Core Viewpoint - Osisko Development Corp. successfully closed a private placement of 99,065,330 units at a price of US$2.05 per unit, raising approximately US$203 million to fund the Cariboo Gold Project and for general corporate purposes [1][5]. Offering Details - The offering consists of a brokered private placement of 58,560,000 units for approximately US$120 million and a non-brokered private placement of 40,505,330 units for approximately US$83 million [2]. - Double Zero Capital LP subscribed for approximately US$75 million in the non-brokered offering, representing about 15.4% of the issued and outstanding common shares post-offering [2]. Management Commentary - The Chairman and CEO expressed satisfaction with the offering's completion and highlighted it as a strong endorsement of the Cariboo Gold Project, following a previous US$450 million project financing [3]. Use of Proceeds - The net proceeds from the offering will be used to fund the equity portion of the capital required for the Cariboo Gold Project and for general corporate purposes [5]. Underwriters and Fees - The brokered offering was led by BMO Capital Markets and RBC Capital Markets, with a cash commission of 4.5% paid to the underwriters [6]. Insider Participation - Certain insiders subscribed for 628,000 units, generating gross proceeds of US$1,287,400, which is considered a related party transaction [9]. Double Zero's Investment - Double Zero acquired 36,600,000 common shares and 18,300,000 warrants, representing approximately 16.0% of the issued common shares on a non-diluted basis [10]. - An investor rights agreement was established, granting Double Zero the right to nominate one director and other customary rights [13].

Core Insights - Osisko Development Corp. reported its financial and operational results for Q2 2025, highlighting significant developments in its Cariboo Gold Project and other projects [1][2]. Financial Performance - The company had approximately CAD 46.3 million in cash and cash equivalents as of June 30, 2025 [6]. - Revenues for Q2 2025 were CAD 6.9 million, compared to CAD 2.6 million in Q2 2024, with a cost of sales of CAD 4.1 million [6]. Cariboo Gold Project - The 2025 Feasibility Study (FS) for the Cariboo Gold Project indicates a net present value (NPV) of CAD 943 million at a gold price of USD 2,400 per ounce, with an internal rate of return (IRR) of 22.1% [4][6]. - The project is expected to produce an average of 190,000 ounces of gold annually over a 10-year mine life, totaling 1.89 million ounces [6]. - The average all-in sustaining cost (AISC) is projected at USD 1,157 per ounce [4]. Tintic Project - The Tintic Project remains in care and maintenance, with limited activities expected to continue [8][6]. - The company is evaluating options for the next steps at the Tintic Project while focusing on the Cariboo Gold Project [6]. Strategic Developments - The company has entered into a credit agreement for a senior secured project loan credit facility totaling USD 450 million for the Cariboo Gold Project [15]. - A private placement is expected to generate approximately USD 195 million, which will support the development of the Cariboo Gold Project [16]. Upcoming Milestones - Key upcoming expenditures for the Cariboo Gold Project include CAD 3.1 million for underground development and CAD 5.9 million for Bonanza Ledge construction, both expected to be completed in Q4 2025 [11][12]. Operational Updates - A small-scale heap leach project at the Tintic Project sold 1,393 gold ounces in Q2 2025, with operations anticipated to continue into Q4 2025 [6][8]. - The company has completed a 13,000-meter infill drill program to inform resource modeling and mine planning [6]. Corporate Governance - Ms. Susan Craig was appointed as an independent director to the company's board on June 16, 2025 [6]. Technical Reports - The 2025 FS was prepared in accordance with NI 43-101 standards and outlines strong economic indicators for the Cariboo Gold Project [6][19].

Exhibit 99.1 OSISKO DEVELOPMENT CORP. . . . . . . . . . . . . . . . . . . Unaudited Condensed Interim Consolidated Financial Statements For the three and six months ended June 30, 2025 and 2024 Osisko Development Corp. Consolidated Statements of Financial Position As at June 30, 2025 and December 31 2024 (Unaudited) (Tabular amounts expressed in thousands of Canadian dollars) Going concern (Note 1) Subsequent events (Note 15) APPROVED ON BEHALF OF THE BOARD (signed) Sean Roosen, Director (signed) Charles Pa ...

