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Osisko Development Provides Infill Drilling Update on Its 13,000-m Program at Cariboo Gold Project; Intercepts Include 8.56 g/t Au Over 8.5m from 60.5m Depth, and 130.32 g/t Au Over 0.5m from 83.5m Depth

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Osisko Development Provides Infill Drilling Update on Its 13,000-m Program at Cariboo Gold Project; Intercepts Include 8.56 g/t Au Over 8.5m from 60.5m Depth, and 130.32 g/t Au Over 0.5m from 83.5m Depth

 

 

 

 

 

HIGHLIGHTS

  • 5,983 m of infill drilling completed (3,704 m of new results) on 10-m drill spacing in 62 drill holes from August 2025, representing ~44% of the total planned 13,000-m infill program
  • Highlights include: 8.56 g/t Au over 8.5m from 60.5m depth, 16.95 g/t Au over 4.0m from 80m depth (including 130.32 g/t Au over 0.5m from 83.5m depth), and 9.32 g/t Au over 6.0m from 58m depth
  • Results to date continue to be broadly consistent with modelled reserve stopes, indicate potential for upside mineralization in new areas, and provide key spatial controls that will inform an updated local block model and refine future production stope designs
  • An aggregate total of 10,000 m (~72%) of total planned drill meters have been completed to date, with full assays and QA/QC pending for the remaining holes not reported
  • Infill program on track to wrap up in Q1 2026

 

Osisko Development Corp. (NYSE: ODV) (TSX-V: ODV) 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, located in central British Columbia, Canada. The six drill hole fans reported herein comprise an additional ~3,704 meters of underground infill drilling, bringing the total tally of drilling with full results to 5,983 m, or ~44% of the planned total.

 

In total, an aggregate of approximately 10,000 meters, representing ~72% 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.

 

Chris Lodder, President, stated, “We continue to see good alignment of ongoing infill drilling results with our modelled vein corridors and planned stope shapes, along with occurrences of upside mineralized zones outside current reserve outlines. This tighter drill spacing sharpens our understanding of vein corridor spatial geometries and local variability, while reinforcing the importance of infill drilling in underexplored zones. As this work concludes in the first quarter of 2026, the resulting information is expected to help refine production designs and sequencing.”

 

DRILL ASSAY HIGHLIGHTS

 

This news release includes assays from thirty-eight underground infill HQ diamond drill holes (63.5-millimeter diameter) totaling ~3,704 m with depths ranging from 81 to 114 m completed between September 2025 and early November 2025 (see Table 1). Assays for five (5) complete drill fans were received by November 27, 2025 (Figure 2). Select photon assay highlights include:

  • 8.56 grams per tonne gold over 8.5 m from 60.5 m depth in hole BMU-25-090, including:
    • 64.26 g/t over 0.5 m from 63.5 m depth, and
    • 43.80 g/t over 0.5 m from 62.5 m depth, and
    • 12.86 g/t over 0.5 m from 62 m depth, and
    • 10.71 g/t over 0.5 m from 61 m depth, and
    • 3.35 g/t over 0.5 m from 66.5 m depth, and
    • 2.69 g/t over 0.5 m from 63 m depth, and
    • 2.67 g/t over 0.5 m from 64 m depth
  • 16.95 g/t over 4.0 m from 80 m depth in BMU-25-104, including:
    • 130.32 g/t over 0.5 m from 83.5 m depth, and
    • 4.37 g/t over 0.5 m from 80 m depth
  • 9.32 g/t over 6.0 m from 58 m depth in BMU-25-092, including:
    • 51.09 g/t over 0.5 m from 63 m depth, and
    • 26.51 g/t over 0.5 m from 62 m depth, and
    • 23.52 g/t over 0.5 m from 59.7 m depth, and
    • 3.10 g/t over 0.7 m from 60.2 m depth, and
    • 3.21 g/t over 0.5 m from 60.9 m depth
  • 13.22 g/t over 2.65 m from 87.85 m depth in BMU-25-108, including:
    • 65.63 g/t over 0.5 m from 90 m depth, and
    • 3.97 g/t over 0.5 m from 87.85 m depth
  • 26.14 g/t over 2.0 m from 2.5 m depth in BMU-25-110, including:
    • 103.94 g/t over 0.5 m from 3 m depth
  • 11.12 g/t over 4.5 m from 70.5 m depth in BMU-25-084, including:
    • 88.87 g/t over 0.5 m from 71.5 m depth, and
    • 7.08 g/t over 0.5 m from 72 m depth, and
    • 4.76 g/t over 0.5 m from 76.5 m depth
  • 11.23 g/t over 3.9 m from 59.1 m depth in BMU-25-087, including:
    • 43.0 g/t over 1.0 m from 60.8 m depth
  • 7.32 g/t over 4.0 m from 15 m depth in BMU-25-101, including:
    • 57.72 g/t over 0.5 m from 16.5 m depth, and
    • 1.87 g/t over 0.5 m from 17.5 m depth
  • 31.32 g/t over 1.0 m from 42.9 m depth in BMU-25-104, including:
    • 62.15 g/t over 0.5 m from 42.9 m depth
  • 6.48 g/t over 4.55 m from 50.45 m depth in BMU-25-108, including:
    • 21.04 g/t over 0.5 m from 51.45 m depth, and
    • 12.18 g/t over 0.5 m from 51.95 m depth, and
    • 8.71 g/t over 0.55 m from 53.45 m depth, and
    • 7.0 g/t over 0.5 m from 54 m depth, and
    • 4.41 g/t over 0.5 m from 50.95 m depth, and
    • 2.88 g/t over 0.5 m from 52.95 m depth

