Osisko Development Provides Infill Drilling Update on Its 13,000-Meter Lowhee Program at Cariboo Gold Project; Intercepts Include 596.40 g/t Gold Over 2.0 Meters from 6.1 Meters Downhole, Including 2,293.56 g/t Gold Over 0.5 Meters from 6.6 Meters Downhole

2026-02-12

HIGHLIGHTS

11,025 m of infill drilling completed (5,043 m new results) on 10-m drill spacing in 116 drill holes from August 2025 representing ~80% of the total planned ~13 km infill program

Highlight intercepts include: 596.40 g/t Au over 2.0 m from 6.1 m downhole (including 2,293.56 g/t Au over 0.5 m from 6.6 m downhole), 21.67 g/t Au over 3.5 m from 96.5 m downhole (including 135.44 g/t Au over 0.5 m from 99.5 m downhole), and 21.97 g/t Au over 2.5 m from 48.7 m downhole

Results to date continue to contribute to a more detailed understanding of spatial controls and local variability of the Lowhee Zone

An aggregate total of ~12.1 km (~88%) of total planned drill meters have been completed to date, with full assays and QA/QC pending for the remaining, unreported holes

Infill program anticipated to conclude in early Q2 2026

MONTREAL, Feb. 11, 2026 (GLOBE NEWSWIRE) -- Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") is pleased to announce new infill drilling results from its ongoing 13,000-meter program on 10 meter drill spacing that commenced in August 2025 in the Lowhee Zone of the Company's permitted, 100%-owned Cariboo Gold Project ("Cariboo" or the "Project"), located in central British Columbia ("B.C."), Canada. The six drill hole fans reported herein comprise an additional ~5,043 meters ("m") of underground infill drilling, bringing the total tally of drilling with full results to 11,025 m, or ~80% of the planned total.

Chris Lodder, President, stated, "This tighter drill spacing gives us a better understanding of vein corridor spatial geometries and local variability specific to this part of the Lowhee deposit, while reinforcing the importance of continued drilling in underexplored zones. As this work concludes, the resulting information is expected to help refine infill drill requirements and production designs and sequencing in the Lowhee Deposit of the Cariboo Gold Project."

In total, an aggregate of approximately 12.1 kilometres ("km"), representing ~88% of the total planned drill meters, has now been completed. Full assay results and associated quality assurance and quality control reviews are pending for the remaining holes not reported herein. Infill drilling activities were suspended following the incident reported on January 23, 2026, with the program now anticipated to conclude in early Q2 2026.

DRILL ASSAY HIGHLIGHTS

This news release includes assays from fifty-four (54) underground infill HQ diamond drill ("DD") holes (63.5-millimeter diameter) totaling 5,043 m with depths ranging from 51 to 117 m completed between mid-October 2025 and December 2025 (see Table 1). Assays for six (6) complete drill fans were received by January 11, 2026 (Figure 2). Select photon assay highlights include:

596.40 ("g/t") gold ("Au") over 2.0 m in BMU-25-132 from 6.1 m downhole, including: 2,293.56 g/t over 0.5 m from 6.6 m downhole, and

90.95 g/t over 0.5 m from 7.6 m downhole

21.67 g/t over 3.5 m in BMU-25-145 from 96.5 m downhole, including: 135.44 g/t over 0.5 m from 99.5 m downhole, and

11.88 g/t over 0.6 m from 97.0 m downhole

21.97 g/t over 2.5 m in BMU-25-174 from 48.7 m downhole, including: 88.08 g/t over 0.5 m from 49.7 m downhole, and

20.91 g/t over 0.5 m from 50.2 m downhole

9.21 g/t over 4.9 m in BMU-25-157 from 53.9 m downhole, including: 39.26 g/t over 0.5 m from 54.9 m downhole, and

