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

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

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 ~5,043 meters 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, 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 underground infill HQ diamond drill 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 gold 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		20.65	21.65	1	1.91	0.79
	Including	21.15	21.65	0.5	2.35
		28.65	29.3	0.65	2.93	0.53
		35.5	36.4	0.9	2.09	0.74
		39	39.5	0.5	2.93	0.43
		80.05	81.3	1.25	2.10	0.99
	Including	80.05	80.8	0.75	2.21
	and	80.8	81.3	0.5	1.95
		100.5	101.3	0.8	2.27	0.66
BMU-25-119		19.95	20.45	0.5	2.38	0.47
		73	73.5	0.5	2.91	0.38
		101.3	102	0.7	3.79	0.67
BMU-25-122		19.4	19.9	0.5	3.35	0.50
		48	48.55	0.55	2.49	0.53
		55.5	56.8	1.3	2.64	1.02
	Including	56.3	56.8	0.5	6.42
BMU-25-123		17.5	18	0.5	2.27	0.41
		18.5	19	0.5	2.95	0.38
		55	57.5	2.5	1.86	2.05
	Including	55.7	56.4	0.7	6.14
		91.3	91.8	0.5	2.20	0.35
BMU-25-125		33.5	34	0.5	2.44	0.50
		36.15	36.65	0.5	2.11	0.49
BMU-25-127		No Significant Assays
BMU-25-128		12.45	16.6	4.15	1.84	3.59
	Including	14.5	15	0.5	10.73
		44	45	1	3.59	0.94
		79	80	1	1.97	0.91
		81.5	82	0.5	2.60	0.45
		89	89.5	0.5	2.72	0.45
BMU-25-130		41.6	43.2	1.6	4.75	1.45
	Including	42.2	42.7	0.5	3.09
	and	42.7	43.2	0.5	11.98
BMU-25-131		12.75	14.6	1.85	2.20	1.60
	Including	12.75	13.25	0.5	7.34
		55.75	56.25	0.5	2.54	0.38
		59.6	60.1	0.5	3.86	0.43
		61.4	62.2	0.8	4.35	0.75
		74.5	75.5	1	2.08	0.94
	Including	74.5	75	0.5	1.90
	and	75	75.5	0.5	2.26
		86	86.5	0.5	2.07	0.45
BMU-25-132		6.1	8.1	2	596.40	1.81
	Including	6.6	7.1	0.5	2293.56
	and	7.6	8.1	0.5	90.95
		52.45	54	1.55	2.47	1.50
		53.5	54	0.5	7.04	0.49
BMU-25-133		48.55	49.55	1	2.84	1.00
	Including	48.55	49.05	0.5	5.58
		53	54	1	2.80	0.94
BMU-25-134		5.3	6.75	1.45	2.19	1.19
	Including	5.3	6	0.7	3.81
		29.5	30.05	0.55	9.64	0.45
		34.5	35	0.5	3.50	0.45
		50.8	52.3	1.5	4.78	1.36
	Including	51.3	51.8	0.5	12.83
		81.4	84.4	3	10.46	2.49
	Including	81.4	81.9	0.5	8.10
	and	82.9	83.4	0.5	51.40
		94.5	96.1	1.6	2.28	1.35
	Including	95	95.6	0.6	3.03
	and	95.6	96.1	0.5	3.50
BMU-25-135		1	1.5	0.5	1.83	0.37
		6.25	6.75	0.5	44.15	0.41
		36	36.75	0.75	4.40	0.61
		38.45	38.95	0.5	4.34	0.44
		80.9	81.4	0.5	11.61	0.45
