In 2018, a Congolese-American businessman Charles Brown filed a lawsuit in Congolese court, claiming that he sold a 19.12% stake in Mutanda to Groupe Bazano under threat of violence on May 9, 2012. Glencore purchased Groupe Bazano's share in the mine two weeks later on May 22. Glencore denied this, saying Brown's stake was sold in 2004 and 2005.
