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High-grade Proserpine drill hits for Osisko Gold Group (OGG)

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6-K

Rhea-AI Filing Summary

Osisko Gold Group Inc. reports initial diamond drilling results from the Proserpine greenfield target, about 7 km from its 100%-owned Cariboo Gold Project in central British Columbia. The company states that drilling confirms a gold mineralized system with open pit potential. Fourteen holes totaling 6,463 m intersected mineralization wherever target depths were reached, outlining a footprint of roughly 1.0 km x 0.5 km that remains open in all directions, with mineralization from near surface to depths exceeding 400 m.

Highlighted intercepts include 95.93 g/t Au over 4.60 m at 71 m vertical depth in hole PSP-26-004, including 873.00 g/t Au over 0.50 m, and 5.46 g/t Au over 8.60 m at 77 m vertical depth in PSP-26-001. Drilling has resumed with three rigs and may expand as work continues at Proserpine Southeast and begins at Proserpine Northwest. As context, the permitted, feasibility-stage Cariboo Gold Project hosts probable mineral reserves of 2.071 million ounces of contained gold, plus additional measured, indicated and inferred mineral resources, and these exploration results are described as preliminary and based on incomplete data.

Positive

  • None.

Negative

  • None.
Best Proserpine interval 95.93 g/t Au over 4.60 m Hole PSP-26-004 at approximately 71 m vertical depth
High-grade interval PSP-26-001 5.46 g/t Au over 8.60 m At approximately 77 m vertical depth at Proserpine target
Total drilling reported 6,463 m Fourteen diamond drill holes completed between February and May 2026
Proserpine mineralized footprint 1.0 km x 0.5 km Area of known mineralization, open in all directions
Gold-in-soil anomaly extent 6.0 km x 1.0 km Larger target area hosting the Proserpine anomaly
Probable mineral reserves 2.071 million ounces Au Cariboo Gold Project probable reserves, exclusive of resources
Indicated mineral resources 1.604 million ounces Au Cariboo Gold Project indicated mineral resources
Inferred mineral resources 1.864 million ounces Au Cariboo Gold Project inferred mineral resources
grams per tonne financial
"95.93 grams per tonne ("g/t") gold ("Au") over 4.60 m"
Grams per tonne (g/t) is a measure of how many grams of a precious or base metal are contained in one tonne of rock or ore. It tells investors the concentration of the metal: higher g/t means more metal packed into the same amount of material, which can lower production costs and raise the potential value of a mine. Think of it like the amount of sugar in a slice of cake—the more sugar per slice, the sweeter (and more valuable) each slice is.
inferred mineral resources financial
"inferred mineral resources of 1.864 million ounces of contained Au"
An inferred mineral resource is an estimate of the quantity and grade of minerals in the ground based on limited sampling and geological information, where confidence is low and continuity is uncertain. For investors it signals potential value but also higher risk—like a rough sketch of a hidden treasure that requires much more exploration and testing before you can reliably judge its size or economic worth.
NI 43-101 regulatory
"prepared in accordance with National Instrument 43-101 – Standards of Disclosure"
A Canadian regulatory standard that sets the rules for how mining and exploration companies must report mineral resources and reserves, requiring technical reports prepared or signed off by an independent, certified expert. It matters to investors because it creates a consistent, transparent “inspection report” for mining projects, making it easier to compare prospects, judge the reliability of claims, and assess geological and financial risk before investing.
screen metallic fire assay technical
"flagged during logging for an additional 1,000-gram screen metallic fire assay"
Inductively Coupled Plasma Mass Spectroscopy (ICP-MS) technical
"followed by Inductively Coupled Plasma Atomic Emission Spectroscopy (ICP-AES) and Inductively Coupled Plasma Mass Spectroscopy (ICP-MS)"

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FAQ

What did Osisko Gold Group (ODV) announce about the Proserpine drilling program?
Osisko Gold Group reported first results from 14 diamond drill holes totaling 6,463 m at the Proserpine target. All holes that reached planned depths hit mineralization, outlining a 1.0 km x 0.5 km footprint open in all directions.

Where is the Proserpine target located relative to Osisko Gold Group’s (ODV) Cariboo Gold Project?
The Proserpine regional greenfield target lies approximately 7 km along strike southeast of the permitted, 100%-owned Cariboo Gold Project. It sits within the broader Cariboo Gold property and is part of a ~4 km prospective strike-length corridor.