		87	88	1	9.08	0.82
BMU-25-136		No Significant Assays
BMU-25-137		1.65	5	3.35	2.08	2.97
	Including	2.5	3	0.5	2.45
	and	3	4	1	5.32
		11	14.15	3.15	5.02	2.58
	Including	13.65	14.15	0.5	29.90
BMU-25-138		6.4	7.1	0.7	2.52	0.49
		46.2	47.2	1	2.09	0.71
	Including	46.2	46.7	0.5	3.89
		82.4	82.9	0.5	10.49	0.25
		84.8	85.3	0.5	2.45	0.47
		104.2	106.1	1.9	1.80	1.51
	Including	104.7	105.4	0.7	4.24
BMU-25-139		33	33.5	0.5	2.63	0.48
		47.65	48.15	0.5	3.02	0.47
		56.5	59	2.5	3.27	2.46
	Including	56.5	57	0.5	3.32
	and	57.5	58	0.5	12.78
		60.1	62.2	2.1	2.99	2.07
	Including	60.1	60.6	0.5	8.54
	and	60.6	61.2	0.6	3.17
		66.35	67.35	1	2.16	1.00
	Including	66.85	67.35	0.5	4.14
		72	72.5	0.5	2.53	0.43
BMU-25-140		11	15	4	10.48	3.28
	Including	11.9	12.4	0.5	28.34
	and	12.4	12.9	0.5	54.01
		61.3	65	3.7	1.85	3.20
	Including	63.3	64	0.7	6.49
BMU-25-141		11	12	1	1.94	0.91
		40.5	45.1	4.6	2.50	3.77
	Including	43.5	44.1	0.6	16.47
		69.8	70.5	0.7	2.22	0.59
		106.7	108.7	2	1.82	1.88
	Including	108.2	108.7	0.5	6.40
BMU-25-142		32.8	33.3	0.5	2.99	0.47
		52.2	52.7	0.5	3.89	0.43
		54.5	55	0.5	6.93	0.48
		60.25	61.75	1.5	2.98	1.45
	Including	60.25	60.75	0.5	3.62
	and	61.25	61.75	0.5	4.93
		80.6	81.1	0.5	18.53	0.49
		83.5	84	0.5	3.41	0.49
BMU-25-143		No Significant Assays
BMU-25-144		47	48	1	2.60	0.64
	Including	47	47.5	0.5	4.71
		86	86.5	0.5	1.95	0.38
		101	102	1	6.41	0.89
	Including	101	101.5	0.5	12.59
BMU-25-145		36	36.5	0.5	6.09	0.48
		55.5	57.1	1.6	13.58	1.45
	Including	55.5	56.1	0.6	22.90
	and	56.6	57.1	0.5	15.97
		60	63.05	3.05	2.22	2.87
	Including	60	60.5	0.5	8.15
	and	61	61.6	0.6	2.50
		64.55	67.5	2.95	1.97	2.74
	Including	64.55	65.05	0.5	3.85
	and	65.05	66	0.95	2.24
	and	67	67.5	0.5	3.34
		90	94.5	4.5	6.91	3.97
	Including	90	90.5	0.5	2.78
	and	90.5	91.2	0.7	2.36
	and	92	92.5	0.5	2.10
	and	92.5	93	0.5	52.35
		96.5	100	3.5	21.67	3.23
	Including	97	97.6	0.6	11.88
	and	99.5	100	0.5	135.44
		101.5	102	0.5	5.63	0.43
BMU-25-146		2.75	3.4	0.65	2.77	0.56
		15	17.6	2.6	4.05	2.44
	Including	15	15.5	0.5	11.90
	and	15.5	16.1	0.6	6.73
BMU-25-147		3.5	4.5	1	3.79	0.98
	Including	3.5	4	0.5	5.01
	and	4	4.5	0.5	2.57
BMU-25-148		19.8	22.5	2.7	3.92	2.54
	Including	20.5	21	0.5	16.72
	and	21.5	22.5	1	1.94
		59.5	60	0.5	2.55	0.41
		68.7	69.2	0.5	7.79	0.44
		91.35	91.85	0.5	2.14	0.41
		101.5	102.5	1	2.30	0.79
	Including	101.5	102	0.5	2.33
