

CH977 Including 3.05 4.57 1.52 31.38 215.95 10.00 15.00 5.00 0.92 6.30

CH977 and 19.81 21.34 1.52 37.88 149.30 65.00 70.00 5.00 1.10 4.35

CH978 0.00 24.38 24.38 0.89 1.18 0.00 80.00 80.00 0.03 0.03

CH978 Including 15.24 16.76 1.52 13.10 13.51 50.00 55.00 5.00 0.38 0.39

CH979 0.00 1.55 1.55 32.75 7.68 0.00 5.10 5.10 0.96 0.22

CH979 Including 0.00 0.15 0.15 60.70 48.20 0.00 0.50 0.50 1.77 1.41

CH980 0.00 1.80 1.80 3.60 18.79 0.00 5.90 5.90 0.10 0.55

CH981 0.00 1.37 1.37 1.47 28.89 0.00 4.50 4.50 0.04 0.84

CH981 Including 0.55 0.76 0.21 6.69 152.86 1.80 2.50 0.70 0.19 4.46

CH983 0.00 6.10 6.10 0.09 0.25 0.00 20.00 20.00 0.00 0.01

CH984 0.00 6.10 6.10 1.13 0.01 0.00 20.00 20.00 0.03 0.00

CH985 0.00 0.98 0.98 0.36 9.24 0.00 3.20 3.20 0.01 0.27

CH986 0.00 1.52 1.52 0.52 3.20 0.00 5.00 5.00 0.02 0.09

CH987 0.00 2.04 2.04 0.63 2.86 0.00 6.70 6.70 0.02 0.08

CH988 0.00 2.13 2.13 0.10 0.68 0.00 7.00 7.00 0.00 0.02

CH989 0.00 1.37 1.37 2.64 0.01 0.00 4.50 4.50 0.08 0.00

Page 7 of 9

METRIC IMPERIAL

Site ID

Depth

from

(m)

Depth

to (m)

Length

(m)

Au

(g/t)

Ag

(g/t)

Depth

from

(ft.)

Depth

to (ft.)

Length

(ft.)

Au

(oz/t)

Ag

(oz/t)

CH990 0.00 1.22 1.22 21.97 26.13 0.00 4.00 4.00 0.64 0.76

CH990 Including 0.00 0.61 0.61 40.25 41.07 0.00 2.00 2.00 1.17 1.20

CH991 0.00 1.43 1.43 1.63 6.56 0.00 4.70 4.70 0.05 0.19

CH992 0.00 2.04 2.04 2.17 4.48 0.00 6.70 6.70 0.06 0.13

CH993 0.00 1.07 1.07 1.85 5.21 0.00 3.50 3.50 0.05 0.15

CH994 0.00 1.49 1.49 2.13 4.22 0.00 4.90 4.90 0.06 0.12

CH994 F99401 0.00 0.30 0.30 9.87 20.64 0.00 1.00 1.00 0.29 0.60

CH995 0.00 1.83 1.83 0.57 3.91 0.00 6.00 6.00 0.02 0.11

CH996 0.00 1.58 1.58 0.03 2.35 0.00 5.20 5.20 0.00 0.07

CH997 0.00 1.52 1.52 17.96 10.85 0.00 5.00 5.00 0.52 0.32

CH997 Including 0.67 1.31 0.64 42.37 19.13 2.20 4.30 2.10 1.24 0.56

CH998 0.00 1.19 1.19 22.79 31.35 0.00 3.90 3.90 0.66 0.91

CH998 Including 0.00 0.43 0.43 62.02 79.21 0.00 1.40 1.40 1.81 2.31

CH999 0.00 1.65 1.65 0.19 1.18 0.00 5.40 5.40 0.01 0.03

Qualified Persons

The scientific and technical information contained in this news release has been prepared in accordance

with NI 43 -101, and has been reviewed and approved by Maggie Layman, P.Geo., Vice President,

Exploration of Osisko Development, and a "qualified person" within the meaning of NI 43-101.