What are the best gold intercepts reported from Proserpine drilling by ODV?
Key intervals include 95.93 g/t Au over 4.60 m at 71 m vertical depth in hole PSP-26-004, including 873.00 g/t Au over 0.50 m, and 5.46 g/t Au over 8.60 m at 77 m vertical depth in PSP-26-001, among multiple other mineralized zones.

How does the Proserpine mineralized footprint compare with the Cariboo Gold deposit for ODV?
Drilling has tested about 1.0 km x 0.5 km at Proserpine within a larger 6.0 km x 1.0 km anomaly. For context, the currently defined Cariboo Gold deposit extends roughly 4.0 km along strike by 0.5 km in width, illustrating remaining exploration scope.

What mineral reserves and resources does the Cariboo Gold Project hold for Osisko Gold Group (ODV)?
Cariboo hosts probable mineral reserves of 2.071 million oz Au. It also has measured resources of 8,000 oz, indicated resources of 1.604 million oz, and inferred resources of 1.864 million oz of contained gold, reported exclusive of reserves.

What stage is Osisko Gold Group’s (ODV) Cariboo Gold Project and are key permits in place?
Cariboo is a feasibility-stage, 100%-owned project. In late 2024 it received Mines Act and Environmental Management Act permits in British Columbia, which the company notes completed key approvals and supports a “shovel-ready” status.

How reliable are the Proserpine exploration results disclosed by Osisko Gold Group (ODV)?
The company describes the Proserpine exploration results as preliminary and based on incomplete data. A qualified person has reviewed and verified data under NI 43-101, but additional drilling and sampling could yield materially different outcomes.
 

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

Form 6-K

REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of August 2026

Commission File Number: 001-41369

Osisko Gold Group Inc.
(Translation of registrant's name into English)

155 University Avenue, Suite 1450, Toronto, Ontario M5H 3B7
(Address of principal executive office)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.
Form 20-F [   ]      Form 40-F [ X ]

 

 

EXHIBIT INDEX 

Exhibit Number Description
   
99.1 Press Release dated August 5, 2026

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

      Osisko Gold Group Inc.    
  (Registrant)
   
  
Date: August 5, 2026     /s/ Alexander Dann    
  Alexander Dann
  Chief Financial Officer and VP Finance
  

EXHIBIT 99.1

Osisko Gold Confirms Presence of Mineralized System with Open Pit Potential at the Proserpine Target on the Cariboo Gold Project's Regional Property; Exploration Drilling Highlights Include 95.93 g/t Au over 4.60 m at 71 m Vertical Depth and 5.46 g/t Au over 8.60 m at 77 m Vertical Depth

HIGHLIGHTS
  • 6,463 m in 14 drill holes of new surface exploration drilling at the Proserpine regional exploration target, located 7 km along strike to the southeast of the Cariboo Gold deposit
  • Results confirm the presence of an emerging gold mineralized system comprising high-grade structures exhibiting similarities to those at the Cariboo Gold deposit that, together with broader zones of lower-grade mineralization, may indicate potential for open pit mining methods
  • Highlight intercepts include: 95.93 g/t Au over 4.60 m at 71 m vertical depth (including 873.00 g/t Au over 0.50 m), 5.46 g/t Au over 8.60 m at 77 m vertical depth, and 2.17 g/t Au over 14.45 m at 431 m vertical depth
  • Drilling of an additional 26,500 m planned metres, initially with three rigs, is now resuming following a seasonal hiatus
  
   

TORONTO, Aug. 05, 2026 (GLOBE NEWSWIRE) -- Osisko Gold Group Inc. (NYSE: OGG, TSXV: OGG) ("Osisko Gold" or the "Company") is pleased to announce its first set of new diamond drilling results consisting of fourteen holes from the surface exploration program on the Proserpine regional greenfield target, located within the broader Cariboo Gold Project property boundary and approximately 7 kilometres ("km") from the Company's permitted, 100%-owned Cariboo Gold Project (the "Project") in central British Columbia, Canada.