	and	102	102.5	0.5	2.26
		108.1	110.05	1.95	15.75	1.69
	Including	108.1	108.8	0.7	30.84
	and	109.3	110.05	0.75	11.18
		112.1	112.6	0.5	3.41	0.41
BMU-25-149		19	20	1	2.30	0.82
	Including	19	19.5	0.5	4.35
		43.5	44	0.5	11.90	0.44
		50	53.55	3.55	3.43	3.50
	Including	53.05	53.55	0.5	21.45
BMU-25-150		No Significant Assays
BMU-25-151		17.5	18.5	1	2.00	0.88
BMU-25-152		2.6	4.1	1.5	5.77	1.45
	Including	3.1	3.6	0.5	16.74
		19.7	22.45	2.75	7.31	2.58
	Including	19.7	20.2	0.5	22.08
	and	21.3	21.85	0.55	1.97
	and	21.85	22.45	0.6	12.89
		29	29.5	0.5	5.78	0.46
		45	47	2	2.22	1.73
	Including	45	45.5	0.5	5.46
		56.5	57.5	1	2.25	0.82
	Including	56.5	57	0.5	3.97
BMU-25-153		2.1	2.6	0.5	2.20	0.38
BMU-25-154		49.5	50.5	1	1.90	0.91
	Including	50	50.5	0.5	2.65
BMU-25-155		4	4.5	0.5	3.26	0.41
		21.9	24.9	3	2.36	2.43
	Including	23.9	24.4	0.5	11.93
		48.4	48.9	0.5	4.25	0.43
		54	55	1	18.42	0.82
	Including	54	54.5	0.5	36.46
		57.7	60.2	2.5	8.60	1.92
	Including	58.2	59.2	1	17.20
	and	59.2	59.7	0.5	7.56
BMU-25-156		1.7	2.2	0.5	2.15	0.46
		35.8	36.3	0.5	1.926	0.32
		38.7	40.7	2	2.10	1.73
	Including	38.7	39.2	0.5	3.22
	and	39.2	39.7	0.5	4.09
		55.65	57.4	1.75	2.92	1.43
	Including	56.4	56.9	0.5	2.99
	and	56.9	57.4	0.5	6.46
		71.35	71.85	0.5	6.50	0.43
		74.3	75.3	1	19.53	0.71
	Including	74.3	74.8	0.5	38.30
BMU-25-157		1.85	3.5	1.65	6.96	1.17
	Including	2.35	2.85	0.5	21.49
		39.5	41.9	2.4	6.95	1.70
	Including	40	40.9	0.9	15.22
	and	40.9	41.4	0.5	4.92
		53.9	58.8	4.9	9.21	4.01
	Including	53.9	54.9	1	6.88
	and	54.9	55.4	0.5	39.26
	and	55.4	55.9	0.5	15.95
	and	55.9	56.4	0.5	19.10
	and	68.5	69.4	0.9	2.57
		77.55	81	3.45	5.83	2.33
	Including	78.05	79.05	1	14.58
	and	79.05	79.55	0.5	5.63
	and	79.55	80.05	0.5	4.45
		84.9	89.7	4.8	10.57	3.39
	Including	87	87.5	0.5	2.84
	and	88.7	89.2	0.5	95.61
		99	105.4	6.4	3.14	4.53
	Including	102.8	103.45	0.65	1.97
	and	104.45	105.4	0.95	17.59
BMU-25-158		2	6.3	4.3	2.00	2.88
	Including	5.3	5.8	0.5	15.10
		61	62.9	1.9	2.08	1.34
	Including	62.4	62.9	0.5	7.47
BMU-25-159		75.8	76.35	0.55	22.39	0.50
		89	92	3	5.14	2.46
	Including	90.25	90.75	0.5	29.46
		99.25	99.75	0.5	5.01	0.35
BMU-25-160		18	20	2	1.95	1.73
		19	20	1	3.35
		35	37.6	2.6	2.62	2.25
	Including	35	36	1	2.19
	and	36	36.5	0.5	9.05
		102.55	104.9	2.35	1.94	1.73
	Including	102.55	103.05	0.5	4.78
	and	104	104.9	0.9	1.98