19.10 g/t over 0.5 m from 55.9 m downhole, and

15.95 g/t over 0.5 m from 55.4 m downhole, and

6.88 g/t over 1.0 m from 53.9 m downhole

10.57 g/t over 4.8 m in BMU-25-157 from 84.9 m downhole, including: 95.61 g/t over 0.5 m from 88.7 m downhole, and

2.84 g/t over 0.5 m from 80.0 m downhole

10.48 g/t over 4.0 m in BMU-25-140 from 11.0 m downhole, including: 54.01 g/t over 0.5 m from 12.4 m downhole, and

28.34 g/t over 0.5 m from 11.9 m downhole

6.91 g/t over 4.5 m in BMU-25-145 from 90.0 m downhole, including: 52.35 g/t over 0.5 m from 92.5 m downhole, and

2.36 g/t over 0.7 m from 90.5 m downhole, and

2.78 g/t over 0.5 m from 90.0 m downhole, and

2.10 g/t over 0.5 m from 92.0 m downhole

5.94 g/t over 4.7 m in BMU-25-163 from 41.1 m downhole, including: 18.91 g/t over 0.5 m from 43.65 m downhole, and

14.44 g/t over 0.65 m from 45.15 m downhole, and

8.94 g/t over 0.8 m from 42.0 m downhole, and

2.47 g/t over 0.5 m from 44.15 m downhole

15.75 g/t over 1.95 m in BMU-25-148 from 108.1 m, including: 30.84 g/t over 0.7 m from 108.1 m downhole, and

11.18 g/t over 0.75 m from 109.3 m downhole

10.46 g/t over 3.0 m in BMU-25-134 from 81.4 m, including: 51.40 g/t over 0.5 m from 82.9 m downhole, and

8.10 g/t over 0.5 m from 81.4 m downhole

Complete assay highlights, including true width estimates, are presented in Table 1 and drill hole locations and orientations are listed in Table 2. Intervals not recovered by drilling were assigned zero grade. Top cuts have not been applied to high grade assays.

DISCUSSION OF RESULTS

Based on the results observed to date, the above cut-off assay composites show a general spatial correlation with the modelled reserve stopes. Individual intercepts are not expected to align precisely with the modelled areas, and a degree of variability within the vein corridors is both anticipated and acceptable as tighter spaced infill drilling informs a refinement of the local reserve model. This work is one of the key objectives of the ongoing program.

Occurrences of above cut-off assays are also being observed in areas not previously included in the reserve model, suggesting potential for upside mineralization. These intervals will be incorporated in the planned remodelling and mineral resource calculation process to determine their implications on the updated local block model and any potential adjustments to planned reserve stopes. In certain areas, this may support the addition of new planned reserve stopes, subject to the final estimation process outcome.

A spatial offset of certain intercepts when compared to the modelled vein corridors and mineral reserve stope shapes is evident in the cross sections. This reflects, in part, the lower spatial accuracy of the surface-based drill hole data compared to underground drilling, which carries higher survey precision, as well as the more oblique angles of intercepts that the surface-based drill holes have with the vein planes. These factors will be accounted for in the vein corridor remodelling process to be undertaken upon conclusion of this program and will serve as an important operational template for future infill drilling used in production stope design.

Figure 1: Cariboo Gold Project deposit map with Location of Lowhee Zone and Cow Portal underground access.

Figure 2: Location and overview of the ongoing 13,000-meter infill drilling campaign.

Figure 3: Lowhee Zone infill select underground drilling highlights (plan view).

Figure 4: Lowhee Zone infill select underground drill assay highlights (this release) with previously released surface and underground diamond drilling results in cross section by fan.

Table 1: Length weighted assay composites and individual samples>=1.8 g/t for Lowhee Zone underground DD.

