Rio Tinto has appointed Stephen McIntosh as the acting manager in the role.
Lilleyman has made a significant contribution to the development of Rio Tinto’s Pilbara operations, where he has spent the majority of his time with the business.
He also held senior operational roles in the Hunter Valley of NSW and Canada.
Rio Tinto CEO Sam Walsh said: “Greg has had a long career with Rio Tinto and played an important role in the development of our industry leading Mine of the Future program in our Pilbara iron ore operations and has led our productivity drive. We wish him well for the future.”
McIntosh has been with Rio Tinto for almost 30 years working on projects in more than 45 countries.
Most recently, he was head of Exploration, leading a 450-strong global team of employees operating in 20 countries.
Prior to this, McIntosh led Rio Tinto’s Project Generation Group for six years and transformed its activities to build a world-leading team of commodity, technical and ore body knowledge experts.
Walsh said: “Stephen is a highly respected member of Rio Tinto’s senior leadership ranks and brings to his new role a breadth of experience across multiple commodities and geographies.
“For a long time now, our T&I function has provided a point of strategic differentiation for Rio Tinto and Stephen will spearhead the Group’s drive for further productivity improvement across the business.”
McIntosh will join the Rio Tinto Executive Committee with immediate effect and retain the Exploration portfolio.