		106.4	107.4	1	1.94	0.71
	Including	106.4	106.9	0.5	2.35
		108.7	109.2	0.5	1.96	0.38
BMU-25-161		2.35	3.35	1	2.11
	Including	2.35	2.85	0.5	3.03
		6	13.3	7.3	1.91	6.86
	Including	6.5	7	0.5	3.71
	and	8.5	9	0.5	4.37
	and	9.4	10.15	0.75	2.69
	and	10.15	11.15	1	5.57
		50.4	51.4	1	2.36	0.98
	Including	50.9	51.4	0.5	4.29
		71.5	73	1.5	2.50	1.41
	Including	72	72.5	0.5	6.32
BMU-25-162		17.75	18.75	1	2.02	0.91
	Including	17.75	18.25	0.5	2.83
		30	36.15	6.15	2.02	5.04
	Including	30	30.5	0.5	6.44
	and	32.8	33.3	0.5	5.23
	and	35.65	36.15	0.5	11.63
BMU-25-163		2.9	3.4	0.5	6.64	0.49
		5.4	6.4	1	9.61	0.82
	Including	5.9	6.4	0.5	18.94
		15.9	17.5	1.6	2.21	1.47
	Including	15.9	16.4	0.5	4.32
		41.1	45.8	4.7	5.94	4.58
	Including	42	42.8	0.8	8.94
	and	43.65	44.15	0.5	18.91
	and	44.15	44.65	0.5	2.47
	and	45.15	45.8	0.65	14.44
BMU-25-164		36.55	40.3	3.75	1.99	3.62
	Including	36.55	37.05	0.5	4.43
	and	37.05	37.55	0.5	9.15
BMU-25-165		2.75	10.7	7.95	2.06	7.92
	Including	3.75	4.25	0.5	6.08
	and	5.75	6.25	0.5	11.01
	and	7.25	7.75	0.5	1.89
	and	8.55	9.2	0.65	1.92
	and	10	10.7	0.7	4.60
		38.5	42	3.5	2.01	3.29
	Including	41.5	42	0.5	11.24
		60.7	61.2	0.5	2.64	0.47
		67.5	68.5	1	2.02	1.00
	Including	67.5	68	0.5	2.80
		69.5	70.6	1.1	6.62	1.10
	Including	69.5	70.1	0.6	11.91
BMU-25-166		15.5	18	2.5	2.08	2.38
	Including	17	18	1	4.93
		30.75	31.25	0.5	5.86	0.43
		35	38	3	2.80	2.75
	Including	35	36	1	5.86
	and	36.5	37	0.5	3.58
		43.5	45.5	2	2.67	1.41
	Including	43.5	44	0.5	1.91
	and	44	44.5	0.5	6.23
	and	45	45.5	0.5	2.40
BMU-25-168		3	4.8	1.8	7.76	1.79
	Including	3	3.5	0.5	1.97
	and	4	4.8	0.8	16.21
		15.5	19	3.5	2.40	3.49
	Including	17.5	18.15	0.65	10.70
		33	33.5	0.5	4.69	0.49
		36	40.2	4.2	2.42	4.14
	Including	37.5	38.1	0.6	6.79
	and	38.1	38.6	0.5	4.99
	and	38.6	39.2	0.6	3.03
	and	44.5	45.2	0.7	3.05
		48.25	50	1.75	1.87	1.52
	Including	48.25	49	0.75	3.56
		52.5	53	0.5	2.03	0.50
		54	55.5	1.5	9.68	1.45
	Including	54	54.5	0.5	8.59
	and	54.5	55	0.5	19.69
		65	66	1	2.37	0.97
	Including	65.5	66	0.5	3.19
		68.5	69.5	1	2.51	0.98
	Including	68.5	69	0.5	4.62
BMU-25-169		33.1	33.6	0.5	2.18	0.48
		38.1	39.1	1	6.56	0.77
		38.1	38.6	0.5	6.18
		38.6	39.1	0.5	6.94
		40.1	40.6	0.5	1.91	0.50
BMU-25-171		2.5	4	1.5	5.27	1.30
	Including	2.5	3	0.5	3.44
	and	3	3.5	0.5	10.60
		14	15	1	4.66	0.98
	Including	14.5	15	0.5	8.28