Drillhole ID From (m)To (m)Length

(m)Au

(g/t)Est. True Width

(m)

BMU-25-115 20.6521.6511.910.79

Including21.1521.650.52.35

28.6529.30.652.930.53

35.536.40.92.090.74

3939.50.52.930.43

80.0581.31.252.100.99

Including80.0580.80.752.21

and80.881.30.51.95

100.5101.30.82.270.66

BMU-25-119 19.9520.450.52.380.47

7373.50.52.910.38

101.31020.73.790.67

BMU-25-122 19.419.90.53.350.50

4848.550.552.490.53

55.556.81.32.641.02

Including56.356.80.56.42

BMU-25-123 17.5180.52.270.41

18.5190.52.950.38

5557.52.51.862.05

Including55.756.40.76.14

91.391.80.52.200.35

BMU-25-125 33.5340.52.440.50

36.1536.650.52.110.49

BMU-25-127 No Significant Assays

BMU-25-128 12.4516.64.151.843.59

Including14.5150.510.73

444513.590.94

798011.970.91

81.5820.52.600.45

8989.50.52.720.45

BMU-25-130 41.643.21.64.751.45

Including42.242.70.53.09

and42.743.20.511.98

BMU-25-131 12.7514.61.852.201.60

Including12.7513.250.57.34

55.7556.250.52.540.38

59.660.10.53.860.43

61.462.20.84.350.75

74.575.512.080.94

Including74.5750.51.90

and7575.50.52.26

8686.50.52.070.45

BMU-25-132 6.18.12596.401.81

Including6.67.10.52293.56

and7.68.10.590.95

52.45541.552.471.50

53.5540.57.040.49

BMU-25-133 48.5549.5512.841.00

Including48.5549.050.55.58

535412.800.94

BMU-25-134 5.36.751.452.191.19

Including5.360.73.81

29.530.050.559.640.45

34.5350.53.500.45

50.852.31.54.781.36

Including51.351.80.512.83

81.484.4310.462.49

Including81.481.90.58.10

and82.983.40.551.40

94.596.11.62.281.35

Including9595.60.63.03

and95.696.10.53.50

BMU-25-135 11.50.51.830.37

6.256.750.544.150.41

3636.750.754.400.61

38.4538.950.54.340.44

80.981.40.511.610.45

878819.080.82

BMU-25-136 No Significant Assays

BMU-25-137 1.6553.352.082.97

Including2.530.52.45

and3415.32

1114.153.155.022.58

Including13.6514.150.529.90

BMU-25-138 6.47.10.72.520.49

46.247.212.090.71

Including46.246.70.53.89

82.482.90.510.490.25

84.885.30.52.450.47

104.2106.11.91.801.51

Including104.7105.40.74.24

BMU-25-139 3333.50.52.630.48

47.6548.150.53.020.47

56.5592.53.272.46

Including56.5570.53.32

and57.5580.512.78

60.162.22.12.992.07

Including60.160.60.58.54

and60.661.20.63.17

66.3567.3512.161.00

Including66.8567.350.54.14

7272.50.52.530.43

BMU-25-140 1115410.483.28

Including11.912.40.528.34

and12.412.90.554.01

61.3653.71.853.20

Including63.3640.76.49

BMU-25-141 111211.940.91

40.545.14.62.503.77

Including43.544.10.616.47

69.870.50.72.220.59

106.7108.721.821.88

Including108.2108.70.56.40

BMU-25-142 32.833.30.52.990.47

52.252.70.53.890.43

54.5550.56.930.48

60.2561.751.52.981.45

Including60.2560.750.53.62

and61.2561.750.54.93

80.681.10.518.530.49

83.5840.53.410.49

BMU-25-143 No Significant Assays

BMU-25-144 474812.600.64

Including4747.50.54.71

8686.50.51.950.38

10110216.410.89

Including101101.50.512.59

BMU-25-145 3636.50.56.090.48

55.557.11.613.581.45