Chris Lodder, President, stated, "We are encouraged by the initial results from the drill campaign at Proserpine, which highlight the potential for a significant new gold mineralized system of scale located only 7 km from the Cariboo Gold deposit. Drilling has intersected high-grade structures showing similarities to those at Cariboo, but also containing areas with broader lower grade mineralization that may indicate potential for bulk mining methods. To date, drilling has broadly tested an area measuring approximately 1.0 km x 0.5 km within a larger target of 6.0 km x 1.0 km gold-in-soil and rock anomaly. For context, the currently defined Cariboo Gold deposit extends approximately 4.0 km along strike by 0.5 km in width, underscoring the exploration potential that remains to be tested at Proserpine."

DRILL ASSAY HIGHLIGHTS

This news release contains assays from fourteen (14) diamond drillholes ("DD") totalling 6,463 meters ("m") with depths ranging from 36.0 to 734.3 m (see Table 1 and Figure 3) completed between February and May of 2026. All holes were collared in HQ (63.5 millimetre diameter) and reduced to NQ (47.6 millimetre diameter) where necessary to continue advancing. Estimated true widths of intercepts are provided in Table 1. Select highlights include:

  • 95.93 grams per tonne ("g/t") gold ("Au") over 4.60 m at 71 m vertical depth in PSP-26-004, including:
    • 873.00 g/t Au over 0.50 m, and
    • 3.77 g/t Au over 1.20 m
  • 5.46 g/t Au over 8.60 m at 77 m vertical depth in PSP-26-001 (Figure 1), including:
    • 16.05 g/t Au over 1.10 m, and
    • 12.50 g/t Au over 0.87 m, and
    • 10.25 g/t Au over 0.50 m, and
    • 5.97 g/t Au over 0.70 m, and
    • 5.21 g/t Au over 0.80 m, and
    • 3.36 g/t Au over 0.60 m, and
    • 1.50 g/t Au over 0.90 m, and
    • 1.18 g/t Au over 0.90 m
  • 2.17 g/t Au over 14.45 m at 431 m vertical depth in PSP-26-001, including:
    • 35.10 g/t Au over 0.65 m, and
    • 8.61 g/t Au over 0.50 m, and
    • 2.21 g/t Au over 0.50 m, and
    • 1.21 g/t Au over 0.50 m
  • 1.46 g/t Au over 12.40 m at 295 m vertical depth in PSP-26-003, including:
    • 15.40 g/t Au over 1.00 m, and
    • 2.02 g/t Au over 0.50 m
  • 3.17 g/t Au over 5.45 m at 334 m vertical depth in PSP-26-009, including:
    • 19.30 g/t Au over 0.60 m, and
    • 9.52 g/t Au over 0.50 m, and
    • 1.22 g/t Au over 0.50 m
  • 1.30 g/t Au over 12.00 m at 27 m vertical depth in PSP-26-011, including:
    • 9.92 g/t Au over 0.70 m, and
    • 6.19 g/t Au over 0.50 m, and
    • 3.63 g/t Au over 0.50 m, and
    • 3.75 g/t Au over 0.50 m, and
    • 1.50 g/t Au over 0.65 m
  • 2.93 g/t Au over 5.15 m at 233 m vertical depth in PSP-26-001, including:
    • 15.60 g/t Au over 0.95 m
  • 4.30 g/t Au over 3.10 m at 226 m vertical depth in PSP-26-001, including:
    • 18.75 g/t Au over 0.50 m, and
    • 7.54 g/t Au over 0.50 m
  • 2.79 g/t Au over 4.00 m at 184 m vertical depth in PSP-26-014, including:
    • 11.55 g/t Au over 0.90 m
  • 2.30 g/t Au over 4.50 m at 17 m vertical depth in PSP-26-007, including:
    • 12.25 g/t Au over 0.50 m, and
    • 5.62 g/t Au over 0.50 m, and
    • 1.73 g/t Au over 0.50 m, and
    • 1.09 g/t Au over 0.50 m

Results to date have expanded the footprint of known mineralization at Proserpine to approximately 1.0 km along strike by 0.5 km in width, with mineralization remaining open in all directions. All drill holes that reached their intended target depths encountered mineralization, providing a compelling basis for systematic follow-up drilling. Mineralization was encountered from near surface to vertical depths exceeding 400 metres. In particular, hole PSP-26-001 returned several notable mineralized intercepts beginning at a vertical depth of approximately 55 metres and with the deepest at more than 400 metres from surface.