Not for distribution to U.S. news wire services or dissemination in the United States. MONTREAL, July 31, 2025 (GLOBE NEWSWIRE) -- Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") announces today that it has entered into an agreement with a syndicate of underwriters led by BMO Capital Markets and RBC Capital Markets, under which the underwriters have agreed to buy, on a "bought deal" private placement basis, 58,560,000 units of the Company (the "Units"), at a price of ...

Core Viewpoint - Osisko Development Corp. has secured a US$450 million senior secured project loan credit facility from Appian Capital Advisory Limited to advance the Cariboo Gold Project in British Columbia, Canada [2][4]. Financing Details - The credit facility consists of two tranches, with an initial draw of US$100 million completed to support pre-construction activities, including a 13,000-meter infill drill campaign and repayment of an existing US$25 million term loan [3][6]. - Subsequent draws totaling US$350 million will be available based on the achievement of certain project milestones and conditions [6][7]. - The facility enhances financial flexibility and is structured to support the project's development timeline [3][4]. Project Overview - The Cariboo Gold Project is a 100%-owned asset by Osisko Development, located in a stable jurisdiction with significant mineral potential [4][10]. - The project aims to advance towards a formal investment decision and construction readiness, with a focus on becoming a major Canadian gold producer [4][13]. Strategic Partnership - Appian Capital's involvement as a cornerstone investor is seen as a strong endorsement of the Cariboo Gold Project, reflecting confidence in the management team and the project's potential [4][10]. - Appian's investment strategy aligns with the project's characteristics, including its robust mineral base and experienced management [4][10]. Credit Facility Terms - The credit facility matures on July 21, 2033, with interest rates tied to the 3-month Secured Overnight Financing Rate (SOFR) plus a margin [12]. - The facility includes provisions for repayment of existing debt and funding for ongoing project activities [12][6]. - Osisko Development will grant Appian 5,625,031 non-transferable common share purchase warrants as part of the agreement [12].

Core Insights - Osisko Development Corp. announced positive results from an ore sorting testing program at its Cariboo Gold Project, indicating gold recoveries and upgrade ratios consistent with the 2025 feasibility study (FS) assumptions [2][5][12] - The testing program utilized a significantly larger sample size compared to previous tests, with a focus on optimizing the processing flowsheet [4][5] - Notably, the previously untested 6–10 mm size fraction showed a gold recovery of 92% and a mass pull of 41%, suggesting potential for further optimization [2][5][9] Summary by Sections Highlights - The ore sorting test results align with the 2025 FS assumptions, demonstrating effective gold recovery rates across various particle sizes [2][5] - The 6–10 mm size fraction, previously unassessed, achieved a gold recovery of 92% [2][5] Testing Methodology - The testwork was conducted on a bulk sample of approximately 80 tonnes, utilizing an x-ray transmission sensor (XRT) to evaluate the material [2][5][9] - The program aimed to optimize ore sorting parameters and validate the processing flowsheet [4][5] Results Overview - The 10–30 mm size fraction achieved a gold recovery of 89% with a mass pull of 45%, while the 30–70 mm size fraction achieved 84% recovery with a mass pull of 58% [2][5] - The 6–10 mm size fraction demonstrated a 92% gold recovery with a 41% mass pull, indicating a significant opportunity for optimization [2][5][9] Project Background - The Cariboo Gold Project is a permitted, 100%-owned feasibility-stage project located in central British Columbia, covering approximately 186,740 hectares [11][12] - The project hosts probable mineral reserves of 2.07 million ounces of gold and has received necessary permits for development [11][12] Next Steps - The company plans to conduct further optimization work, including a variability study to refine sorting assumptions across the deposit [5][9]

Core Insights - Osisko Development Corp. announced positive results from an ore sorting testing program at its Cariboo Gold Project, confirming gold recoveries and upgrade ratios consistent with the 2025 feasibility study (FS) assumptions [2][5][12] Summary by Sections Ore Sorting Test Results - The ore sorting testwork demonstrated gold recoveries of 84-95% across various particle sizes, with a mass pull of 41-58% and upgrade ratios ranging from 1.96 to 2.23, aligning with the 2025 FS assumptions [2][5][6] - Notably, the previously untested 6-10 mm size fraction showed a 95% gold recovery with a 41% mass pull, indicating potential for future optimization [5][11] Methodology and Observations - The test utilized a production-scale TOMRA COM 1200 Tertiary XRT machine on a ~80 tonne sample, significantly larger than previous tests which totaled ~5 tonnes [2][5][11] - The testing process involved a cascade-style approach, adjusting sorter settings to optimize mass pull and recovery, leveraging recent advancements in AI technology [11][12] Project Overview - The Cariboo Gold Project is a permitted, 100%-owned feasibility-stage project located in central British Columbia, covering approximately 186,740 hectares with significant mineral reserves and resources [12][13] - The project hosts probable mineral reserves of 2.07 million ounces of gold and various measured, indicated, and inferred resources totaling over 10 million ounces [13] Next Steps and Opportunities - The company plans to conduct further flowsheet optimization and a variability study as part of detailed engineering to refine sorting assumptions across the deposit [5][11] - The positive results from the ore sorting tests may lead to enhanced overall recoveries and improved project economics [5][11]