Including55.556.10.622.90

and56.657.10.515.97

6063.053.052.222.87

Including6060.50.58.15

and6161.60.62.50

64.5567.52.951.972.74

Including64.5565.050.53.85

and65.05660.952.24

and6767.50.53.34

9094.54.56.913.97

Including9090.50.52.78

and90.591.20.72.36

and9292.50.52.10

and92.5930.552.35

96.51003.521.673.23

Including9797.60.611.88

and99.51000.5135.44

101.51020.55.630.43

BMU-25-146 2.753.40.652.770.56

1517.62.64.052.44

Including1515.50.511.90

and15.516.10.66.73

BMU-25-147 3.54.513.790.98

Including3.540.55.01

and44.50.52.57

BMU-25-148 19.822.52.73.922.54

Including20.5210.516.72

and21.522.511.94

59.5600.52.550.41

68.769.20.57.790.44

91.3591.850.52.140.41

101.5102.512.300.79

Including101.51020.52.33

and102102.50.52.26

108.1110.051.9515.751.69

Including108.1108.80.730.84

and109.3110.050.7511.18

112.1112.60.53.410.41

BMU-25-149 192012.300.82

Including1919.50.54.35

43.5440.511.900.44

5053.553.553.433.50

Including53.0553.550.521.45

BMU-25-150 No Significant Assays

BMU-25-151 17.518.512.000.88

BMU-25-152 2.64.11.55.771.45

Including3.13.60.516.74

19.722.452.757.312.58

Including19.720.20.522.08

and21.321.850.551.97

and21.8522.450.612.89

2929.50.55.780.46

454722.221.73

Including4545.50.55.46

56.557.512.250.82

Including56.5570.53.97

BMU-25-153 2.12.60.52.200.38

BMU-25-154 49.550.511.900.91

Including5050.50.52.65

BMU-25-155 44.50.53.260.41

21.924.932.362.43

Including23.924.40.511.93

48.448.90.54.250.43

5455118.420.82

Including5454.50.536.46

57.760.22.58.601.92

Including58.259.2117.20

and59.259.70.57.56

BMU-25-156 1.72.20.52.150.46

35.836.30.51.9260.32

38.740.722.101.73

Including38.739.20.53.22

and39.239.70.54.09

55.6557.41.752.921.43

Including56.456.90.52.99

and56.957.40.56.46

71.3571.850.56.500.43

74.375.3119.530.71

Including74.374.80.538.30

BMU-25-157 1.853.51.656.961.17

Including2.352.850.521.49

39.541.92.46.951.70

Including4040.90.915.22

and40.941.40.54.92

53.958.84.99.214.01

Including53.954.916.88

and54.955.40.539.26

and55.455.90.515.95

and55.956.40.519.10

and68.569.40.92.57

77.55813.455.832.33

Including78.0579.05114.58

and79.0579.550.55.63

and79.5580.050.54.45

84.989.74.810.573.39

Including8787.50.52.84

and88.789.20.595.61

99105.46.43.144.53

Including102.8103.450.651.97

and104.45105.40.9517.59

BMU-25-158 26.34.32.002.88

Including5.35.80.515.10

6162.91.92.081.34

Including62.462.90.57.47

BMU-25-159 75.876.350.5522.390.50

899235.142.46

Including90.2590.750.529.46

99.2599.750.55.010.35

BMU-25-160 182021.951.73

192013.35

3537.62.62.622.25

Including353612.19

and3636.50.59.05

102.55104.92.351.941.73

Including102.55103.050.54.78

and104104.90.91.98

106.4107.411.940.71

Including106.4106.90.52.35

108.7109.20.51.960.38

BMU-25-161 2.353.3512.11

Including2.352.850.53.03

613.37.31.916.86

Including6.570.53.71

and8.590.54.37

and9.410.150.752.69

and10.1511.1515.57