FIGURE 1: 5.46 g/t Au over 8.6 m in PSP-26-001 at approximately 77 m vertical depth.

Drilling also intersected significant intervals of the prospective siliceous sandstone unit, confirming its presence within the target area and providing additional information to refine the geologic model. Based on preliminary observations to date, the siliceous sandstone is believed to represent a more favourable host for mineralization than the calcareous sandstone (see Figure 3).

Diamond drilling at Proserpine has resumed with three active drill rigs following a brief, planned seasonal hiatus. Additional drill rigs may be mobilized as warranted as the planned drill program continues to expand the mineralized footprint and increase drillhole density at Proserpine Southeast, while initiating first-pass drilling at previously untested targets at Proserpine Northwest.

FIGURE 2: Cariboo Gold regional overview.

FIGURE 3: Plan view of Proserpine diamond drilling with select intercept highlights.

FIGURE 4: Proserpine diamond drilling select intercept highlights in long section.

TABLE 1: Select manual composite and individual sample highlights greater than or equal to 1.0 g/t Au.

Drillhole ID   From (m) To (m) Length (m) Au g/t Est. True
Width (m)		 Approx. Vertical
Depth (m)
PSP-26-001   71.50 72.15 0.65 1.16 0.42 55
    79.70 83.60 3.90 1.18 2.95 62
  Including 80.20 81.30 1.10 2.71    
  and 83.05 83.60 0.55 1.67    
    97.00 105.60 8.60 5.46 6.51 77
  Including 97.50 98.20 0.70 5.97    
  and 98.20 99.00 0.80 5.21    
  and 100.73 101.60 0.87 12.50    
  and 101.60 102.70 1.10 16.05    
  and 102.70 103.20 0.50 10.25    
  and 103.20 104.10 0.90 1.50    
  and 104.10 105.00 0.90 1.18    
  and 105.00 105.60 0.60 3.36    
    146.40 147.10 0.70 1.49 0.35 112
    165.95 166.70 0.75 1.60 0.58 126
    288.95 289.60 0.65 1.23 0.56 219
    290.45 290.95 0.50 1.11 0.45 220
    297.80 300.90 3.10 4.30 2.46 226
  Including 297.80 298.30 0.50 7.54    
  and 300.40 300.90 0.50 18.75    
    304.70 309.85 5.15 2.93 3.95 233
  Including 304.70 305.65 0.95 15.60    
    312.70 313.25 0.55 1.21 0.42 237
    334.80 335.30 0.50 1.74 0.38 254
    343.95 344.45 0.50 3.98 0.32 261
    494.70 495.20 0.50 3.04 0.41 376
    559.85 562.35 2.50 1.04 2.11 420
  Including 561.85 562.35 0.50 4.53    
    572.00 586.45 14.45 2.17 11.80 431
  Including 574.25 574.75 0.50 1.21    
  and 574.75 575.25 0.50 2.21    
  and 577.55 578.20 0.65 35.10    
  and 585.45 585.95 0.50 8.61    
    591.50 593.00 1.50 1.10 0.96 440
PSP-26-002   15.50 16.00 0.50 1.00 0.38 12
    36.60 37.20 0.60 2.57 0.39 26
    47.00 47.50 0.50 3.25 0.32 34
    52.10 52.60 0.50 1.20 0.35 37
    73.50 74.50 1.00 2.54 0.82 52
  Including 74.00 74.50 0.50 4.68    
    89.70 90.20 0.50 2.83 0.35 63
    95.10 95.60 0.50 1.04 0.25 67
    165.90 166.40 0.50 1.33 0.25 115
    179.60 180.10 0.50 1.61 0.46 124