VIDEO - CEO Clips: Osisko Development: Advancing a Fully Permitted Gold Project in British ColumbiaJuly 04, 2025 12:30 PM EDT | Source: CEO ClipsVancouver, British Columbia--(Newsfile Corp. - July 4, 2025) - Osisko Development (TSXV: ODV) (NYSE: ODV) – Osisko is advancing one of Canada's only fully permitted gold development projects. With a recently updated feasibility study indicating strong economic returns at current gold prices, the company is preparing for construction and long-term prod ...

Cariboo Gold Project Highlights - Cariboo Gold Project has probable reserves of 2071 koz Au (17815 kt grading 362 g/t Au)[25, 44] - Cariboo Gold Project has measured resources of 8 koz Au (47 kt grading 506 g/t Au), indicated resources of 1604 koz Au (17332 kt grading 288 g/t Au), and inferred resources of 1864 koz Au (18774 kt grading 309 g/t Au)[25, 44] - The optimized feasibility study envisions a 10-year mine life with a base case after-tax NPV5% of $943 million and IRR of 221%[45] - The Cariboo Gold Project is expected to produce an average of 190 koz of gold per year over the life of mine, with 202 koz per year in the first 5 years[47] - The all-in sustaining cost (AISC) for the Cariboo Gold Project is estimated at US$1157/oz, and total cash cost is US$947/oz[47] - The initial capital expenditure for the Cariboo Gold Project is estimated at $881 million[47] Tintic Project Highlights - Tintic Project's Trixie deposit has measured resources of 105 koz Au (120 kt grading 2736 g/t Au) and 238 koz Ag (120 kt grading 6173 g/t Ag)[24, 139] - Tintic Project's Trixie deposit has indicated resources of 45 koz Au (125 kt grading 1117 g/t Au) and 240 koz Ag (125 kt grading 5989 g/t Ag)[24, 139] - Tintic Project's Trixie deposit has inferred resources of 51 koz Au (202 kt grading 780 g/t Au) and 315 koz Ag (202 kt grading 4855 g/t Ag)[24, 139] Capital Structure - Osisko Development Corp has a basic market capitalization of C$4178 million, with C$776 million in cash and cash equivalents[30]

Company Overview - Osisko Development Corp. is a North American gold development company focused on past-producing mining camps in mining-friendly jurisdictions with district-scale potential [5] - The company's objective is to become an intermediate gold producer by advancing its flagship Cariboo Gold Project in central British Columbia, Canada [5] - The project pipeline includes the Tintic Project in Utah, U.S.A., and the San Antonio Gold Project in Sonora, Mexico, both of which have significant exploration potential and access to existing infrastructure [5] Appointment of New Director - Ms. Susan Craig has been appointed as an independent director to the board of Osisko Development effective immediately [1] - Her experience includes over 35 years in the mining industry, focusing on regulatory, environmental, social, Indigenous, and community relations [2][4] - Craig's leadership in navigating high-profile projects through regulatory frameworks aligns with the company's values and strategic direction [2] Experience and Contributions - Ms. Craig has played a pivotal role in advancing projects through complex environmental assessment processes, including the 2004 EA process for NovaGold's Galore Creek project [3] - She has established landmark agreements with Indigenous nations and has been involved in socio-economic accords in Canada [3] - Craig has held senior leadership roles and has served on various boards, including the Yukon Energy Corporation and the Mining Association of BC [4] Recognition and Awards - Ms. Craig has received multiple industry awards for her leadership in sustainable development, including the 2017 Canadian Women in Mining Trailblazer Award [4] - She is recognized as a longstanding advocate for responsible mining practices [4]