Announcement • Aug 07

Osisko Development Corp. Provides Exploration Update At Tintic Project

Osisko Development Corp. provided an update on exploration activities at its 100%-owned Tintic Project located in the historic East Tintic Mining District in central Utah, U.S.A. This includes results of recently completed surface and underground diamond drilling targeting potential copper-gold-molybdenum porphyry centers, underground chip sampling at the Trixie test mine ("Trixie"), and ongoing target generation work. BIG HILL PORPHYRY TARGET DRILLING Drilling Results. Two surface diamond drill holes, BH-DD-24-001 and BH-DD-24-002, have been completed at the Big Hill target Area in early May 2024. The first drill hole was completed to a depth of 1,297 meters ("m") (4,257 feet ("ft")) when it transitioned out of the prospective alteration zone. The second drill hole was repositioned at a modified angle and completed to a depth of 1,623 m (5,324 ft). Both drill holes intersected porphyry systems defined by at least three late-mineral monzonite porphyritic intrusive phases and an intrusion breccia over a vertical depth of approximately 1,500 m. Although anomalous copper and molybdenum mineralization was encountered, including low visible presence of chalcopyrite, tennantite, and molybdenite, this was primarily localized along structures, and hydrothermal breccias, and the transition from calcareous rocks into quartzites. No significant intercepts of copper, gold or molybdenum were observed. The porphyries encountered to date are considered to lack evidence for the major fluid paths required to be the source of mineralization in the Tintic District. Results to date have shown that the porphyries and intrusion breccia display potassic alteration with anhydrite and pyrite veinlets, which have undergone variable retrograde alteration to illite-chlorite and have been overprinted by pyrophyllite, dickite, and kaolinite along fault zones. This combination of intrusive rocks and alteration are clear evidence of the presence of a porphyry style mineralization at Big Hill. However, they are weakly mineralized, late inter-mineral phases that often post-date the better mineralized early-porphyry intrusive phases in well known porphyry deposits. Big Hill West Target. The results of the recent and historical drill holes suggest that the early and potentially better mineralized intrusive phase could be in an untested area immediately west and southwest of the area drilled at Big Hill . Early porphyry intrusions, with more intense veinlets and alteration, are thought to be required to explain the metal inventory of the Tintic District. Drill core to date has shown that carbonate rocks in the intrusion breccia are marbleized and, in places, altered to retrograde skarn. Some discrete intervals comprise a finer-grained monzonite porphyry which is cut by porphyry-style quartz and magnetite veinlets, some containing pyrite and molybdenite with clear B-type affinity. HIGH-POTENTIAL PORPHYRY AND CRD TARGETS The Zuma Target The Zuma area is considered a good porphyry target that merits initial drill testing and may represent one of the causative porphyry centres of the East Tintic district . It is defined by overlapping geochemical and geophysical anomalies: the confluence of several regional scale structures linked to known high-sulfidation mineralization, the presence of early quartz veinlets on surface, and indications of multiple phases of magmatism. Drill testing of the anomalies identified at Zuma is considered a high-priority porphyry target. Lower Quartzite CRD Target Based on the compilation of geological, drilling, and historical data, a potential large scale carbonate replacement deposit ("CRD") may be located below the footwall of the East Tintic thrust fault. A recommended drill target follows downdip extensions of known mineralization at Burgin, along the traces of the NE faults below where they intersect the west dipping thrust fault that defines the base of the quartzite. Of note, historic production and most known metal inventory in the Burgin area represents close to 45% of the total mineralization discovered and mined in the East Tintic district. Meaning, these ore deposits are typically larger than those in veins and narrow mantos at the top of the quartzite. CRD mineralization mined in the East Tintic district, except for the Burgin deposit, has all been localized at the upper contact or close to the upper contact of the Tintic Quartzite and the calcareous strata of the Ophir formation, structurally confined along the intersection of NE trending faults. It also includes an approximate location of known main ore bodies, potential location of the proposed causative porphyry center of Zuma (drill target) and a potential connection of proximal Cu-Au CRD-Skarn mineralization below the thrust fault-plain starting at the limits of the causative porphyry and changing toward the east into Zn-Pb-Ag-Mn distal mineralization at Burgin. The proposed CRD drill hole is located between Burgin and Trixie. TRIXIE UNDERGROUND CHIP SAMPLE ASSAY HIGHLIGHTS Chip samples were collected from new development areas in the walls of an exploration crosscut to explore along the Wild Cat, T2 and T4 domains of the Trixie deposit on the 625 Level. Assay highlights include underground chip samples from four new development faces. All four faces had samples with greater than 1.0 gram per tonne ("g/t") gold ("Au") or greater than 50.0 g/t silver ("Ag") values. The remaining chip samples returned no significant assays. Selected assay highlights include: 11.07 g/t Au and 25.45 g/t Ag over 6.10 m in CH01716 (0.32 ounce per ton ("oz/t") Au and 0.74 oz/t Ag over 20 ft) including 90.20 g/t Au and 226.33 g/t Ag over 0.30 m (2.63 oz/t Au and 6.60 oz/t Ag over 1 ft) 9.13 g/t Au and 28.69 g/t Ag over 6.71 m in CH01717 (0.27 oz/t Au and 0.84 oz/t Ag over 22 ft) including 21.77 g/t Au and 52.31 g/t Ag over 1.52 m (0.63 oz/t Au and 1.53 oz/t Ag over 5 ft).