 

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, there is a positive correlation between the above cut-off assay composites and 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 assay 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-25-084 12.25 16.25 4 2.28 2.83
Including 13.25 13.75 0.5 16.62
28.5 29 0.5 2.20 0.36
32 32.5 0.5 2.23 0.41
33 33.5 0.5 2.80 0.43
36.5 37.5 1 13.52 0.71
Including 36.5 37 0.5 26.84
64 64.5 0.5 2.27 0.35
67 68 1 1.92 0.82
70.5 75 4.5 11.12 4.08
Including 71.5 72 0.5 88.87 0.45
and 72 72.5 0.5 7.08
76.5 77 0.5 4.76 0.32
BMU-25-086 0.4 0.9 0.5 5.40 0.49
64 65.6 1.6 3.11 1.18
Including 65 65.6 0.6 5.63
67.5 68 0.5 3.44 0.45
77.8 78.3 0.5 4.79 0.37
101.5 104 2.5 2.03 1.77
Including 103 103.5 0.5 5.71
and 103.5 104 0.5 2.40
BMU-25-087 18 18.5 0.5 3.76 0.41
19.6 23 3.4 2.26 2.79
Including 20.6 21.1 0.5 14.50
57.5 58.1 0.6 2.68 0.34
59.1 63 3.9 11.23 2.76
Including 60.8 61.8 1 43.00 0.82
73.3 79.3 6 4.56 5.25
Including 74.8 75.3 0.5 6.90 0.32
and 77.3 77.8 0.5 28.19 0.50
and 77.8 78.3 0.5 15.00 0.40
92.3 92.8 0.5 3.76 0.40
105.9 106.4 0.5 3.72 0.41
BMU-25-088 12 16 4 3.60 3.76
Including 12 12.5 0.5 12.85 0.43
and 12.5 13 0.5 13.14 0.49
51 52 1 2.34 0.91
Including 51 51.5 0.5 2.40 0.45
and 51.5 52 0.5 2.27 0.45
54 57.5 3.5 2.84 3.17
Including 57 57.5 0.5 17.00
59.5 60 0.5 1.86 0.43
95.6 96.1 0.5 4.58 0.49
BMU-25-089 45.5 46 0.5 2.56 0.43
59.3 60.7 1.4 5.64 1.25
Including 60.2 60.7 0.5 15.58 0.43
100 100.5 0.5 4.20 0.49
BMU-25-090 6 7 1 13.34 0.71
16.3 18 1.7 1.98 1.54
Including 17 18 1 3.13
50.9 51.9 1 3.09 0.79
Including 51.4 51.9 0.5 5.98
60.5 69 8.5 8.56 7.51
Including 61 61.5 0.5 10.71 0.41
and 62 62.5 0.5 12.86
and 62.5 63 0.5 43.80 0.45
and 63 63.5 0.5 2.69 0.45
and 63.5 64 0.5 64.26 0.43
and 64 64.5 0.5 2.67
and 66.5 67 0.5 3.35 0.45
73 73.5 0.5 2.38 0.38
87.25 87.75 0.5 2.29 0.41
97.35 97.85 0.5 8.30 0.41
101.5 102 0.5 2.74 0.45
BMU-25-091 10.15 11.15 1 1.93 0.50
Including 10.15 10.65 0.5 2.76
19.5 20 0.5 2.18 0.49
22 23 1 3.85 0.97
Including 22.5 23 0.5 7.29
42.5 46 3.5 4.93 3.17
