First Quantum's $6 billion investment in the open-pit mine, where operations began in 2019, is considered the largest private investment in the Central American country.
At the heart of the case is the free entry mineral claim system that allows anyone to file a mineral claim without notifying or engaging with First Nations.
Concerned shareholders are accusing company CEO and the board of directors of enriching themselves with more than C$6 million for just seven months of service.
