Mpumi was appointed Chief Executive Officer of Kumba Iron Ore Limited with effect from 1 January 2022 and joined the Kumba Board as an executive director. She assumed the role of Chairman of the operating entity, Sishen Iron Ore Company (Pty) Ltd. Mpumi was a De Beers Group bursar and officially joined De Beers in 2001 as a process engineer. As part of her production journey, she worked on process improvement and plant design projects, she also worked in various leadership roles within production management. She was appointed General Manager at De Beers Kimberley Mines in 2007, becoming the first female General Manager in the De Beers Group. In 2010, she was appointed General Manager of De Beers Voorspoed mine and three and a half years later became Senior Vice-President of De Beers Sightholder Sales South Africa.Mpumi was promoted to Deputy CEO of De Beers Consolidated Mines in November 2017, rising to the position of Managing Director, De Beers Group Managed Operations, in April 2019. Managed Operations includes De Beers Group's operations in South Africa and Canada.Mpumi holds a BSc in chemical engineering from the University of the Witwatersrand and completed leadership development at the London Business School.Mpumi previously served as a non-executive director of various companies including the Black Management Forum and Mintek. She was a winner of the 2018 Top 100 Global Inspirational Women in Mining awards issued in Mayfield, London.