By David Winning

SYDNEY--BHP Group Ltd. said David Lamont will start as chief financial officer at the beginning of December, the latest leadership change at the world's largest mining company by market value.

Mr. Lamont is joining BHP from Australian pharmaceutical company CSL Ltd. where he ran the finance department. He will replace Peter Beaven who will step down as CFO on November 30 before leaving BHP in early 2021 after a handover period.

"Having decided to pursue his own personal ambitions, Peter committed last financial year to support BHP through the transition from Andrew Mackenzie to a new CEO," said Mike Henry, BHP's chief executive.

Mr. Lamont worked for BHP between 2001 and 2006, including as chief financial officer of the company's Carbon Steel Materials and Energy Coal businesses. He has also held senior roles at other Australian-listed companies, including copper-gold miner Oz Minerals Ltd. and mining explosives maker Incitec Pivot Ltd.

Write to David Winning at david.winning@wsj.com