    194.20 194.95 0.75 1.83 0.61 134
PSP-26-003   83.60 84.10 0.50 2.98 0.35 66
    145.15 145.65 0.50 2.58 0.39 113
    169.35 171.25 1.90 4.93 1.34 133
  Including 170.20 170.75 0.55 16.15    
    183.00 184.00 1.00 1.20 0.77 144
  Including 183.00 183.50 0.50 2.27    
    187.50 191.00 3.50 1.12 2.76 148
  Including 187.50 189.00 1.50 1.17    
  and 190.00 190.50 0.50 3.45    
    294.10 299.60 5.50 1.03 4.13 235
  Including 299.10 299.60 0.50 8.10    
    329.00 334.00 5.00 1.10 3.97 262
  Including 331.25 331.75 0.50 7.78    
    367.00 379.40 12.40 1.46 10.31 295
  Including 370.50 371.50 1.00 15.40    
  and 373.60 374.10 0.50 2.02    
    395.80 396.30 0.50 1.18 0.38 313
    411.10 417.70 6.60 1.09 5.07 326
  Including 412.10 412.60 0.50 1.05    
  and 412.60 413.10 0.50 1.11    
  and 413.10 413.60 0.50 6.22    
  and 413.60 414.20 0.60 1.89    
  and 415.20 415.70 0.50 1.47    
  and 415.70 416.20 0.50 1.32    
    419.20 420.30 1.10 1.07 0.60 330
  Including 419.70 420.30 0.60 1.80    
  and 430.10 430.60 0.50 2.30 0.09 338
    439.30 442.20 2.90 1.00 2.33 345
  Including 439.30 440.00 0.70 1.04    
  and 440.50 441.15 0.65 2.68    
  and 474.90 475.40 0.50 2.26 0.32 368
    478.50 479.00 0.50 1.53 0.43 370
    505.85 506.35 0.50 1.53 0.41 386
    533.50 534.00 0.50 6.14 0.29 402
PSP-26-004   110.40 115.00 4.60 95.93 3.25 71
  Including 112.30 112.80 0.50 873.00    
  and 113.80 115.00 1.20 3.77    
PSP-26-005   55.05 58.60 3.55 1.08 1.91 42
  Including 55.05 55.60 0.55 4.67    
  and 58.10 58.60 0.50 2.33    
    76.85 79.05 2.20 3.11 1.07 59
  Including 77.35 78.00 0.65 2.77    
  and 78.00 79.05 1.05 4.58    
  and 135.35 135.85 0.50 1.05 0.45 101
    194.00 194.50 0.50 1.12 0.32 147
    227.60 228.20 0.60 1.10 0.10 172
    241.50 242.00 0.50 1.24 0.26 182
    294.00 294.50 0.50 2.17 0.45 224
    312.75 313.75 1.00 1.03 0.89 239
  Including 312.75 313.25 0.50 1.04    
  and 313.25 313.75 0.50 1.02    
    320.00 321.00 1.00 1.33 0.94 244
    402.40 402.90 0.50 1.17 0.43 306
    412.20 413.30 1.10 1.43 0.72 314
  Including 412.20 412.80 0.60 1.82    
    414.50 416.45 1.95 1.04 1.05 315
  Including 415.75 416.45 0.70 2.34    
    522.30 523.20 0.90 1.63 0.52 384
PSP-26-006   139.70 140.20 0.50 1.05 0.45 104
    161.00 161.50 0.50 1.16 0.29 121
    251.60 252.10 0.50 20.20 0.35 194
    293.60 294.60 1.00 10.21 0.77 227
  Including 293.60 294.10 0.50 20.30    
    315.50 316.50 1.00 1.82 0.94 243
  Including 316.00 316.50 0.50 3.36    
  and 323.50 324.00 0.50 1.86 0.35 249
    468.50 470.00 1.50 4.86 1.27 361
  Including 468.50 469.00 0.50 11.50    
  and 469.50 470.00 0.50 3.06    
    476.50 477.00 0.50 1.33 0.43 366
    499.00 499.50 0.50 1.22 0.43 383
    509.90 510.90 1.00 1.15 0.42 392
  Including 510.40 510.90 0.50 1.41    
    513.70 514.50 0.80 2.25 0.34 395
PSP-26-007   25.80 30.30 4.50 2.30 3.95 17
  Including 25.80 26.30 0.50 1.73    