Including 42.5 43 0.5 2.53 0.43
and 43.5 44 0.5 8.03 0.49
and 44.5 45 0.5 13.94 0.43
and 45 45.5 0.5 2.36
and 45.5 46 0.5 6.95
66.5 67.5 1 1.82 0.64
69 69.5 0.5 2.66 0.45
BMU-25-092 11.95 12.45 0.5 3.46 0.48
30 30.5 0.5 6.15 0.47
33.5 34 0.5 2.51 0.48
49.5 51.5 2 1.99 1.88
Including 49.5 50.5 1 2.33 0.97
and 50.5 51 0.5 2.01 0.48
58 64 6 9.32 5.64
Including 59.7 60.2 0.5 23.52
and 60.2 60.9 0.7 3.10 0.63
and 60.9 61.4 0.5 3.21
and 62 62.5 0.5 26.51
and 63 63.5 0.5 51.09
79 79.5 0.5 4.80 0.35
88 90 2 3.31 1.93
Including 88 88.5 0.5 2.40
and 89.5 90 0.5 10.82 0.48
92.75 96 3.25 7.91 3.09
Including 92.75 93.25 0.5 20.81 0.48
and 93.25 93.75 0.5 1.83 0.45
and 93.75 94.25 0.5 6.20 0.43
and 94.25 94.75 0.5 3.39 0.49
and 95.5 96 0.5 18.58 0.49
BMU-25-093 27.15 30.65 3.5 2.29 3.45
Including 27.15 27.65 0.5 7.31 0.49
and 29.15 30.15 1 3.45 0.98
82.5 83 0.5 2.08 0.47
91.6 92.6 1 2.53 0.94
Including 92.1 92.6 0.5 4.65
BMU-25-094 33.9 34.9 1 3.23 0.83
Including 34.4 34.9 0.5 6.28 0.45
48.4 48.9 0.5 4.60 0.47
62.1 65.25 3.15 2.29 2.94
Including 62.1 62.6 0.5 4.90 0.48
and 62.6 63.1 0.5 2.38 0.45
and 63.1 63.6 0.5 3.62 0.43
and 63.6 64.5 0.9 1.86 0.87
68 68.5 0.5 17.63 0.48
BMU-25-095 7 10 3 1.83 2.90
Including 8 8.5 0.5 3.11 0.48
and 9 9.5 0.5 7.18 0.47
41.5 44.5 3 3.51 2.92
Including 41.5 42 0.5 9.54 0.49
and 42 42.5 0.5 2.80 0.49
and 44 44.5 0.5 6.39 0.47
61.4 63.4 2 2.39 1.95
Including 61.9 62.4 0.5 6.26 0.50
and 62.9 63.4 0.5 2.63 0.47
70.5 71 0.5 2.19 0.50
BMU-25-096 72 75.5 3.5 3.89 3.29
Including 73 73.5 0.5 3.49 0.47
and 74.5 75 0.5 14.78 0.47
and 75 75.5 0.5 8.14
80.75 83 2.25 3.93 1.87
Including 80.75 81.25 0.5 14.54 0.33
and 82 82.5 0.5 2.12 0.47
BMU-25-097 37.8 38.8 1 2.50 0.94
Including 38.3 38.8 0.5 4.49 0.47
62 62.5 0.5 3.72 0.48
BMU-25-098 7 10 3 2.76 2.72
Including 7.5 8 0.5 14.84 0.47
14.65 15.65 1 3.65 0.94
Including 14.65 15.15 0.5 7.05 0.47
39.5 43 3.5 6.28 3.23
Including 39.5 40 0.5 30.60 0.46
and 40 40.5 0.5 11.88 0.45
45 45.5 0.5 3.85 0.48
53.2 55.5 2.3 2.78 1.63
Including 54.5 55 0.5 11.64 0.41
62.05 66 3.95 2.27 3.71
