The position on Brazil's third largest steelmaker was vacant since May 2016.
Sherritt International is working to restore full operations at its nickel and oil and gas assets in Cuba in the wake of Hurricane Irma.
Vancouver-based MaxTech Ventures published details of exploration and operational update on all activities in Brazil.
The Mt. Holland project is SQM's first spodumene lithium project.
July was a strong month for Peru's miners, who increased output of copper, gold, silver, zinc, tin, molybdenum and iron ore.