  and 27.30 27.80 0.50 5.62    
  and 29.30 29.80 0.50 12.25    
  and 29.80 30.30 0.50 1.09    
    74.05 74.55 0.50 1.05 0.32 44
    80.05 80.55 0.50 1.81 0.43 46
    112.50 113.00 0.50 2.23 0.14 62
    165.35 167.00 1.65 1.35 0.56 90
  Including 166.00 167.00 1.00 2.00    
    174.90 176.80 1.90 1.19 0.80 95
  Including 174.90 175.40 0.50 1.98    
  and 175.40 175.90 0.50 2.37    
    216.35 216.85 0.50 2.35 0.40 116
    266.00 266.85 0.85 1.17 0.43 143
    332.05 338.55 6.50 1.54 3.08 184
  Including 334.25 335.00 0.75 1.16    
  and 335.00 335.50 0.50 2.29    
  and 336.00 336.75 0.75 9.46    
PSP-26-008   57.15 57.65 0.50 1.40 0.25 32
    215.50 216.00 0.50 1.11 0.35 122
    222.10 223.25 1.15 1.74 0.94 127
  Including 222.10 222.75 0.65 2.91    
  and 226.70 227.20 0.50 3.57    
PSP-26-009   172.45 175.45 3.00 1.35 2.16 142
  Including 172.45 172.95 0.50 7.38    
    381.55 383.20 1.65 2.13 0.92 311
  Including 381.55 382.20 0.65 1.67    
  and 382.20 382.70 0.50 4.75    
    388.95 389.50 0.55 15.20 0.35 317
    399.95 400.45 0.50 1.58 0.32 326
    407.65 413.10 5.45 3.17 3.67 334
  Including 409.40 409.90 0.50 9.52    
  and 409.90 410.50 0.60 19.30    
  and 410.50 411.00 0.50 1.22    
    461.55 464.35 2.80 1.72 1.98 377
  Including 462.45 462.95 0.50 9.06    
PSP-26-012 No Significant Assays        
PSP-26-011   41.50 53.50 12.00 1.30 6.88 27
  Including 41.50 42.20 0.70 9.92    
  and 45.50 46.00 0.50 3.75    
  and 46.50 47.00 0.50 6.19    
  and 50.75 51.40 0.65 1.50    
  and 53.00 53.50 0.50 3.63    
    101.50 102.85 1.35 2.30 1.07 57
  Including 101.50 102.00 0.50 1.65    
  and 102.00 102.85 0.85 2.69    
    313.80 315.05 1.25 4.18 1.11 180
  Including 313.80 314.45 0.65 1.44    
  and 314.45 315.05 0.60 7.14    
    319.00 320.00 1.00 2.35 0.71 183
    325.00 328.00 3.00 1.36 2.30 187
  Including 325.00 326.00 1.00 1.07    
  and 327.00 328.00 1.00 2.95    
    382.25 383.00 0.75 1.50 0.57 222
PSP-26-012 No Significant Assays      
    11.00 12.50 1.50 1.41 1.15 7
  Including 11.00 11.50 0.50 3.49    
    207.25 208.25 1.00 2.02 0.79 124
  Including 207.25 207.75 0.50 3.49    
    234.00 239.50 5.50 1.13 4.21 141
  Including 234.00 234.50 0.50 1.07    
    238.00 240.50 2.50 1.09 1.77 143
  Including 238.50 239.00 0.50 2.28    
  and 239.00 239.50 0.50 2.74    
PSP-26-014   97.30 97.85 0.55 1.30 0.48 75
    99.00 103.00 4.00 1.01 3.46 78
  Including 100.00 100.65 0.65 1.33    
  and 101.50 103.00 1.50 1.87    
    108.80 111.45 2.65 1.34 1.90 85
  Including 108.80 109.30 0.50 3.55    
  and 110.80 111.45 0.65 2.31    
    115.00 116.00 1.00 1.24 0.50 90
    205.00 206.00 1.00 3.39 0.71 162
  Including 205.00 205.50 0.50 6.51    
    230.50 234.50 4.00 2.79 2.95 184
  Including 233.10 234.00 0.90 11.55    
    258.65 261.50 2.85 1.20 1.63 205
  Including 260.00 261.50 1.50 2.16    
    603.00 603.50 0.50 1.74 0.35 415
               