Including 62.55 63.1 0.55 4.33 0.52
and 63.1 63.6 0.5 8.03
and 65.5 66 0.5 4.16 0.47
BMU-25-099 24.1 24.6 0.5 23.97 0.45
28.4 29.4 1 5.13 0.71
Including 28.9 29.4 0.5 10.10 0.35
80 80.5 0.5 2.33 0.43
103 103.5 0.5 2.17 0.35
BMU-25-100 14.5 15 0.5 2.16 0.43
18.25 19.75 1.5 2.23 1.41
Including 18.25 18.75 0.5 5.68 0.47
38.3 39.3 1 1.96 0.77
Including 38.3 38.8 0.5 2.82 0.38
52 53 1 2.05 0.91
Including 52 52.5 0.5 3.72 0.45
56 56.5 0.5 11.11 0.50
61.5 65 3.5 2.17 3.42
Including 61.5 62 0.5 10.44 0.47
and 62.5 63 0.5 2.11 0.50
66.5 67 0.5 4.01 0.50
BMU-25-101 15 19 4 7.32 3.94
Including 16.5 17 0.5 52.72 0.50
and 17.5 18 0.5 1.87 0.47
35.5 38 2.5 2.34 2.47
Including 36 36.5 0.5 4.83 0.50
and 37 37.5 0.5 2.64 0.49
and 37.5 38 0.5 2.52 0.49
39.5 40.5 1 3.97 0.97
Including 39.5 40 0.5 7.62 0.48
46.3 48.35 2.05 3.14 2.03
Including 46.8 47.3 0.5 1.88 0.49
and 47.85 48.35 0.5 10.74 0.50
BMU-25-102 7.5 9.5 2 4.67 1.98
Including 7.5 8 0.5 16.90 0.50
and 13.5 14 0.5 2.21 0.48
16 20 4 1.83 3.94
Including 16.5 17 0.5 5.27 0.50
and 18 18.5 0.5 3.84
and 18.5 19 0.5 2.79 0.49
41 41.5 0.5 2.75 0.45
54 54.5 0.5 3.52 0.49
81 82 1 2.85 0.94
Including 81.5 82 0.5 4.80 0.47
BMU-25-103 9 10 1 5.86 0.94
30.5 31 0.5 4.69 0.47
41.6 42.6 1 1.88 0.94
Including 41.6 42.1 0.5 2.22 0.43
46 46.5 0.5 2.46 0.41
53.25 54.85 1.6 7.00 1.56
Including 53.25 53.75 0.5 18.84 0.50
and 54.35 54.85 0.5 3.58 0.47
58 59.5 1.5 2.71 1.23
Including 58 58.5 0.5 5.77 0.41
64.65 65.15 0.5 9.39 0.38
71.1 72.25 1.15 1.96 1.00
Including 71.1 71.75 0.65 3.28 0.56
73.75 75 1.25 2.81 1.08
Including 74.5 75 0.5 6.35 0.43
BMU-25-104 14.5 16 1.5 2.22 1.36
Including 14.5 15 0.5 2.63 0.49
and 15.5 16 0.5 3.41 0.38
19 19.5 0.5 2.60 0.41
42.9 43.9 1 31.32 0.91
Including 42.9 43.4 0.5 62.15 0.47
55 56.5 1.5 1.91 1.41
Including 55 55.5 0.5 5.16 0.43
80 84 4 16.95 3.67
Including 80 80.5 0.5 4.37 0.47
and 83.5 84 0.5 130.32 0.43
BMU-25-105 4.5 5.5 1 3.21 0.98
Including 4.5 5 0.5 5.96 0.49
18.5 19.8 1.3 4.29 1.30
Including 19.1 19.8 0.7 7.86 0.70
41 42 1 2.58 0.97
Including 41 41.5 0.5 3.52
