Contractor fatality halts Osisko Development (NYSE: ODV) Cariboo work

Rhea-AI Filing Summary

Osisko Development Corp. filed a report describing a fatal accident at its 100%-owned Cariboo Gold Project in central British Columbia. On January 22, 2026, a contractor working at surface suffered a fatal injury in what the company describes as an isolated incident. Appropriate authorities were notified promptly and an investigation is underway.

Chairman and CEO Sean Roosen expressed condolences to the worker’s family, friends and coworkers and emphasized that health, safety and wellbeing at the project are the company’s highest priority. Activities at the Cariboo Gold Project have been temporarily suspended to allow for the investigation, with the company indicating it will share further information when appropriate.

Positive

• None.

Negative

• Workplace fatality and project pause: A contractor suffered a fatal injury at the Cariboo Gold Project on January 22, 2026, and project activities have been temporarily suspended to allow for an investigation.

Insights

Mining safety and ESG risk analyst

Fatality and project suspension raise safety and operational risk concerns.

Osisko Development reports that a contractor died on January 22, 2026 in an isolated incident at the surface of the Cariboo Gold Project in British Columbia. The company states that relevant authorities were notified and that an investigation is in progress, which aligns with standard regulatory expectations in mining jurisdictions.

Project activities have been temporarily suspended to allow for the investigation. This pause may affect near-term work at the site, although the extent is not detailed. From an ESG perspective, a workplace fatality is a serious event that can draw regulatory scrutiny and may prompt internal reviews of safety practices and procedures.

The company’s leadership publicly reaffirmed that health, safety and wellbeing at the project are its highest priority and indicated that additional information will be provided in due course. Future disclosures in company communications may clarify the investigation outcome, any remedial actions at Cariboo, and potential implications for project timelines.

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 January 2026

Commission File Number: 001-41369

Osisko Development Corp.
(Translation of registrant's name into English)

1100 Avenue des Canadiens-de-Montréal, Suite 300, Montréal, Quebec H3B 2S2
(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 January 23, 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 Development Corp.
		(Registrant)
Date: January 23, 2026		/s/ Alexander Dann
		Alexander Dann
		Chief Financial Officer and VP Finance

EXHIBIT 99.1

Osisko Development Reports Contractor Fatality at the Cariboo Gold Project

MONTREAL, Jan. 23, 2026 (GLOBE NEWSWIRE) -- Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") regrets to report that on January 22, 2026, a contractor working at surface suffered a fatal injury following an isolated incident at the Cariboo Gold Project (the "Project"), located in central British Columbia ("B.C."), Canada.

The Company promptly notified appropriate authorities, and an investigation of the incident is underway.

Sean Roosen, Chairman and CEO, stated: "We are deeply saddened by this tragic accident and extend our heartfelt condolences and support to our colleague's family, friends and coworkers during this difficult time. The health, safety and wellbeing of all employees and contractors working at the Project is our highest priority."

Activities at the Project have been temporarily suspended to allow for an investigation.

The Company will provide further information in due course, as appropriate.

ABOUT OSISKO DEVELOPMENT CORP.

Osisko Development Corp. is a continental North American gold development company focused on past-producing mining camps located in mining friendly jurisdictions with district scale potential. The Company's objective is to become an intermediate gold producer by advancing its flagship permitted 100%-owned Cariboo Gold Project, located in central B.C., Canada. Its project pipeline is complemented by the Tintic Project in the historic East Tintic mining district in Utah, U.S.A.—brownfield properties with significant exploration potential, extensive historical mining data, access to existing infrastructure and skilled labour. The Company's strategy is to develop attractive, long-life, socially and environmentally responsible mining assets, while minimizing exposure to development risk and growing mineral resources.

For further information, visit our website at www.osiskodev.com or contact:

Sean Roosen	Philip Rabenok
Chairman and CEO	Vice President, Investor Relations
Email:sroosen@osiskodev.com	Email:prabenok@osiskodev.com
Tel: +1 (514) 940-0685	Tel: +1 (437) 423-3644

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.

FAQ

What incident did Osisko Development Corp. (ODV) report at the Cariboo Gold Project?

Osisko Development reported that on January 22, 2026, a contractor working at surface at the Cariboo Gold Project in central British Columbia suffered a fatal injury in an isolated incident.

How has Osisko Development (ODV) responded operationally to the contractor fatality?

Activities at the Cariboo Gold Project have been temporarily suspended to allow for an investigation into the fatal incident.

Which authorities were involved after the Osisko Development (ODV) incident?

Osisko Development stated that it promptly notified appropriate authorities following the contractor’s fatal injury, and an investigation is underway.

What did Osisko Development’s CEO say about the Cariboo Gold Project accident?

Chairman and CEO Sean Roosen expressed deep sadness, offered condolences to the contractor’s family, friends and coworkers, and emphasized that health, safety and wellbeing at the project are the company’s highest priority.

Will Osisko Development (ODV) provide more details on the Cariboo Gold incident?

The company said it will provide further information in due course, as appropriate, once the investigation into the incident progresses.

What is Osisko Development Corp.’s main business focus?

Osisko Development is a North American gold development company aiming to become an intermediate gold producer by advancing its flagship Cariboo Gold Project in central British Columbia, complemented by the Tintic Project in Utah.