TABLE 2: Surface DD collar locations, orientations, and max depths.

Drillhole ID Easting
(UTM Zn 10N)		 Northing
(UTM Zn 10N)		 Elevation (m) Depth (m) Collar Dip Collar Azimuth
PSP-26-001 601525 5876998 1719 603.70 -45 125
PSP-26-002 601796 5876670 1755 502.20 -45 125
PSP-26-003 601585 5876904 1721 612.00 -45 125
PSP-26-004 601881 5876622 1750 498.00 -45 125
PSP-26-005 601563 5876859 1721 657.00 -45 125
PSP-26-006 601282 5876968 1675 542.00 -45 125
PSP-26-007 601968 5876571 1737 345.00 -45 125
PSP-26-008 602061 5876515 1717 277.75 -45 125
PSP-26-009 601436 5876996 1699 525.00 -45 125
PSP-26-010 601931 5876700 1735 74.50 -45 125
PSP-26-011 602056 5876519 1718 620.80 -45 125
PSP-26-012 601629 5876769 1728 36.00 -45 125
PSP-26-013 601932 5876700 1735 435.00 -45 125
PSP-26-014 601627 5876769 1728 734.30 -45 125
             

ABOUT THE PROSERPINE PROSPECT

The Proserpine Mountain ("Proserpine") prospect area represents a roughly 4 km long post-mineralization fault-bound prospective strike length identified through detailed surface mapping and surface geochemical sampling approximately 7 km along strike to the southeast of the Company’s permitted, 100%-owned Cariboo Gold Project, located in central British Columbia. Mineralization style and controls observed at Proserpine appear to be similar to those observed in the Cariboo Gold deposit area, with high-grade gold intercepts associated with quartz-pyrite to polymetallic (pyrite+/-galena+/-arsenopyrite) quartz veins. Less than half the strike-length of the Proserpine has been drill tested to date, with the current campaign focused on following up on promising preliminary results from the 2019-2020 drilling campaigns at the central southeast limits of the prospect area (Proserpine Southeast). An aggregate total of 10,497 metres of exploration drilling was completed by the Company at the Proserpine regional prospect between 2018 and 2020, not including new drilling contained herein.

ABOUT THE 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 an area that extends approximately 77-kilometres from 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. Mineral resources that are not mineral reserves do not have demonstrated economic viability. The reader is cautioned that inferred mineral resources have a greater degree of uncertainty than indicated mineral resources and must not be converted to mineral reserves; it is reasonably expected, though not guaranteed, that the majority of inferred mineral resources could be upgraded to indicated mineral resources with continued exploration.

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" dated June 11, 2025 (with an effective date of April 25, 2025) (the "Cariboo Technical Report").

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 ("NI 43-101") and is available electronically on SEDAR+ (www.sedarplus.ca) and on EDGAR (www.sec.gov) under Osisko Gold's issuer profile and on the Company's website at www.osiskogold.ca.

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 Gold, 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 procedures.

The exploration results disclosed in this news release are based on incomplete data and are preliminary in nature. There are no known drilling, sampling, recovery, or other factors that could materially affect the accuracy or reliability of the data; however, readers are cautioned that additional drilling and sampling may result in materially different results than those presented herein.

Quality Assurance (QA) – Quality Control (QC)

HQ and NQ diameter drill core is cut (halved) on site at the Cariboo Project subsequent to 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, labelled, sealed with numbered security tags, and transported to the laboratory under secure chain of custody procedures.

All 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 by fire-assay with gravimetric finish (upper limit 10,000 ppm). Select samples containing visible gold and/or cosalite are flagged during logging for an additional 1,000-gram screen metallic fire assay to ensure accurate quantification of any coarse fraction. All 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 GOLD GROUP INC.

Osisko Gold Group Inc. 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 Gold 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.

For further information, visit our website at www.osiskogold.ca or contact:
  
 
Sean Roosen
Chairman and CEO
Email: sroosen@osiskogold.ca
Tel: +1 (514) 940-0685
Philip Rabenok
Vice President, Investor Relations
Email: prabenok@osiskogold.ca
Tel: +1 (437) 423-3644

  
       