		17.5	18.5	1	2.05	0.98
	Including	18	18.5	0.5	3.59
		34.25	34.75	0.5	6.55	0.43
		36.5	37.5	1	11.58	0.97
	Including	36.5	37	0.5	20.44
	and	37	37.5	0.5	2.71
		39	40.5	1.5	4.21	1.48
	Including	39	39.5	0.5	6.84
	and	40	40.5	0.5	5.72
		46	49	3	9.07	2.82
	Including	46	46.5	0.5	9.71
	and	47	47.5	0.5	2.70
	and	47.5	48	0.5	40.36
		67.7	69.5	1.8	5.11	1.69
	Including	68.5	69	0.5	16.17
	and	69	69.5	0.5	1.89
BMU-25-172		26.5	27	0.5	5.80	0.32
		41.85	44.35	2.5	2.10	2.35
	Including	42.35	42.85	0.5	2.39
	and	42.85	43.35	0.5	6.43
		46	48.5	2.5	2.27	2.35
	Including	46.5	47	0.5	10.23
BMU-25-174		14.7	16.2	1.5	12.03	1.15
	Including	14.7	15.2	0.5	35.79
		35.5	36.3	0.8	17.77	0.73
		48.7	51.2	2.5	21.97	2.35
	Including	49.7	50.2	0.5	88.08
	and	50.2	50.7	0.5	20.91
BMU-25-175		No Significant Assays
BMU-25-177		15.5	17.1	1.6	6.06	1.03
	Including	15.5	16.1	0.6	11.67
	and	16.1	16.6	0.5	5.26
		38	38.5	0.5	3.12	0.48
		70.5	71.05	0.55	2.44	0.48
BMU-25-178		No Significant Assays
BMU-25-180		17	18.5	1.5	2.06	1.30
	Including	17	18	1	3.02
		28.5	29.1	0.6	3.73	0.42
		81.65	82.5	0.85	18.07	0.60
BMU-25-181		39	43	4	5.43	2.83
	Including	41	42	1	20.67
	and	47.3	48	0.7	2.54
		51.7	55.7	4	1.85	3.15
	Including	51.7	52.2	0.5	7.41
	and	52.7	53.2	0.5	1.84
	and	53.7	54.3	0.6	1.90
	and	55	55.7	0.7	1.86

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

Hole ID	Mine Location	Easting (UTM z12N)	Northing (UTM z 12N)	Elevation (m)	Dip	Azimuth	Depth (m)
BMU-25-115	L1260-ORE-DBY-003-DBY-012	596445.8	5882735.4	1264.4	35.0	125.3	114.0
BMU-25-119	L1260-ORE-DBY-003-DBY-012	596445.3	5882735.8	1263.5	25.0	124.8	102.0
BMU-25-122	L1260-ORE-DBY-003-DBY-012	596445.4	5882735.7	1263.1	15.0	125.1	96.0
BMU-25-123	L1260-ORE-DBY-003-DBY-003	596493.8	5882811.7	1257.1	-45.2	124.8	114.0
BMU-25-125	L1260-ORE-DBY-003-DBY-012	596445.3	5882735.8	1262.6	4.9	125.1	84.0
BMU-25-127	L1260-ORE-DBY-003-DBY-012	596445.5	5882735.8	1262.2	-5.0	125.0	81.0
BMU-25-128	L1260-ORE-DBY-003-DBY-003	596493.8	5882811.7	1257.5	-35.0	125.1	99.0
BMU-25-130	L1260-ORE-DBY-003-DBY-012	596445.7	5882735.7	1261.8	-14.9	125.2	84.0
BMU-25-131	L1260-ORE-DBY-003-DBY-003	596493.9	5882811.8	1257.8	-25.1	125.3	96.0
BMU-25-132	L1260-ORE-DBY-003-DBY-012	596445.7	5882735.7	1261.3	-25.0	125.0	90.0
BMU-25-133	L1260-ORE-DBY-003-DBY-003	596494.0	5882812.5	1258.1	-15.0	124.7	56.5
