Vale's corporate governance battle has intensified with the sudden resignation of its chair, Daniel Stieler. The departure follows weeks after the board rejected a proposal from Previ, the mining giant's largest domestic investor, to replace him. This move reignites concerns over alleged political interference at the $68 billion company, a globally significant iron ore producer deemed of strategic national importance in Brazil.

Shareholders are now set to vote on two board members for the chair position: Marcelo Gasparino da Silva, who has warned of political interference risks, and Manuel Lino Silva de Sousa Oliveira, Previ's preferred candidate. Previ denies government involvement, stating its aim is to improve strategic management and corporate governance. The pension fund intends to cease nominating future chairs next year, signaling a commitment to greater transparency.

This governance dispute echoes a previous crisis two years ago concerning CEO succession. While the Brazilian state holds only "golden shares," its influence on strategic decisions at Vale remains a point of contention. Analysts express skepticism about Previ's motivations but view the election of an independent chair as a positive development for governance.