Management

Brock Colterjohn, B.Sc. (Geology), MBA.

President & CEO

Mr. Colterjohn currently serves as the President and Chief Executive Officer of Onyx Gold. With over twelve years of experience in the resource sector, he possesses significant expertise in equity capital markets, mineral exploration, and production geology in Canada and Mexico. Mr. Colterjohn previously worked as a Mining Research Analyst at Cormark Securities, covering junior precious metals exploration and development companies, and as a Mining Equity Sales Specialist at Canaccord Genuity, where he raised over $2 billion for corporate mining clients. Prior to that, he worked as an exploration and production geologist at AuRico Gold and other exploration and development companies. Mr. Colterjohn holds an MBA in Global Mining Management from the Schulich School of Business and a B.Sc. in Geology from Dalhousie University.

Darwin Green, B.Sc., M.Sc., P.Geo.

Executive Chairman

Founder of Onyx Gold, and founder of the company from which Onyx was spun out, HighGold Mining, Darwin Green has over 20 years of experience in the mineral deposit industry in USA, Canada and Latin America, with vast knowledge and a successful history in Alaska. He has a proven record of identifying opportunities, making discoveries and executing complex advanced exploration. His corporate credentials include involvement in multiple public financings and corporate transactions, negotiating option and joint venture agreements, and developing business opportunities.

Prior to HighGold, Mr. Green served as Vice President, Exploration for Constantine Metal Resources advancing the Alaska Palmer zinc/copper deposit to the Preliminary Economic Assessment stage. Prior to that, Mr. Green oversaw resource expansion and underground development programs at the Niblack deposit on Prince of Wales Island, for which he received the Commissioner’s Award for Project Excellence by the State of Alaska. Mr. Green drives the strategy, oversees the exploration processes and leads the business development and corporation marketing for HighGold. Mr. Green holds both a B.Sc. and an M.Sc. in economic geology.

Ian Cunningham-Dunlop, B.Sc., P. Eng.

Executive Vice President

Ian Cunningham-Dunlop is a seasoned mining executive and professional engineer with more than 35 years’ experience in domestic/international mineral exploration and project development. His experience includes Constantine Metal Resources’ Alaska Palmer zinc/copper project, the Castle Mountain gold project in California (NewCastle Gold), the Karma gold mine in Burkina Faso (True Gold Mining), and the Long Canyon gold mine in Nevada (Fronteer Gold).

Mr. Cunningham-Dunlop also led the surface exploration team at the Eskay Creek Au-Ag-Cu-Pb-Zn mine in British Columbia, Canada (Homestake Mining/Barrick Gold) from 1997-2003 giving him a strong understanding of systems similar in style and age to HighGold’s flagship Johnson Tract deposit. He was awarded the BC & Yukon Chamber of Mines E.A. Scholz Award in October 2003 for “Outstanding Contribution to a Mining Development Project in B.C. and the Yukon”. Mr. Cunningham-Dunlop holds a B.Sc. in Geological Engineering from Queen’s University.

Conor McKinley, M.Sc., P.Geo.

Vice President, Exploration

Conor McKinley has worked on a wide variety of gold and base metal exploration projects in Canada, the United States, and Greece since 2006. Most recently, he served as Senior Geologist and Ontario Project Manager for HighGold Mining, where he was responsible for the planning and execution of exploration programs as well as associated permitting, land management, and public consultation. Previously he was Senior Project Geologist for Constantine Metal Resources on the Palmer zinc-copper project in Alaska where he oversaw drilling activities over several exploration programs. He holds a B.Sc. (Hons.) in Geological Sciences from Queen’s University and an M.Sc. in Earth Sciences from Memorial University of Newfoundland. He is a registered Professional Geoscientist in the provinces of British Columbia and Ontario.

Aris Morfopoulos, B.Comm. (Hons.)

Chief Financial Officer

Aris Morfopoulos is an executive and accountant with over 30 years’ corporate management experience. He has worked as a CFO, as senior management and as a director of several junior resource companies based in British Columbia since 1994. He has significant experience in the areas of international corporate structuring and business. In addition to his role with Onyx Gold, he has been the CFO of HighGold Mining since its inception 2019 and of HighGold’s parent company, Constantine Metal Resources prior to that.

Vanessa Pickering

Vice President, Investor Relations

Vanessa Pickering brings over 20 years of experience in the mineral exploration and mining sector, with a focus on investor relations, corporate communications, and capital markets. Her proven track record includes building investor awareness and supporting institutional ownership, alongside a deep understanding of community and First Nations engagement. Before joining Onyx, she was Manager of Investor Relations at Orezone Gold Corp., aiding its transformation into a multi-asset gold producer. Vanessa also held roles at IDM Mining Ltd. and ATAC Resources Ltd., where she developed strong stakeholder relationships and expertise in BC and Yukon exploration.