Sean Roosen

Sean Roosen is the Founder, Executive Chairman and Chief Executive Officer of Osisko Development Corp. He is also the founder and former Chairman and CEO of Osisko Gold Royalties, where he served from its inception in 2014 until 2023. Mr. Roosen has over 30 years of progressive experience in the mining industry.

As founder, President, Chief Executive Officer and Director of Osisko Mining Corporation, he was responsible for developing the strategic plan for the discovery, financing and development of the Canadian Malartic mine. He also led the efforts for the maximization of shareholders' value in the sale of Osisko Mining Corporation, which resulted in the creation of Osisko Royalties. Canadian Malartic achieved commercial production in May 2011 and remains one of Canada's largest gold-producing mines and among the largest globally.

In 2017, Mr. Roosen received an award from Mines and Money Americas for best Chief Executive Officer in North America and was, in addition, named in the "Top 20 Most Influential Individuals in Global Mining". Mr. Roosen was a founding member of Osisko Mining Corporation (2003) and of EurAsia Holding AG, a European venture capital fund. Mr. Roosen is a graduate of the Haileybury School of Mines.

Career History

• Founder, Executive Chairman and Chief Executive Officer, Osisko Development Corp. (2020–present)
• Founder and former Chairman and CEO, Osisko Gold Royalties (2014–2023)
• Founder, President, CEO and Director, Osisko Mining Corporation (2003–2014)
• Operations Manager, Etruscan Resources, Inc.
• Extensive international mining experience with Hansa Geomin, Echo Bay, and Placer Dome in West Africa

What Sean Roosen could bring to Osisko Development: Drawing on his track record of discovering and developing the Canadian Malartic mine—one of Canada's largest gold operations—and his proven ability to create shareholder value through strategic M&A and the establishment of successful royalty platforms, Roosen brings deep operational expertise, capital markets acumen, and an established network in the mining sector. His three decades of experience building and scaling mining companies positions him to advance Osisko Development's North American gold projects toward commercial viability.