Announcement • May 18

Osisko Development Corp. Reports Exploration Results at Trixie and Outlines 2023 Drill Program at Tintic Project

Osisko Development Corp. announced new 2023 underground diamond drilling ("DD") results at its 100%-owned Trixie test mine ("Trixie"), within the Company's wider Tintic Project ("Tintic" or the "Tintic Project") and to provide an overview of the ongoing 2023 exploration program at Tintic, located in the historic East Tintic Mining District in central Utah, U.S.A. In addition, the Company is also reporting the remaining DD and reverse circulation drilling ("RC") results from its 2022 exploration program. DRILL ASSAY HIGHLIGHTS: This news release includes assays from 22 DD holes and 20 RC holes. Select assay highlights include: 23.49 grams per tonne ("g/t") gold ("Au") and 58.79 g/t silver ("Ag") over 1.37 meters ("m") in hole TUG-625-106 (0.69 troy oz per short ton ("oz/t") Au and 1.71 oz/t Ag over 4.50 feet ("ft.") - 19.54 g/t Au and 58.54 g/t Ag over 1.98 m in hole TRXU-DD-23-001 (0.57 oz/t Au and 1.71 oz/t Ag over 6.5 ft.) - 43.44 g/t Au and 40.63 g/t Ag over 0.91 m in hole TRXU-DD-23-003 (1.27 oz/t Au and 1.19 oz/t Ag over 3.00 ft.) - 62.82 g/t Au and 231.46 g/t Ag over 6.86 m in hole TRXU-DD-23-003 (1.83 oz/t Au and 6.75 oz/t Ag over 22.5 ft.) including .00 g/t Au and 707.00 g/t Ag over 1.07 m (5.57 oz/t Au and 20.62 oz/t Ag over 3.50 ft.) and 117.00 g/t Au and 393.00 g/t Ag over 1.68 m (3.41 oz/t Au and 11.46 oz/t Ag over 5.50 ft.) - 49.11 g/t Au and 255.00 g/t Ag over 1.07 m in hole TRXU-DD-23-003 (1.43 oz/t Au and 7.44 oz/t Ag over 3.5 ft.) - 7.95 g/t Au and 26.12 g/t Ag over 7.32 m in hole TRXU-DD-23-005 (0.23 oz/t Au and 0.76 oz/t Ag over 24.00 ft.) - 10.67 g/t Au and 38.51 g/t Ag over 4.27 m in hole TRXU-DD-23-005 (0.31 oz/t Au and 1.12 oz/t Ag over 14.00 ft.) - 28.70 g/t Au and 98.15 g/t Ag over 1.52 m in hole TRXU-DD-23-016 (0.84 oz/t Au and 2.86 oz/t Ag over 5.00 ft.) - 7.67 g/t Au and 13.43 g/t Ag over 11.58 m in hole TRXU-DD-23-018 (0.22 oz/t Au and 0.39 oz/t Ag over 38.00 ft.) including 35.07 g/t Au and 19.47 g/t Ag over 1.07 m (1.02 oz/t Au and 0.57 oz/t Ag over 3.50 ft.) - 20.30 g/t Au and 155.00 g/t Ag over 1.52 m in hole TRC121 (0.59 oz/t Au and 4.52 oz/t Ag over 5.00 ft). DRILL RESULTS SUMMARY: In 2022, the Company completed 28 surface RC drill holes near Trixie totaling approximately 8,753 m (28,718 ft.) and 66 underground DD holes in the 625 level at Trixie totaling approximately 2,985 m (9,796 ft.). Assays have now been received for all 2022 holes. The high-grade intercepts disclosed in this news release were targeting all domains of the current Trixie mineral resource estimate. The T1 domain consists of Tintic quartzite-hosted mineralization constrained within the footwall of the T2 and between the T2 and 75-85 structures. The Mineralization observed is both disseminated and in a series of discrete high-grade fissure veins. Hole TRXU-DD-23-003 intersected 62.82 g/t Au and 231.46 g/t Ag over 6.86 m including higher grade samples of 191.00 g/t Au and 707.00 g/t Ag over 1.07 m and 117.00 g/t Au and 393.00 g/t Ag over 1.68 m. Hole TRXU-DD-23-005 intersected 7.95 g/t Au and 26.12 g/t Ag over 7.32 m in the T4 stockwork and fissure veins and further downhole intersected 10.67 g/t Au and 38.51 g/t Ag over 4.27 m in the 75-85 polymetallic vein. These drilling results will provide valuable infill data to improve understanding and the confidence level of the mineralized zones defined in the Trixie MRE and to support a future mineral resource update. The RC drilling was initially designed to explore 600 m to the northeast of Trixie. Subsequent RC holes were planned along strike to test north of the T2 zone, and further to the south to explore for mineralized structures to be followed up with underground core drilling. Several of the exploration holes intersected anomalous precious metal values including 0.21 g/t Au and 142.0 g/t Ag over 1.52 m and 0.27 g/t Au and 40.53 g/t Ag over 16.76 meters in hole TRC053A, drilled 250 m north of T2, and potentially showing mineralized systems along strike. Hole TRC121 intersected 20.3 g/t Au and 155.0 g/t Ag over 1.52 m within the T4 zone. 2023 EXPLORATION DRILLING PROGRAM: The 2023 exploration program consists of an initial 5,000 m (16,400 ft.) of underground exploration and delineation drilling of the current Trixie MRE. Additional drilling is also proposed to determine the extents of the known mineralization. To date, the Company has completed 35 DD holes totaling approximately 3,226 m (10,584 ft.). The drilling is targeting all known mineralized domains and extending into the footwall to the west to test for parallel mineralized zones. Assay results have been received for 19 DD holes, as disclosed herein. Results for the remaining holes are pending. Currently there are two underground diamond drill rigs in operation at Trixie conducting exploration activities. Approximately 75% of the 1,390 m (4,550 ft.) of the Trixie portal and underground decline ramp has been completed to date. The Company anticipates completion of the decline ramp to the main 625 level by Third Quarter 2023, which is expected to significantly improve underground access for exploration drilling. During 2022, the exploration team completed an extensive review and compilation of historical data on the Tintic Project. 3D models of historical mine development, drilling, geochemical and lithological data were integrated and, as a result, a number of high sulphidation epithermal Au-Ag targets were identified at North Lily and Eureka Standard. Copper-molybdenum-gold porphyry targets were identified at Big Hill with the integration of historical drilling, surface geochemistry, geophysics and alteration mineralogy that defined a lithocap approximately 2 km in strike length and 1 km wide indicative of a potential porphyry. A strong geophysical and geochemical target was also identified to the West and depth below Trixie. An initial program of surface diamond drilling is planned to test the Big Hill porphyry target and is anticipated to commence in Third Quarter 2023. Drilling is also recommended for the Eureka Standard and North Lily targets and will be a part of the Company’s ongoing exploration efforts. A 3D model of the compilation and targets at Tintic is available by accessing the Company’s VRIFY page at: https://vrify.com/decks/12801. The Tintic Project exploration presentation on the Company’s website provides a high-level overview of each target.

