Thompson, who has chaired the company since 2018, has said he will not pursue reelection in 2022, according to Rio Tinto’s board of directors.
“As chairman, I am ultimately responsible for the shortcomings that led to this tragic event,” Thompson said in a statement. “The tragic events at Juukan Gorge are a source of personal grief and deep regret, but also a clear violation of our values as a company.”
Thompson’s announcement comes nearly a year after Rio Tinto, the world’s second largest mining company, blew up the Juukan Gorge Caves in Western Australia to expand an iron ore mine.
The land’s local custodians, the Puutu Kunti Kurrama and Pinikura, fought to protect the caves for years, and their destruction was met with outrage. The caves had considerable archaeological value and deep cultural significance to the Aboriginal people.
Two other executives – Chris Salisbury, head of the iron ore company, and Simone Niven, group leader for business relations – left the company after the incident.
Thompson said in his statement Wednesday that the company is working with investors, the government and indigenous communities to learn from the cave’s demolition.
The board said it has accepted Thompson’s decision and is looking for a successor.