Board Members
Our diverse and experienced Board is committed to high standards of governance that deliver great outcomes for all of our stakeholders.
Our diverse and experienced Board is committed to high standards of governance that deliver great outcomes for all of our stakeholders.
Appointed 5 February 2024
Jeff is a senior executive with extensive experience in civil contracting and contract mining, strategic planning, mergers and acquisitions and capital structuring. Jeff has previously been Executive General Manager of the largest drill and blast contractor in Australia , CFO of a large Queensland based civil and mining contractor and CFO of an ASX200 agribusiness. Prior to transitioning into the corporate sector, Jeff built deep corporate finance skills with PwC and was the Queensland Head for a large mid-market private equity business.
Jeff is a Fellow of the Institute of Chartered Accountants in England & Wales, a Corporate Financier, a Graduate of the Australian Institute of Company Directors and holds a Bachelor of Engineering (Honours) in Civil Engineering.
Appointed 10 October 2025
Appointed Chair 20 November 2025
Caroline is an experienced Non-Executive Director and senior executive with over 20 years' expertise in banking, finance and corporate strategy. She has held various senior leadership roles with Westpac Banking Corporation, including Head of Institutional Banking for Western Australia & South Australia and Chief Operating Officer of Corporate & Institutional Banking where she drove strategic growth initiatives and led operational transformations. Prior to Westpac, she developed corporate finance experience at Deutsche Bank and NM Rothschild, and gained commercial experience at Singtel Optus and Perth Airport.
Caroline is currently a Non-Executive Director of Stanmore Resources Limited, and previously served on the Australia-ASEAN Council (advisory Board to the Australian Government). She brings extensive governance, financial and risk management skills to the Board.
Caroline is a WA Business News '40 under 40' award winner, and is a passionate advocate for diversity, inclusion and sustainable business practices. She holds Bachelor of Laws and Bachelor of Commerce (Accounting & Finance) degrees from the University of Western Australia, a postgraduate Diploma in Applied Finance & Investment from the Securities Institute of Australia, and is a Member of the Australian Institute of Company Directors.
Appointed 10 March 2010
Together with Darren Hamblin, Andrew co-founded Mastermyne in 1996. They saw an opportunity and together built a team to share in it; quickly developing a reputation as a business that people liked to work for and stakeholders wanted to deal with.
Coming from a dairy farming background and with trade under his belt, Andrew was never shy of hard work. He was responsible for all aspects of Mastermyne's operations until stepping back to an Executive Director role in 2005. Straight as a die and staunchly devoted to his family at home and at work, the foundation values Andrew and Darren instilled all those years ago still hold true in the business today.
After playing an important role in the companies listing in 2010, Andrew transitioned into a Non-Executive role in 2013. Andrew brings to the Board a shrewd contracting mindset and he remains very passionate about the business and the people in it.
Appointed 1 July 2025
Mr Gargett is the Group Chief Financial Officer of the M Group. As Group CFO, Ben oversees finance, financial consolidation, asset advisory and group-level management.
Prior to his appointment, Mr Gargett was an audit and CFO Advisory partner at PwC. He has specialised in the mining and resources sector, working extensively with top-tier clients across a diverse range of commodities.
Mr Gargett is a Steering Committee member of the Melbourne Mining Club, a Director of the National Asthma Council of Australia, and has served as Vice Chair of the Australia-Africa Minerals & Energy Group (AAMEG).
Qualifications: BComm (Accounting & Finance); CA
Appointed 9 June 2025
Mr Bull is an Executive Adviser for M Group, providing strategic management support, insight and advice across operating entities, projects and future acquisition diligence advice. Prior to this appointment, Mr Bull operated a private consultancy service providing executive advice and support to major mining companies, and held numerous senior roles at Anglo American, South32, WDS ltd. and Thiess Contractors.
Mr Bull is a Mining Engineer with over 40 years' experience in the resource sector, holding Statutory Mining Qualifications as Site Senior Executive and Mining Engineering Manager in Queensland, NSW and UK.
Qualifications: Higher National Diploma in Mining Engineering UK; GAICD