BMU-25-134	L1260-ORE-DBY-003-DBY-009	596463.3	5882760.1	1263.0	34.8	125.3	114.0
BMU-25-135	L1260-ORE-DBY-003-DBY-012	596445.5	5882735.8	1261.0	-35.0	124.6	99.0
BMU-25-136	L1260-ORE-DBY-003-DBY-003	596494.5	5882812.1	1258.3	-5.0	124.7	51.0
BMU-25-137	L1260-ORE-DBY-003-DBY-009	596463.6	5882759.9	1262.2	25.0	125.0	102.0
BMU-25-138	L1260-ORE-DBY-003-DBY-012	596445.5	5882736.0	1260.9	-44.9	124.5	114.0
BMU-25-139	L1260-ORE-DBY-003-DBY-003	596494.4	5882812.2	1258.7	5.0	125.4	84.0
BMU-25-140	L1260-ORE-DBY-003-DBY-009	596463.6	5882760.0	1261.7	15.0	125.3	96.0
BMU-25-141	L1260-ORE-DBY-003-DBY-013	596441.0	5882727.7	1262.6	35.0	125.0	117.0
BMU-25-142	L1260-ORE-DBY-003-DBY-003	596494.3	5882812.3	1259.3	15.0	125.0	84.0
BMU-25-143	L1260-ORE-DBY-003-DBY-009	596463.6	5882760.0	1261.2	5.0	125.0	81.0
BMU-25-144	L1260-ORE-DBY-003-DBY-013	596441.0	5882727.7	1262.6	25.0	125.0	102.0
BMU-25-145	L1260-ORE-DBY-003-DBY-003	596494.2	5882812.4	1259.9	25.4	125.5	102.0
BMU-25-146	L1260-ORE-DBY-003-DBY-009	596463.6	5882760.0	1260.8	-5.0	125.0	81.0
BMU-25-147	L1260-ORE-DBY-003-DBY-013	596441.0	5882727.7	1262.6	15.0	125.0	96.0
BMU-25-148	L1260-ORE-DBY-003-DBY-003	596494.0	5882812.5	1260.4	35.0	125.4	114.0
BMU-25-149	L1260-ORE-DBY-003-DBY-009	596464.0	5882759.8	1260.5	-15.0	125.0	84.0
BMU-25-150	L1260-ORE-DBY-003-DBY-013	596441.0	5882727.7	1262.6	4.9	125.0	78.0
BMU-25-151	L1260-ORE-DBY-003-DBY-013	596441.0	5882727.7	1262.6	-5.2	125.1	78.0
BMU-25-152	L1260-ORE-DBY-003-DBY-009	596463.9	5882759.8	1260.2	-25.0	125.0	90.0
BMU-25-153	L1260-ORE-DBY-003-DBY-013	596441.0	5882727.7	1262.6	-14.9	125.1	81.0
BMU-25-154	L1260-ORE-DBY-003-DBY-013	596441.0	5882727.7	1262.6	-25.0	125.0	87.0
BMU-25-155	L1260-ORE-DBY-003-DBY-009	596463.6	5882759.8	1260.0	-35.0	122.8	99.0
BMU-25-156	L1260-ORE-DBY-003-DBY-013	596441.0	5882727.7	1262.6	-35.1	125.0	96.0
BMU-25-157	L1260-ORE-DBY-003-DBY-013	596441.0	5882727.7	1262.6	-45.2	125.2	111.0
BMU-25-158	L1260-ORE-DBY-003-DBY-009	596463.4	5882759.9	1259.7	-45.1	124.9	114.0
BMU-25-159	L1260-ORE-DBY-003-DBY-007	596473.9	5882777.7	1259.8	35.1	125.3	114.0
BMU-25-160	L1260-ORE-DBY-003-DBY-011	596452.2	5882743.2	1263.9	35.1	124.9	114.0
BMU-25-161	L1260-ORE-DBY-003-DBY-007	596473.9	5882777.7	1259.8	25.1	124.8	102.0
BMU-25-162	L1260-ORE-DBY-003-DBY-011	596452.2	5882743.1	1263.5	25.0	124.7	102.0