50.451.412.360.98

Including50.951.40.54.29

71.5731.52.501.41

Including7272.50.56.32

BMU-25-162 17.7518.7512.020.91

Including17.7518.250.52.83

3036.156.152.025.04

Including3030.50.56.44

and32.833.30.55.23

and35.6536.150.511.63

BMU-25-163 2.93.40.56.640.49

5.46.419.610.82

Including5.96.40.518.94

15.917.51.62.211.47

Including15.916.40.54.32

41.145.84.75.944.58

Including4242.80.88.94

and43.6544.150.518.91

and44.1544.650.52.47

and45.1545.80.6514.44

BMU-25-164 36.5540.33.751.993.62

Including36.5537.050.54.43

and37.0537.550.59.15

BMU-25-165 2.7510.77.952.067.92

Including3.754.250.56.08

and5.756.250.511.01

and7.257.750.51.89

and8.559.20.651.92

and1010.70.74.60

38.5423.52.013.29

Including41.5420.511.24

60.761.20.52.640.47

67.568.512.021.00

Including67.5680.52.80

69.570.61.16.621.10

Including69.570.10.611.91

BMU-25-166 15.5182.52.082.38

Including171814.93

30.7531.250.55.860.43

353832.802.75

Including353615.86

and36.5370.53.58

43.545.522.671.41

Including43.5440.51.91

and4444.50.56.23

and4545.50.52.40

BMU-25-168 34.81.87.761.79

Including33.50.51.97

and44.80.816.21

15.5193.52.403.49

Including17.518.150.6510.70

3333.50.54.690.49

3640.24.22.424.14

Including37.538.10.66.79

and38.138.60.54.99

and38.639.20.63.03

and44.545.20.73.05

48.25501.751.871.52

Including48.25490.753.56

52.5530.52.030.50

5455.51.59.681.45

Including5454.50.58.59

and54.5550.519.69

656612.370.97

Including65.5660.53.19

68.569.512.510.98

Including68.5690.54.62

BMU-25-169 33.133.60.52.180.48

38.139.116.560.77

38.138.60.56.18

38.639.10.56.94

40.140.60.51.910.50

BMU-25-171 2.541.55.271.30

Including2.530.53.44

and33.50.510.60

141514.660.98

Including14.5150.58.28

17.518.512.050.98

Including1818.50.53.59

34.2534.750.56.550.43

36.537.5111.580.97

Including36.5370.520.44

and3737.50.52.71

3940.51.54.211.48

Including3939.50.56.84

and4040.50.55.72

464939.072.82

Including4646.50.59.71

and4747.50.52.70

and47.5480.540.36

67.769.51.85.111.69

Including68.5690.516.17

and6969.50.51.89

BMU-25-172 26.5270.55.800.32

41.8544.352.52.102.35

Including42.3542.850.52.39

and42.8543.350.56.43

4648.52.52.272.35

Including46.5470.510.23

BMU-25-174 14.716.21.512.031.15

Including14.715.20.535.79

35.536.30.817.770.73

48.751.22.521.972.35

Including49.750.20.588.08

and50.250.70.520.91

BMU-25-175 No Significant Assays

BMU-25-177 15.517.11.66.061.03

Including15.516.10.611.67

and16.116.60.55.26

3838.50.53.120.48

70.571.050.552.440.48

BMU-25-178 No Significant Assays

BMU-25-180 1718.51.52.061.30

Including171813.02

28.529.10.63.730.42

81.6582.50.8518.070.60

BMU-25-181 394345.432.83

Including4142120.67

and47.3480.72.54

51.755.741.853.15

Including51.752.20.57.41

and52.753.20.51.84

and53.754.30.61.90

and5555.70.71.86

Table 2: Underground DD collar locations, drillhole orientations, and max depths. Negative dips point down.

