About Us


About Trevali


Our purpose is to be the world’s best sustainable underground mining company.



We are stronger when we work together.



We embrace people for who they are and we value differences.



We take on big challenges and we deliver.



We care for each other, the environment and the communities we touch.


Management Team


Ricus Grimbeek, President and CEO

Ricus Grimbeek is an experienced mining executive with nearly 30 years of progressive experience in the resource sector, and has a proven track record working at all levels of the business. Before joining Trevali, he was the Chief Operating Officer of Vale Base Metals North Atlantic, where he held responsibility for the overall operating and financial performance of 16 mining and refining operations in four countries. He was also previously the President and COO of South32 Australia, overseeing 6 operations in Australia and Colombia. He has also served as Asset President of Aluminium Australia, Head of Group HSEC for BHP Billiton, President and COO of BHP Billiton’s Ekati Diamond Mine, Executive Vice President Mining and Concentrating for Lonmin Platinum. Ricus holds a Bachelor of Engineering (Mining) from the University of Pretoria, has completed the Management Development Program from the University of Orange Free State, and holds an Advanced Certificate in Mine Ventilation from the Chamber of Mines.


Steven Molnar, Chief Legal Officer

As Chief Legal Officer, Steven Molnar is responsible for all legal matters involving Trevali and its subsidiaries, in addition to providing leadership and direction on matters relating to corporate governance and enterprise risk management. Before joining Trevali, Steve practiced corporate and securities law at McCarthy Tétrault LLP, where he provided advice on a variety of matters and transactions including corporate governance, regulatory compliance and public company reporting, mergers, acquisitions and dispositions, equity and debt financings, joint ventures and other commercial arrangements in the mining industry. Steve holds a law degree from Osgoode Hall Law School and a Bachelor of Arts from Simon Fraser University. He is a member of both the British Columbia and Ontario Bars.


Joanne Thomopoulos, Chief People Officer

Joanne Thomopoulos is an influential senior HR leader with over 15 years of direct leadership experience. Before joining Trevali, she spent over 10 years at BC Hydro and 8 years at BCLC where she championed key strategic HR initiatives that leveraged talent to maximize business efficiencies. She has led workforce redesign projects, developed performance management and talent development frameworks, and provided strategic guidance on mergers, acquisitions and integrations. She is a Chartered Professional in Human Resources, holds a Strategic Human Resources Management Graduate Certification, Advanced Certification in Management and a Diploma in Criminal Justice. She is also a certified coach and facilitator for Kouzes and Posner’s leadership practices.


Derek du Preez, Chief Technology Officer

Derek du Preez brings over 25 years of experience working at some of the world’s largest and most complex mining operations, leading major digital transformation and innovation programs, championing industry-first applications of IoT and AI technologies and providing strong strategic guidance and technical expertise in relation to feasibility, planning and turnaround strategies to ensure optimal value for the business. Before joining Trevali, Derek was the Principal Consultant at AMC Consultants. Prior to that, he held the position of Director, Digital Transformation, North Atlantic at Vale Canada and Head of the Digital Delivery Centre at South32. He holds a Bachelor of Engineering Technology and Mechanical Engineer’s Certificate of Competency from South Africa, is a Technologist Member of the Institution of Engineers Australia in the Mechanical College, and is experienced in Agile Delivery, SCRUM and Design Thinking.


Amber Johnston-Billings , Chief Sustainability Officer

Amber Johnston-Billings brings a wealth of knowledge and experience where she has led and delivered successful strategic sustainability initiatives and projects across a broad range of industries, including large global mining companies. Prior to joining Trevali, Amber was a Director at KPMG where she led sustainability strategy and climate change for the Australian firm and supported a large number of companies across a range of sectors, including large diversified multinational and small cap mining companies. Amber was previously the Head of Sustainability and Reporting at South32 where she designed and led sustainability integration and performance improvement programs, as well as external and internal disclosure and reporting. At South32, Amber was the Principal Liaison to the International Council of Mining and Metals (ICMM), where she advocated and supported sustainability performance improvements across the global mining sector. Amber also worked for the United Nations based in Ghana, where she helped sub-national governments advance the green economy and collaborated with West African communities in mining resource governance and to develop resilience to climate impacts. Amber started her career in mining at multi-national mining services provider, Macmahon, leading capability development with a focus on culture, talent management and leadership. Amber holds a Masters of Science and Bachelors degree (with Honours) in Psychology, a Diploma in International Climate Policy and Carbon Management and a number of credentials in peace and conflict, circular economy and environmental law.

Board of Directors

Jessica McDonald, ICD.D, Chair


Jessica McDonald currently serves as Chair of Canada Post, which includes in its Group of Companies a majority shareholding of Purolator Courier, and subsidiaries Innovapost and SCI Logistics. She has previously served as President and CEO of Canada Post on an interim basis. Prior experience includes President and CEO of BC Hydro, Chair of Powertech Labs Inc, and Board Director of Powerex Corp. She serves on the Member Council of Sustainable Development Technology Canada, and was previously a Visiting Fellow at Stanford’s Center for Energy Policy and Finance. She is a Director of the Board of Trade of Greater Vancouver, as well as a Board Director of Hydro One and Coeur Mining. She has significant experience in Government including Deputy Minister to the Premier and and Head of the Public Service of British Columbia. She is a certified ICD Board Director and a member of the Alternative Dispute Resolution Institute of Canada. She has been named to Canada’s Top 100 Most Powerful Women Hall of Fame, Canada’s Diversity 50, and Canada’s Top 40 Under 40.