BMU-25-163	L1260-ORE-DBY-003-DBY-007	596473.9	5882777.7	1259.8	14.9	125.1	72.0
BMU-25-164	L1260-ORE-DBY-003-DBY-011	596452.2	5882743.2	1263.0	14.9	124.8	96.0
BMU-25-165	L1260-ORE-DBY-003-DBY-007	596473.9	5882777.7	1259.8	5.1	125.0	72.0
BMU-25-166	L1260-ORE-DBY-003-DBY-011	596452.4	5882743.1	1262.4	5.0	125.0	81.0
BMU-25-168	L1260-ORE-DBY-003-DBY-007	596473.9	5882777.7	1259.8	-5.0	124.9	75.0
BMU-25-169	L1260-ORE-DBY-003-DBY-011	596452.5	5882743.0	1262.0	-5.1	124.8	81.0
BMU-25-171	L1260-ORE-DBY-003-DBY-007	596473.9	5882777.7	1259.8	-15.0	125.2	72.0
BMU-25-172	L1260-ORE-DBY-003-DBY-011	596452.5	5882743.0	1261.6	-15.4	0.0	84.0
BMU-25-174	L1260-ORE-DBY-003-DBY-007	596473.9	5882777.7	1259.8	-24.9	125.3	90.0
BMU-25-175	L1260-ORE-DBY-003-DBY-011	596452.5	5882743.1	1261.3	-25.3	125.2	90.0
BMU-25-177	L1260-ORE-DBY-003-DBY-007	596473.9	5882777.7	1259.8	-34.9	125.1	99.0
BMU-25-178	L1260-ORE-DBY-003-DBY-011	596452.4	5882743.1	1261.0	-35.1	124.8	99.0
BMU-25-180	L1260-ORE-DBY-003-DBY-007	596473.9	5882777.7	1259.8	-45.1	125.0	114.0
BMU-25-181	L1260-ORE-DBY-003-DBY-011	596452.4	5882743.2	1260.7	-45.1	125.0	114.0

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.

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 ~83-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 Cariboo Technical Report is intended to be read as a whole, and sections should not be read or relied upon out of context. The Cariboo 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 (QC) 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 with district scale potential. The Company’s objective is to become an intermediate gold producer through the development of its flagship, fully permitted, 100%-owned Cariboo Gold Project, located in central British Columbia, Canada. Its project pipeline is complemented by the Tintic Project located in the historic East Tintic mining district in Utah, U.S.A., a brownfield property with significant exploration potential, extensive historical mining data, and access to established infrastructure. Osisko Development is focused on developing long-life mining assets in mining-friendly jurisdictions while maintaining a disciplined approach to capital allocation, development risk management, and mineral inventory growth.

Posted February 12, 2026

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