46 46.5 0.5 4.89 0.45
56 58 2 9.16 1.81
Including 56 56.5 0.5 9.90 0.47
and 57 57.5 0.5 24.96 0.47
65.75 66.25 0.5 2.05 0.47
BMU-25-106 11.25 11.75 0.5 3.77 0.43
19 21 2 1.96 1.53
Including 19 20 1 2.55 0.77
23.5 25 1.5 3.84 1.30
Including 24 24.5 0.5 10.36 0.43
BMU-25-107 39.45 40.45 1 9.46 0.82
Including 39.95 40.45 0.5 17.46 0.38
43 44 1 8.02 0.95
Including 43 43.5 0.5 15.88 0.48
49 50.5 1.5 2.17 1.45
Including 49.5 50 0.5 5.53 0.48
BMU-25-108 15.7 16.35 0.65 3.85 0.59
43.4 47.05 3.65 1.83 3.59
Including 43.4 43.9 0.5 7.61 0.49
and 46.35 47.05 0.7 2.09
50.45 55 4.55 6.48 4.22
Including 50.95 51.45 0.5 4.41 0.47
and 51.45 51.95 0.5 21.04 0.43
and 51.95 52.45 0.5 12.18 0.48
and 52.95 53.45 0.5 2.88
and 53.45 54 0.55 8.71 0.52
and 54 54.5 0.5 7.00 0.45
56.25 58.25 2 3.37 1.81
Including 56.25 56.75 0.5 8.54 0.45
and 57.75 58.25 0.5 3.42 0.45
87.85 90.5 2.65 13.22 2.25
Including 87.85 88.35 0.5 3.97 0.40
and 90 90.5 0.5 65.63 0.43
BMU-25-109 20.8 21.3 0.5 1.92 0.43
22.5 23.5 1 2.91 0.87
65.75 69.25 3.5 2.36 3.03
Including 66.75 67.25 0.5 13.57 0.43
70.9 72.4 1.5 4.28 1.30
Including 70.9 71.4 0.5 2.10 0.43
and 71.9 72.4 0.5 10.54
86 86.5 0.5 3.34 0.41
BMU-25-110 2.5 4.5 2 26.14 1.81
Including 3 3.5 0.5 103.94 0.45
42.25 46.75 4.5 2.12 4.08
Including 42.25 42.75 0.5 5.64 0.47
and 44.75 45.25 0.5 6.13 0.45
and 46.25 46.75 0.5 3.21 0.43
53.75 55.25 1.5 17.91 1.40
Including 53.75 54.75 1 26.75
75.7 76.2 0.5 1.87 0.47
80.9 81.7 0.8 2.11 0.61
BMU-25-111 26.5 27 0.5 1.89 0.48
30.5 31.5 1 2.33 0.87
Including 31 31.5 0.5 4.46
60 62 2 11.20 1.81
Including 60 60.5 0.5 39.87 0.43
and 61 61.5 0.5 4.70 0.47
66.5 67 0.5 3.25 0.45
78.5 79 0.5 3.10 0.47
87 87.5 0.5 4.27 0.45
90.35 90.85 0.5 2.62 0.29
BMU-25-112 4.85 5.45 0.6 2.37 0.46
23.75 25.25 1.5 2.03 1.23
Including 23.75 24.25 0.5 2.94 0.43
and 24.75 25.25 0.5 2.96
51 53 2 2.06 1.73
Including 51.5 52 0.5 7.78 0.43
57.5 58.5 1 1.92 0.87
Including 57.5 58 0.5 3.10 0.43
BMU-25-113 55.5 56 0.5 3.43 0.35
83.3 85.75 2.45 4.71 2.12
Including 84.75 85.25 0.5 11.68 0.43
and 85.25 85.75 0.5 10.69