Total Shareholder Yield	-54.4%
Future Dividend Yield	0%
Dividend Growth	n/a
Next dividend pay date	n/a
Ex dividend date	n/a
Dividend per share	n/a
Payout ratio	n/a

Segment	Dividend Yield
Company (ODV)	n/a
Market Bottom 25% (US)	1.4%
Market Top 25% (US)	4.3%
Industry Average (Metals and Mining)	1.5%
Analyst forecast (ODV) (up to 3 years)	0%

Data	Last Updated (UTC time)
Company Analysis	2026/06/21 10:41
End of Day Share Price	2026/06/18 00:00
Earnings	2026/03/31
Annual Earnings	2025/12/31

Package	Data	Timeframe	Example US Source ^*
Company Financials	10 years	Income statement Cash flow statement Balance sheet	SEC Form 10-K SEC Form 10-Q
Analyst Consensus Estimates	+3 years	Forecast financials Analyst price targets	Analyst Research Reports Blue Matrix
Market Prices	30 years	Stock prices Dividends, Splits and Actions	ICE Market Data SEC Form S-1
Ownership	10 years	Top shareholders Insider trading	SEC Form 4 SEC Form 13D
Management	10 years	Leadership team Board of directors	SEC Form 10-K SEC Form DEF 14A
Key Developments	10 years	Company announcements	SEC Form 8-K

Analyst	Institution
Andrew Mikitchook	BMO Capital Markets Equity Research
Matthew Murphy	BMO Capital Markets Equity Research
Kevin Mackenzie	Canaccord Genuity

Osisko Development Dividends and Buybacks

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Key information

Recent dividend and buyback updates

Recent updates

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