Thompson, who has chaired the company since 2018, told the Rio Tinto board that he will not seek re-election in 2022, according to the company.
“As president, I am responsible for the failures that led to this tragic event,” Thompson said in a statement. “The tragic events at Juukan Gorge are a source of personal sadness and deep regret, as well as being a clear violation of our values as a company.”
Thompson’s announcement comes almost a year after Rio Tinto, the world’s second largest mining company, blew up the caves at Juukan Gorge in western Australia to expand an iron ore mine.
The local guardians of the land, the Puutu Kunti Kurrama and Pinikura peoples, fought for years to protect the caves and their destruction was met with indignation. The caves had significant archaeological value and profound cultural significance for Aboriginal people.
Two other executives – Chris Salisbury, head of the iron ore business, and Simone Niven, executive of the group for corporate relations – also left the company after the incident.
Thompson said in his statement on Wednesday that the company has engaged with investors, government and indigenous communities to learn from the demolition of the caves.
The board said it accepted Thompson’s decision and will seek a successor.