Southern Expansion Hole Hits 46 Metres Averaging 1.10% Cu

Osisko Metals Incorporated (TSX: OM) (OTCQX: OMZNF) (FRANKFURT: 0B51) is pleased to announce new drill results from the Gaspé Copper Project, located in the Gaspé Peninsula of Eastern Québec.

Osisko Metals CEO Robert Wares commented: “These latest results continue to confirm and expand our resource model with several long continuous intersections of copper and molybdenum mineralization in the core of the deposit. The new drilling keeps deepening the deposit and again confirms its southern extension with holes 30-1119 and 30-1124. We are excited about the growth of our project, especially within the context of a fundamental rising metal market where copper spot price is rapidly approaching US$5/lb, silver is at US$47/oz and molybdenum is holding steady at over US$30/lb.”

New analytical results are presented below (see Table 1), including 33 mineralized intercepts from nine new drill holes. Infill intercepts are located inside the 2024 MRE model (see November 14, 2024 news release), and are focused on upgrading inferred mineral resources to measured or indicated categories, as applicable. Expansion intercepts are located outside the 2024 MRE model and may potentially lead to additional resources that will be classified appropriately within the next MRE update. Some of the reported intercepts have contiguous shallower infill as well as deeper expansion (noted on Table 1 below as “Both”). Maps showing hole locations are available at www.osiskometals.com.

Highlights:

• Drill hole 30-1107
  • 592.0 metres averaging 0.33% Cu (0.46 CuEq) (infill and expansion)
• Drill hole 30-1112
  • 868.5 metres averaging 0.23% Cu (0.30 CuEq) (infill and expansion)
• Drill hole 30-1114
  • 142.1 metres averaging 0.39% Cu (0.47 CuEq) (expansion)
• Drill hole 30-1116
  • 565.5 metres averaging 0.22% Cu (0.29 CuEq) (infill and expansion)
• Drill hole 30-1119
  • 46.4 metres averaging 1.10% Cu (1.25 CuEq) (expansion)
• Drill hole 30-1122
  • 760.5 metres averaging 0.24% Cu (0.30 CuEq) (infill and expansion)
• Drill hole 30-1124
  • 200.5 metres averaging 0.32% Cu (0.37 CuEq) (expansion)
  • 203.2 metres averaging 0.37% Cu (0.39 CuEq) (expansion)

Table 1: Infill and Expansion Drilling Results

* See explanatory notes below on copper equivalent values and Quality Assurance/Quality Controls.
** “Both” indicates drill holes that have contiguous shallower infill as well as deeper expansion intercepts.

Discussion

Drill hole 30-1107, located on top of Copper Mountain near the center of the 2024 MRE model, cut three mineralized intervals including 592.0 metres averaging 0.33 % Cu, 1.68 g/t Ag and 0.032% Mo (which includes 336.6 metres of depth expansion), extending mineralization in this area to a vertical depth of 1003 metres.

Drill hole 30-1112, located on the western flank of Copper Mountain, cut two mineralized intervals including 868.5 metres averaging 0.23 % Cu, 1.45 g/t Ag and 0.019% Mo (which includes 417.0 metres of depth expansion), extending mineralization in this area to a vertical depth of 1119 metres.

Drill hole 30-1113, located on the western margin of the 2024 MRE model, cut multiple intersections of mineralization, 26 to 42 metres thick and distributed in “layer cake” fashion from surface to a vertical depth of 769 metres, confirming the current limit of the 2024 MRE model at this location.

Drill hole 30-1114, located near the eastern margin of the 2024 MRE model, cut multiple intersections of mineralization distributed in “layer cake” fashion from surface to a vertical depth of 950 metres, including 142.1 metres averaging 0.39 % Cu, 1.50 g/t Ag and 0.019% Mo (expansion).

Drill hole 30-1116, located on top of Copper Mountain near the center of the 2024 MRE model, cut six mineralized intervals including 565.5 metres averaging 0.22 % Cu, 1.86 g/t Ag and 0.017% Mo (which includes 96.3 metres of depth expansion), extending mineralization in this area to a vertical depth of 1110 metres.

Drill holes 30-1119 and 30-1124, both located immediately south of the southern margin of the 2024 MRE model, cut multiple intersections of mineralization, including 46.4 metres averaging 1.10 % Cu, 5.08 g/t Ag and 0.032% Mo near and including the E Zone skarn horizon (30-1119) and 203.2 metres averaging 0.37% Cu and 2.81 g/t Ag (30-1124). These intersections extend mineralization to a vertical depth of 619 metres within the southern expansion of the deposit, which remains open towards Needle Mountain East.

Drill hole 30-1121, located 50 metres east of the 2024 MRE model, did not intersect significant mineralization as expected, once again confirming the current eastern limit of the resource model.

Drill hole 30-1122, located on the western flank of Copper Mountain, intersected three mineralized intervals, including 760.5 metres averaging 0.24% Cu, 1.71 g/t Ag and 0.015% Mo (which includes 456.1 metres of depth expansion), extending mineralization in this area to a vertical depth of 1137 metres.