BMU-25-114 0 1.15 1.15 3.17 0.94
Including 0 0.5 0.5 6.48 0.41
3.5 4.25 0.75 2.84 0.68
7.1 8.15 1.05 2.13 0.95
Including 7.1 7.65 0.55 3.71 0.50
9 10 1 2.76 0.91
11 12 1 5.31 0.87
14.5 15 0.5 85.97 0.43
40.5 41 0.5 4.04 0.50
75.3 75.85 0.55 8.90 0.53
BMU-25-116 0.7 1.2 0.5 7.86 0.41
5 6 1 2.37 0.87
82.5 85.65 3.15 1.97 2.81
Including 82.5 83.1 0.6 7.25 0.54
and 84.6 85.15 0.55 2.09 0.42
90 90.5 0.5 2.26 0.43
BMU-25-117 38.8 39.8 1 1.81 0.98
49 50 1 2.37 0.87
Including 49.5 50 0.5 3.98 0.43
70.5 71.5 1 2.56 0.98
Including 70.5 71 0.5 4.92 0.49
BMU-25-118 6.5 7.5 1 9.11 0.82
Including 6.5 7 0.5 18.11 0.41
56.5 57.05 0.55 2.17 0.32
100.5 101.75 1.25 12.95 1.17
Including 101 101.75 0.75 21.26 0.70
107.3 108 0.7 2.13 0.61
BMU-25-120 11 13 2 2.40 1.97
11 11.5 0.5 3.83 0.49
Including 12.5 13 0.5 5.23 0.49
25 25.5 0.5 3.17 0.48
44 44.5 0.5 1.93 0.49
59.5 61.5 2 7.12 1.99
Including 60 60.5 0.5 13.72 0.50
and 60.5 61 0.5 14.43
65.5 66 0.5 2.81 0.49
68.5 69.5 1 2.67 0.94
Including 68.5 69 0.5 4.56 0.47
BMU-25-121 11.5 13.5 2 2.82 1.93
Including 13 13.5 0.5 10.92 0.48
23 23.5 0.5 5.30 0.47
25 25.5 0.5 58.55 0.47
43 44.5 1.5 6.94 1.46
Including 43 43.5 0.5 8.82 0.47
and 44 44.5 0.5 11.87 0.50
61 64 3 6.31 2.78
Including 61 61.5 0.5 10.56 0.43
and 61.5 62 0.5 16.75 0.47
and 63.5 64 0.5 9.92 0.48
65.5 66 0.5 1.81 0.50
69 69.5 0.5 2.18 0.48
78.5 79.5 1 1.98 1.00
Including 79 79.5 0.5 3.80 0.50
BMU-25-124 8.6 10.8 2.2 4.65 1.91
Including 9.6 10.1 0.5 18.47 0.38
41.5 42 0.5 2.41 0.43
66 67 1 14.70 0.94
69 72 3 3.11 2.82
Including 69 69.5 0.5 2.08 0.45
and 70.5 71 0.5 3.27
and 71 71.5 0.5 3.16
and 71.5 72 0.5 8.52 0.48
75 75.5 0.5 9.40 0.48
81 82.5 1.5 3.65 1.45
Including 81 82 1 5.27
BMU-25-126 38.5 39 0.5 31.54 0.43
45.35 46.85 1.5 15.25 1.36
Including 45.35 45.85 0.5 38.22 0.45
Including 46.35 46.85 0.5 7.53 0.45
61 63 2 2.43 1.53
Including 61.5 62 0.5 9.15 0.38
BMU-25-129 21.45 23 1.55 3.93 1.19
Including 21.95 22.45 0.5 10.84 0.38
51.3 52.3 1 1.90 0.71
Including 51.8 52.3 0.5 3.64 0.35
64.6 65.6 1 4.42 0.77
Including 65.1 65.6 0.5 8.73 0.38