Quality Assurance (QA) – Quality Control (QC)

True width determination is estimated to be approximately 0.3 m to 2.4 m (1 to 8 ft.) wide for the T2 structure

and approximately 3 m to 25 m (10 to 80 ft.) for the T4 mineralized stockwork zone located in the hanging

wall of the T2 structure. All underground face samples are collected by TCM geologists from each of the

active mining faces, with samples transported by the geologists from Trixie to the on -site TCM laboratory

located at the Burgin administrative complex. Underground samples are dried, crushed to <10 mm and a

250 g split is taken. The split is pulverized, and a 30 g Fire Assay with gravimetric finish is completed to

determine gold and silver grades, reported in oz/short ton and g/t.

The TCM Burgin laboratory is not a certified analytical laboratory, but the facility is managed by a qualified

Laboratory Manager with annual auditing by technical staff. Inter -laboratory check assays using ALS

Laboratory as a thi rd-party independent analysis of samples is routinely carried out as part of ongoing

Quality Assurance-Quality Control ("QA/QC") work. Certified OREAS QC standards and blanks are inserted

at regular intervals in the sample stream to monitor laboratory performance.

All drill core and exploration samples are dispatched to ALS Laboratory for offsite sample preparation and

analysis. Samples are assigned a unique sample ID. All geological and sampling information is entered into

Datamine Fusion database. Core i s sawn in half and half are sampled. Certified standards and blanks

inserted into all sample dispatches. Samples are collected by Old Dominion Transportation and dispatched

to ALS Laboratory in Reno, NV. Sample submission forms accompany the samples, and d igital copies

emailed to ALS.

All sample preparation is completed by ALS, including crushing and pulverizing (Prep31) of samples.

Analytical assays include gold and silver by fire assay of 50 g sample with AAS finish (Au-AA26), over limits

by gravimetric analysis (Au-Grav22). Multi element analysis is by four acid digest (ME -MS61). The pulps

are returned to Osisko Development and coarse rejects are disposed after 90 days. Assays are reported

Page 8 of 9

to Osisko Development, and then loaded into Datamine Fusion, QA/QC samples are checked, and assays

merged with sample information for future reporting.

Cautionary Statements

The Company cautions that the decision to commence small-scale underground mining activities and batch

vat leaching at the Trixie test mine has been made without the benefit of a feasibility study, or reported

mineral resources or mineral reserves, demonstrating economic and technical viability, and, as a result

there may be increased uncertainty of achieving any particular level of recovery of materi al or the cost of

such recovery. The Company cautions that historically, such projects have a much higher risk of economic

and technical failure. There is no guarantee that production will continue as anticipated or at all or that

anticipated production co sts will be achieved. The failure to continue production may have a material

adverse impact on the Company's ability to generate revenue and cash flow to fund operations. Failure to

achieve the anticipated production costs may have a material adverse impact on the Company's cash flow

and potential profitability. In continuing current operations at Trixie after closing, the Company will not be

basing its decision to continue such operations on a feasibility study, or reported mineral resources or

mineral reserves demonstrating economic and technical viability. The Company cautions that mining at

Trixie could be suspended at any time.

The Company is subject to the reporting requirements of the applicable Canadian securities laws, and as

a result reports information regarding mineral properties, mineralization and estimates of mineral reserves

and mineral resources, including the information in the Tintic Technical Report and this news release, in

accordance with Canadian reporting requirements, which are govern ed by NI 43 -101. As such, such

information concerning mineral properties, mineralization and estimates of mineral reserves and mineral

resources, including the information in the Tintic Technical Report and this news release, is not comparable

to similar information made public by U.S. companies subject to the reporting and disclosure requirements

of the SEC.

About Osisko Development Corp.

Osisko Development Corp. (NYSE: ODV, TSXV: ODV) is uniquely positioned as a premier gold development

company in North America to advance the Cariboo Gold Project and other Canadian, U.S.A. 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 100% ownership of the

San Antonio gold project, located in Sonora, Mexico and the Tintic Project, located in Utah, U.S.A.

For further information, please contact Osisko Development:

Philip Rabenok

Director, Investor Relations

Email: [email protected]

Tel: +1 (437) 423-3644

FORWARD LOOKING STATEMENTS

Certain statements contained in this news release may be deemed "forward-looking statements" within

the meaning of the United States Private Securities Litigation Reform Act of 1995 and "forward-looking

information" within the meaning of applicable Canadian securities legislation. 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 a re 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.