CAUTION REGARDING FORWARD-LOOKING STATEMENTS

This news release contains "forward-looking information" (within the meaning of applicable Canadian securities laws) and "forward-looking statements" (within the meaning of the U.S. Private Securities Litigation Reform Act of 1995, as amended) (collectively, "forward-looking statements"). Such forward-looking statements are identified with words such as "may", "will", "would", "could", "anticipate", "believe", "expect", "plan", "intend", "potential", "estimate", "propose", "project", "outlook", "foresee", "objective", "strategy", variants of these words or the negative or comparable terminology, as well as terms usually used in the future and the conditional. Information contained in forward-looking statements is based upon certain material assumptions that were applied in drawing a conclusion or making a forecast or projection, including the assumptions, qualifications, limitations or statements pertaining to: the utility and significance of the exploration drilling at the Proserpine regional target and the results and interpretation thereof; the presence and continuity of an emerging gold mineralized system at Proserpine exhibiting similarities to the Cariboo Gold deposit; the potential for open pit mining methods at Proserpine based on mineralization characteristics observed to date; the significance and interpretation of drill intercepts and the ability to expand the mineralized footprint at Proserpine; the planned resumption and continuation of the drilling program at Proserpine; the prospectivity of exploration in targets outside of currently defined mineral reserves and/or mineral resources; the assumption that a comparison of the strike length and width of the currently defined Cariboo Gold deposit to the area tested to date at the Proserpine exploration target is meaningful and indicative of exploration potential, which has not been demonstrated; the assumption that further exploration at Proserpine will yield results (if any) comparable to those at the Cariboo Gold deposit; the interpretation and accuracy of spatial geometries, geological structure and local variability modeling and assumptions; the results (if any) of further exploration work and ability of the Company to define mineral resources at Proserpine; the ability of exploration work (including drilling and sampling) to accurately predict mineralization; the ability of the Company to complete its exploration objectives in the timing contemplated and within expected costs (if at all); assumptions, qualifications and parameters underlying the Cariboo Technical Report (including, but not limited to, the mineral resources, mineral reserves, production profile, mine design and project economics); the ability of the Company to achieve the estimates outlined in the Cariboo Technical Report in the timing contemplated (if at all); the future development and operations at the Cariboo Gold Project; management's perceptions of historical trends, current conditions and expected future developments; the utility and significance of historic data, including the significance of the district hosting past producing mines; the ability to adapt to changes in gold prices, estimates of costs, estimates of planned exploration and development expenditures; the Company's strategy and objectives relating to the Cariboo Gold Project as well as its other projects; the assumptions, qualifications and limitations relating to the Cariboo Gold Project being permitted; the exploration potential and prospectivity (if any) of its properties; the Company's anticipated name change and trading of its securities under its updated stock ticker symbols (including timing thereof); regulatory framework remaining defined and understood as well as other considerations that are believed to be appropriate in the circumstances, and any other information herein that is not a historical fact may be "forward looking information". Actual results could differ materially due to a number of factors, including, without limitation: the change in the Company's trading symbols and the marketplace effective date of such changes, risks relating to third-party approvals, including the issuance of permits by governments, capital market conditions and the Company's ability to access capital on terms acceptable to the Company for the contemplated exploration and development at the Company's properties; risks related to the exploration, development and operation of the Cariboo Gold Project; risks related to geological modeling and resource estimation; health, safety and security incidents; regulatory delays or changes in regulatory framework and applicable laws; labour shortages or disputes; general economic and market conditions and business conditions in the mining industry; fluctuations in commodity and currency exchange rates; changes in regulatory framework and applicable laws, as well as those risks and factors disclosed in the Company's most recent annual information form, financial statements and management's discussion and analysis as well as other public filings on SEDAR+ (www.sedarplus.ca) and on EDGAR (www.sec.gov).

Although the Company believes the expectations conveyed by the forward-looking statements are reasonable based on information available as of the date hereof, no assurances can be given as to future results, levels of activity and achievements. The Company disclaims any obligation to update any forward-looking statements, whether as a result of new information, future events or results or otherwise, except as required by law. Forward-looking statements are not guarantees of performance and there can be no assurance that these forward-looking statements will prove to be accurate, as actual results and future events could differ materially from those anticipated in such statements. Accordingly, readers should not place undue reliance on forward-looking statements.

Neither the TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this news release. No stock exchange, securities commission or other regulatory authority has approved or disapproved the information contained herein.

Photos accompanying this announcement are available at:
https://www.globenewswire.com/NewsRoom/AttachmentNg/b721d582-4327-45f9-99b0-7912b2781c4a
https://www.globenewswire.com/NewsRoom/AttachmentNg/e0bd2556-1581-43c4-9697-f627ac4a198c
https://www.globenewswire.com/NewsRoom/AttachmentNg/703af41e-b822-4f85-82b7-53a6e1821143
https://www.globenewswire.com/NewsRoom/AttachmentNg/85a67a99-e19d-4052-9c59-366164458ce5

Source: View Original Filing on SEC EDGAR

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