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

Drillhole ID Mine Location Easting
(UTM z12N)		 Northing
(UTM z12N)		 Elevation
(m)		 Dip Azimuth Depth
(m)
BMU-25-084 L1260-ORE-003-DBY-006 596479.1 5882785.6 1261.8 -35 125 114
BMU-25-086 L1260-ORE-003-DBY-002 596499.2 5882820.1 1260.0 -35 125 114
BMU-25-087 L1260-ORE-003-DBY-010 596458.5 5882751.7 1264.0 -35 125 114
BMU-25-088 L1260-ORE-003-DBY-006 596479.3 5882785.5 1261.1 -25 125 103.5
BMU-25-089 L1260-ORE-003-DBY-010 596458.2 5882751.9 1263.0 -25 125 102
BMU-25-090 L1260-ORE-003-DBY-002 596499.3 5882820.1 1259.5 -25 125 102
BMU-25-091 L1260-ORE-003-DBY-006 596479.3 5882785.5 1260.6 -15 125 81
BMU-25-092 L1260-ORE-003-DBY-002 596499.3 5882820.1 1259.0 -15 125 96
BMU-25-093 L1260-ORE-003-DBY-010 596458.2 5882751.9 1262.5 -15 125 96
BMU-25-094 L1260-ORE-003-DBY-002 596499.0 5882820.3 1257.5 25 125 93
BMU-25-095 L1260-ORE-003-DBY-006 596479.5 5882785.4 1260.1 -5 125 81
BMU-25-096 L1260-ORE-003-DBY-002 596498.9 5882820.4 1257.3 35 125 96
BMU-25-097 L1260-ORE-003-DBY-010 596458.4 5882751.8 1262.1 -5 125 81
BMU-25-098 L1260-ORE-003-DBY-006 596479.4 5882785.5 1259.7 5 125 81
BMU-25-099 L1260-ORE-003-DBY-002 596498.7 5882820.5 1257.1 45 125 114
BMU-25-100 L1260-ORE-003-DBY-006 596479.3 5882785.5 1259.5 15 125 84
BMU-25-101 L1260-ORE-003-DBY-010 596458.6 5882751.7 1261.8 5 125 81
BMU-25-102 L1260-ORE-003-DBY-006 596479.3 5882785.5 1259.3 25 125 90
BMU-25-103 L1260-ORE-003-DBY-001 596504.5 5882828.9 1260.0 -35 125 114
BMU-25-104 L1260-ORE-003-DBY-006 596479.3 5882785.5 1259.0 35 125 99
BMU-25-105 L1260-ORE-003-DBY-001 596504.5 5882828.9 1259.5 -25 125 102
BMU-25-106 L1260-ORE-003-DBY-006 596479.2 5882785.7 1258.9 45 125 114
BMU-25-107 L1260-ORE-003-DBY-010 596458.6 5882751.7 1261.6 15 125 84
BMU-25-108 L1260-ORE-003-DBY-001 596504.6 5882828.9 1259.2 -15 125 96
BMU-25-109 L1260-ORE-003-DBY-005 596483.7 5882794.2 1261.6 -35 125 114
BMU-25-110 L1260-ORE-003-DBY-010 596458.5 5882751.7 1261.4 25 125 90
BMU-25-111 L1260-ORE-003-DBY-005 596484.0 5882794.1 1260.8 -24 125 102
BMU-25-112 L1260-ORE-003-DBY-010 596458.4 5882751.7 1261.2 35 125 99
BMU-25-113 L1260-ORE-003-DBY-010 596458.3 5882751.7 1261.1 45 125 114
BMU-25-114 L1260-ORE-003-DBY-001 596504.9 5882828.7 1257.4 25 125 90
BMU-25-116 L1260-ORE-003-DBY-001 596504.8 5882828.8 1257.3 35 125 99
BMU-25-117 L1260-ORE-003-DBY-005 596484.0 5882794.0 1260.4 -15 125 81
BMU-25-118 L1260-ORE-003-DBY-001 596504.8 5882828.9 1257.0 45 125 114
BMU-25-120 L1260-ORE-003-DBY-005 596484.0 5882793.9 1260.2 -6 125 84
BMU-25-121 L1260-ORE-003-DBY-005 596484.1 5882794.0 1259.8 5 125 81
BMU-25-124 L1260-ORE-003-DBY-005 596484.2 5882793.9 1259.2 25 125 90
BMU-25-126 L1260-ORE-003-DBY-005 596484.1 5882793.6 1258.8 37 125 99
BMU-25-129 L1260-ORE-003-DBY-005 596484.0 5882793.6 1258.4 44 124 114

 

 

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.

 

In 2019, two southeast-oriented stratigraphic and 22 northwest-southeast oriented drillholes (8,337.0 m) were drilled at the Lowhee Zone. The drilling successfully identified auriferous quartz-carbonate veins at similar orientations to those observed elsewhere on the Cariboo Gold project. Initial 3D geological modelling and resource estimation commenced, and further drilling was recommended.

 

In 2020, 24 northwest-oriented diamond drillholes (10,144.5 m) were drilled. The focus of the exploration program was to test the extent of mineralization along the down-dip and northeast strike-extent of veining. An internal resource estimation of the Lowhee deposit was completed at that time, with further drilling recommended to improve confidence.

 

In 2021, a total of 94 diamond drillholes (29,449.1 m) were drilled. The focus of drilling was to delineate, and infill modelled veins with 25 m spacing. BGM’s resource modelling team produced a mineral resource estimate, and the collection of a bulk sample was recommended.

