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Company Information

Board and Management

Heron has a committed and highly experienced Board of Directors and Management team.


Stephen Dennis

Stephen Bruce Dennis

BCom, LLB, GDipAppFin(Finsia), CFTP
Appointed 6 December 2006
Position: Chairman (Non-Executive)

Stephen Dennis has been actively involved in the mining industry for over 30 years. He has held senior management positions at MIM Holdings Limited, Minara Resources Limited, and Brambles Australia Limited. Until recently, Mr Dennis was the chief executive officer and managing director of CBH Resources Limited, the Australian subsidiary of Toho Zinc Co., Ltd of Japan.

Mark Sawyer

Appointed 19 August 2015
Position: Director (Non-Executive)

Mark Sawyer co-founded Greenstone Resources in 2013 after a 16 year career in the mining sector. Prior to establishing Greenstone, Mr Sawyer was GM and Co-Head Group Business Development at Xstrata plc where he was responsible for originating, evaluating and negotiating new business development opportunities for Xstrata. Prior to Xstrata Mr Sawyer held senior roles at Cutfield Freeman & Co (a boutique corporate advisory firm in the mining industry) and at Rio Tinto plc. Mr Sawyer is a resident of the United Kingdom.

Ricardo De Armas

BS, MBA (Harvard)
Appointed 22 September 2017
Position: Director (Non-Executive)

Ricardo De Armas is an investment professional at Castlelake, where he focuses on emerging market investments. Mr De Armas has more than 10 years of experience in investment and corporate finance, including roles as vice president at De Jong Capital, principal at Zaff Capital, associate at Citigroup’s investment banking division, and financial analyst at Procter & Gamble. His expertise includes value investments, restructuring and financial advisory. Mr De Armas received his MBA from Harvard Business School and a BS from Universidad Metropolitana in Business Administration.

Ian Pattison

BSc (Hons), PhD, MAusIMM
Appointed 29 November 2017
Position: Director (Non-Executive)

Dr Pattison is a highly respected metallurgist with over 30 years of Australian and international experience. His early career was with CRA where he held senior roles in operations, engineering and then as Metallurgy Manager in their base metal division. He joined Denehurst following their purchase of the Woodlawn Mine from CRA to take on an Executive Director role with the Woodlawn and Benambra mines. This was followed by Director and Managing Director roles in the nutrition industries mainly with the German based Henkel/Cognis companies. For the past 10 years he has been the Group Manager Metallurgy for the Australian operations of Japan’s Toho Zinc which incorporates the construction of the Rasp Mine in Broken Hill and operations at the Endeavor Mine at Cobar.


Tim Dobson

Appointed 23 March 2020
Position: Chief Executive Officer

Tim Dobson has over 30 years’ experience leading and developing world-class operations, with a successful track record in transformational leadership through the application of sound strategy, technical capability and building high-performance teams. After a foundational career with Placer Dome in PNG, Australia and Chile, Mr Dobson went on to executive leadership roles with Lihir Gold, Cawse Nickel, and ASX-listed Kimberley Rare Earths, Anova Metals and Polymetals, where he led the development of the White Dam project in South Australia. Most recently, Mr Dobson was Senior Vice President Metals with Sherritt International in Canada and former President of Ambatovy in Madagascar. Mr Dobson holds a BAppSc in Extractive Metallurgy from the WA School of Mines.

Simon Smith

B.Bus, CA
Appointed 11 August 2014
Position: General Manager, Finance & Administration and Company Secretary

Simon Smith has been a chief financial officer of both private and public companies in Australia and the USA. He brings 20 years experience as a Chartered Accountant and holds a Bachelor’s Degree in Business from the University of Technology Sydney. Mr Smith was the CFO and company secretary for TriAusMin prior to the merger with Heron.