Hole IDMine LocationEasting

(UTM z12N)Northing

(UTM z 12N)Elevation

(m)DipAzimuthDepth

(m)

BMU-25-115L1260-ORE-DBY-003-DBY-012596445.85882735.41264.435.0125.3114.0

BMU-25-119L1260-ORE-DBY-003-DBY-012596445.35882735.81263.525.0124.8102.0

BMU-25-122L1260-ORE-DBY-003-DBY-012596445.45882735.71263.115.0125.196.0

BMU-25-123L1260-ORE-DBY-003-DBY-003596493.85882811.71257.1-45.2124.8114.0

BMU-25-125L1260-ORE-DBY-003-DBY-012596445.35882735.81262.64.9125.184.0

BMU-25-127L1260-ORE-DBY-003-DBY-012596445.55882735.81262.2-5.0125.081.0

BMU-25-128L1260-ORE-DBY-003-DBY-003596493.85882811.71257.5-35.0125.199.0

BMU-25-130L1260-ORE-DBY-003-DBY-012596445.75882735.71261.8-14.9125.284.0

BMU-25-131L1260-ORE-DBY-003-DBY-003596493.95882811.81257.8-25.1125.396.0

BMU-25-132L1260-ORE-DBY-003-DBY-012596445.75882735.71261.3-25.0125.090.0

BMU-25-133L1260-ORE-DBY-003-DBY-003596494.05882812.51258.1-15.0124.756.5

BMU-25-134L1260-ORE-DBY-003-DBY-009596463.35882760.11263.034.8125.3114.0

BMU-25-135L1260-ORE-DBY-003-DBY-012596445.55882735.81261.0-35.0124.699.0

BMU-25-136L1260-ORE-DBY-003-DBY-003596494.55882812.11258.3-5.0124.751.0

BMU-25-137L1260-ORE-DBY-003-DBY-009596463.65882759.91262.225.0125.0102.0

BMU-25-138L1260-ORE-DBY-003-DBY-012596445.55882736.01260.9-44.9124.5114.0

BMU-25-139L1260-ORE-DBY-003-DBY-003596494.45882812.21258.75.0125.484.0

BMU-25-140L1260-ORE-DBY-003-DBY-009596463.65882760.01261.715.0125.396.0

BMU-25-141L1260-ORE-DBY-003-DBY-013596441.05882727.71262.635.0125.0117.0

BMU-25-142L1260-ORE-DBY-003-DBY-003596494.35882812.31259.315.0125.084.0

BMU-25-143L1260-ORE-DBY-003-DBY-009596463.65882760.01261.25.0125.081.0

BMU-25-144L1260-ORE-DBY-003-DBY-013596441.05882727.71262.625.0125.0102.0

BMU-25-145L1260-ORE-DBY-003-DBY-003596494.25882812.41259.925.4125.5102.0

BMU-25-146L1260-ORE-DBY-003-DBY-009596463.65882760.01260.8-5.0125.081.0

BMU-25-147L1260-ORE-DBY-003-DBY-013596441.05882727.71262.615.0125.096.0

BMU-25-148L1260-ORE-DBY-003-DBY-003596494.05882812.51260.435.0125.4114.0

BMU-25-149L1260-ORE-DBY-003-DBY-009596464.05882759.81260.5-15.0125.084.0

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ABOUT LOWHEE ZONE

Geological mapping and geochemical sampling were carried out on Barkerville Mountain from 2017-2018, with the Lowhee Zone identified as a high-priority drill target. From 2019 to 2022, a total of 167 surface drill holes were completed, totaling 54,494.5 m.

Lowhee zone access is through Cow portal on the northwestern flank of Barkerville Mountain (Figure 1 and Figure 2) Cow portal construction was completed in Q4 2024 and development of the underground ramp into the Lowhee zone commenced in Q1 2025. Approximately 350 m of development has been advanced within the Lowhee zone deposit at the 1,290 and 1,260-elevation levels since completion of the main access ramp. The probable mineral reserves estimate for the Lowhee Zone includes 104,491 ounces of contained Au (923,162 tonnes grading 3.52 g/t Au) and represents approximately 5% of the total contained gold in the estimated probable mineral reserves for the Cariboo Gold Project.