McCabe served as CEO of Stanmore since April 2020 and was involved in the transition of the company to its majority owners Golden Investments.
Stanmore said Matos has been appointed as interim CEO to ensure an orderly transition of leadership.
McCabe will be available to the business, if required, until September 30 to work with Matos and the leadership team to manage the transition.
"The board would like to thank Mr McCabe for his focus on operational performance excellence and advancement of approvals for the development of the Isaac Downs and Isaac Plains East Extension projects," Stanmore said.
Matos will remain a director of the company throughout the appointment.
He has more than 20 years of experience in management, marketing, strategy and planning, and business development roles in the mining sector in Australia, Asia, Mozambique and Brazil.
Matos worked for Vale for many years in various senior roles, including as its chief marketing and strategy officer for coal as well as its managing director in Australia, where he was responsible for the various operations and projects in Australia, including Vale's interests at the Isaac Plains Joint Venture at the time.
Matos' executive role prior to this appointment was as chief commercial officer for M Resources.
He holds a Bachelor of Business Administration degree from the Pontifical Catholic University, Rio de Janeiro, Brazil, and an Executive MBA from IBMEC Business School.