 

In 2022, a total of 27 diamond drillholes (6,563.90 m) were drilled. There were two main goals with this drill program. The first goal was to infill a potential bulk sample location achieving category conversion from indicated (25 m spacing) to measured (12.5 m spacing). The second goal was to continue to delineate and infill modelled veins with 25 m spacing.

 

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.

 

ABOUT CARIBOO GOLD PROJECT

 

The Cariboo Gold Project is a permitted, 100%-owned feasibility-stage project located in the historic Wells-Barkerville mining camp of central British Columbia, Canada. Spanning approximately 186,740 hectares, the Company’s land package includes 443 mineral titles and covers a ~77-kilometre strike of highly prospective exploration targets extending northwest to southeast. In late 2024, the Project was granted the Mines Act and Environmental Management Act (British Columbia) permits, marking the successful completion of the permitting process for key approvals, solidifying the Project’s shovel-ready status.

 

The Cariboo Gold Project hosts probable mineral reserves of 2.071 million ounces of contained Au (17,815 kt grading 3.62 g/t Au); measured mineral resources of 8,000 ounces of contained Au (47 kt grading 5.06 g/t Au); indicated mineral resources of 1.604 million ounces of contained Au (17,332 kt grading 2.88 g/t Au); and inferred mineral resources of 1.864 million ounces of contained Au (18,774 kt grading 3.09 g/t Au). Mineral resources are reported exclusive of mineral reserves.

 

Technical Reports

 

Scientific and technical information relating to the Cariboo Gold Project and the 2025 feasibility study on the Cariboo Gold Project is supported by the technical report, titled “NI 43-101 Technical Report, Feasibility Study for the Cariboo Gold Project, District of Wells, British Columbia, Canada” and dated June 11, 2025 (with an effective date of April 25, 2025).

 

For readers to fully understand the information in the Cariboo Technical Report, reference should be made to the full text of the Cariboo Technical Report in its entirety, including all assumptions, parameters, qualifications, limitations and methods therein. The Technical Report is intended to be read as a whole, and sections should not be read or relied upon out of context. The Technical Report was prepared in accordance with National Instrument 43-101 – Standards of Disclosure for Mineral Projects and is available electronically on SEDAR+ (www.sedarplus.ca) and on EDGAR (www.sec.gov) under Osisko Development’s issuer profile and on the Company’s website at www.osiskodev.com.

 

Qualified Persons

 

The scientific and technical information contained in this news release has been reviewed, verified and approved by Scott Smith, P. Geo., Vice President, Exploration of Osisko Development, a “qualified person” within the meaning of NI 43-101. Verification includes core photo and three-dimensional review of logged drillhole data and assays consistent with the Company’s standard operating procedures.

 

Quality Assurance– Quality Control

 

Whole core sampling was used for all HQ core completed in the logging facilities following daily QAQC checks for logging and sampling errors. Quality control  samples are inserted at regular intervals in the sample stream, including blanks and reference materials with all sample shipments to monitor laboratory performance. Samples are bagged, labeled, sealed with numbered security tags.

 

Samples are taken by expeditor from the logging facilities direct to MSALABS’s analytical facility in Prince George, B.C., Canada, for preparation and analysis. The MSALABS 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 dried, crushed, and split into sealed containers. Analysis for gold is by gamma ray analysis using the Chrysos PhotonAssay (PA1408X). Samples are bombarded with gamma rays and the resulting signal is sent to the detectors.

 

Alternatively 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 50 gram 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 1,000-gram 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 a continental North American gold development company focused on past-producing mining camps located in mining friendly jurisdictions with district scale potential. The Company’s objective is to become an intermediate gold producer by advancing its flagship permitted 100%-owned Cariboo Gold Project, located in central B.C., Canada. Its project pipeline is complemented by the Tintic Project in the historic East Tintic mining district in Utah, U.S.A., and the San Antonio Gold Project in Sonora, Mexico—brownfield properties with significant exploration potential, extensive historical mining data, access to existing infrastructure and skilled labour. The Company’s strategy is to develop attractive, long-life, socially and environmentally responsible mining assets, while minimizing exposure to development risk and growing mineral resources.

Posted December 15, 2025
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