Dan Isserow, Director


Dan Isserow is a Chartered Accountant with financial and business operations leadership experience and a successful track record of growing organizations across various business sectors, including introducing the Nando’s restaurant franchise to Canada and serving as its President and CEO from 1993 to 2012. He is currently the Co-Founder, President and Chief Financial Officer with Silica Ventures, a company focused on the expanding market for digital sign applications; with customers in Canada and the United States. He is a Chartered Accountant from the Institute of Chartered Accountants of South Africa. He has also completed the ICD Directors’ Education Program (DEP).

Russell Ball, Director


Russell Ball was most recently Executive Vice President, Chief Financial Officer and Corporate Development of Goldcorp Inc., a role he assumed in March 2016 after initially joining Goldcorp Inc. in 2013 and serving as Executive Vice President of Capital Projects, Strategy and Corporate Development, including oversight of their primary growth projects. Prior to his role with Goldcorp Inc., he served in varying capacities for Newmont Mining Corporation, including Strategic and Business Planning, culminating with his appointment as Executive Vice President and Chief Financial Officer. He currently serves on the Board of Lydian International, Calibre Mining Corp, Allegiant Gold Ltd. and Columbus Gold Corp. He is both a Chartered Accountant from the Institute of Chartered Accountants of South Africa and a Certified Public Accountant in Colorado.

Dr. Mark Cruise, Director


Mark Cruise co-founded Trevali in 2007 and served as its President and CEO from February 2008 to April 2019. He has previously served as the Vice President, Business Development of Cardero Resources Corp. from March 2007 to September 2011, and Vice President, Exploration from November 2004 to March 2007. From 1996 to 2004, he was the Senior Geologist with Anglo American plc. He is currently a director of Velocity Minerals Ltd., and a Trevali-nominated director of Prism Resources Inc. He holds a Doctorate of Geology and Bachelor of Geology from the University of Dublin, Trinity College, and is a professional member of the Institute of Geologists in Ireland and the European Federation of Geologists.

Chris Eskdale, Director


Chris Eskdale joined Glencore International A.G. in January 1997 as Asset Manager and is currently Head of Zinc Industrial Assets for Glencore. Prior to this, he was an accountant at Deloitte & Touche in London and Moscow. He currently serves on the Board of a number of international mining companies, specifically: Compania Minera Volcan S.A.A., a Peruvian listed mining company engaged in the extraction and production of zinc, lead and copper concentrates (since 2012); the Noranda Income Fund (since 2013); and Recylex S.A., a Paris-listed company processing zinc and lead materials (since 2014). He holds a Master of Arts (Honours) degree from the University of Oxford and qualified as a Chartered Accountant in July 1994 with the Institute of Chartered Accountants in England and Wales.

Jill Gardiner, Director


Jill Gardiner is a professional corporate director and previously spent over 20 years in the investment banking industry, most recently as Managing Director and Regional Head, British Columbia, for RBC Capital Markets. In her various roles in corporate finance, mergers and acquisitions, and debt capital markets she provided strategic advice to, and helped raise capital for, numerous corporations with a focus on the power, pipeline, infrastructure, forest products and diversified industries. Ms. Gardiner is currently on the board of Capital Power Corporation and previously served as the chair of the board of directors of Turquoise Hill Resources Ltd. and as a director of Capstone Mining Corp., Parkbridge Lifestyle Communities Inc., SilverBirch Hotels & Resorts and Timber Investments Ltd. She was also formerly Senior Project Manager at the Ontario Energy Board and a lecturer at the University of Victoria in corporate finance and human resource management. Ms. Gardiner holds a Bachelor of Science and a Master of Business Administration, both from Queen’s University.

Dan Myerson, Director


Dan Myerson is currently the head of Glencore’s Canadian zinc business, and has worked closely with Trevali at both the corporate and operations level. Prior to joining Glencore, he worked in the global capital markets division of Morgan Stanley with a principal focus on the Asia-Pacific region. He holds a Master of Finance (Honours) degree from the Queensland University of Technology in Brisbane, Australia.

Richard Williams, Director


Richard Williams is a former Chief Operating Officer at Barrick Gold Corporation and Barrick’s Executive Envoy to Tanzania (2014 to 2018). He has also served as Chief Executive Officer of the Afghan Gold and Minerals Company (2010 to 2014) and as a non-executive director of Gem Diamonds Limited, listed on the London Stock Exchange (2018 to 2015). In addition to his mining experience, Mr. Williams served as the Commanding Officer of the British Army’s Special Forces Regiment, the SAS. He has an MBA from Cranfield University, a Master’s Degree in Security Studies from Kings College London, and a Bachelor of Science in Economics from University College London. He is also on the Board of Canada’s Vimy Foundation, a charity with a mission to preserve and promote Canada’s First World War legacy, and London’s Mine and Money Conference.

Committee Composition