Mineralization at Gaspé Copper is of porphyry copper/skarn type and occurs as disseminations and stockworks of chalcopyrite with pyrite or pyrrhotite and minor bornite and molybdenite. One prograde and at least five retrograde vein/stockwork mineralizing events have been recognized at Copper Mountain, which overprint earlier, bedding replacement skarn and porcellanite-hosted mineralization throughout the Gaspé Copper system. Porcellanite is a historical mining term used to describe bleached, pale green to white potassic-altered hornfels. Subvertical stockwork mineralization dominates at Copper Mountain whereas prograde bedding-parallel mineralization, that is mostly stratigraphically controlled, dominates in the area of lower Copper Mountain, Needle Mountain, Needle East, and Copper Brook. High molybdenum grades (up to 0.5% Mo) were locally obtained in both the C Zone and E Zone skarns away from Copper Mountain.

The 2022 to 2024 Osisko Metals drill programs were focused on defining open-pit resources within the Copper Mountain stockwork mineralization (see May 6, 2024 MRE press release). Extending the resource model south of Copper Mountain into the poorly-drilled prograde skarn/porcellanite portion of the system subsequently led to a significantly increased resource, mostly in the Inferred category (see November 14, 2024 MRE press release).

The current drill program is designed to convert the November 2024 MRE to Measured and Indicated categories, as well as test the expansion of the system deeper into the stratigraphy and laterally to the south and southwest towards Needle East and Needle Mountain respectively. The November 2024 MRE was limited at depth to the base of the L1 skarn horizon (C Zone), and all mineralized intersections below this horizon represent potential depth extensions to the deposit, to be included in the next scheduled MRE update in Q1 2026.

All holes are being drilled sub-vertically into the altered calcareous stratigraphy which dips 20 to 25 degrees to the north. The L1 (C Zone) the L2 (E Zone) skarn/marble horizons were intersected in most holes, as well as intervening porcellanites that host the bulk of the disseminated copper mineralization.

Table 2: Drill hole locations

Explanatory note regarding copper-equivalent grades

Copper Equivalent grades are expressed for purposes of simplicity and are calculated taking into account: 1) metal grades; 2) estimated long-term prices of metals: US$4.25/lb copper, $20.00/lb molybdenum, and US$24/oz silver; 3) estimated recoveries of 92%, 70%, and 70% for Cu, Mo, and Ag respectively; and 4) net smelter return value of metals as percentage of the price, estimated at 86.5%, 90.7%, and 75.0% for Cu, Mo, and Ag respectively.

Qualified Person

The scientific and technical content of this news release has been reviewed and approved by Mr. Bernard-Olivier Martel, P. Geo. (OGQ 492), an independent “qualified person” as defined by National Instrument 43-101 – Standards of Disclosure for Mineral Projects.

Quality Assurance / Quality Control

Mineralized intervals reported herein are calculated using an average 0.12% CuEq lower cut-off over contiguous 20-metre intersections (shorter intervals as the case may be at the upper and lower limits of reported intervals). Intervals of 20 metres or less are not reported unless indicating significantly higher grades. True widths are estimated at 90 – 92% of the reported core length intervals.

Osisko Metals adheres to a strict QA/QC program for core handling, sampling, sample transportation and analyses, including insertion of blanks and standards in the sample stream. Drill core is drilled in HQ or NQ diameter and securely transported to its core processing facility on site, where it is logged, cut and sampled. Samples selected for assay are sealed and shipped to ALS Canada Ltd.’s preparation facility in Sudbury. Sample preparation details (code PREP-31DH) are available on the ALS Canada website. Pulps are analyzed at the ALS Canada Ltd. facility in North Vancouver, BC. All samples are analyzed by four acid digestion followed by both ICP-AES and ICP-MS for Cu, Mo and Ag.

About Osisko Metals

Osisko Metals Incorporated is a Canadian exploration and development company creating value in the critical metals sector, with a focus on copper and zinc. The Company acquired a 100% interest in the past-producing Gaspé Copper mine from Glencore Canada Corporation in July 2023. The Gaspé Copper mine is located near Murdochville in Québec’s Gaspé Peninsula. The Company is currently focused on resource expansion of the Gaspé Copper system, with current Indicated Mineral Resources of 824 Mt averaging 0.34% CuEq and Inferred Mineral Resources of 670 Mt averaging 0.38% CuEq (in compliance with NI 43-101). For more information, see Osisko Metals’ November 14, 2024 news release entitled “Osisko Metals Announces Significant Increase in Mineral Resource at Gaspé Copper”. Gaspé Copper hosts the largest undeveloped copper resource in eastern North America, strategically located near existing infrastructure in the mining-friendly province of Québec.

In addition to the Gaspé Copper project, the Company is working with Appian Capital Advisory LLP through the Pine Point Mining Limited joint venture to advance one of Canada’s largest past-producing zinc mining camps, the Pine Point project, located in the Northwest Territories. The current mineral resource estimate for the Pine Point project consists of Indicated Mineral Resources of 49.5 Mt averaging 5.52% ZnEq and Inferred Mineral Resources of 8.3 Mt averaging 5.64% ZnEq (in compliance with NI 43-101). For more information, see Osisko Metals’ June 25, 2024 news release entitled “Osisko Metals releases Pine Point mineral resource estimate: 49.5 million tonnes of indicated resources at 5.52% ZnEq”. The Pine Point project is located on the south shore of Great Slave Lake, NWT, close to infrastructure, with paved road access, an electrical substation and 100 kilometres of viable haul roads.