The Brazilian steelmaker reportedly said the head of its mining arm MUSA, Wilfred Bruijn, is leaving the company after nine years.
Canadian companies with gold, silver and copper projects in Mexico disclose asset acquisitions and a change of name.
During a meeting in Brasília, the Brazilian president and the US vice president agreed to continue working to remove trade barriers.
The largest project to enter the system was Gold Fields' US$1.0bn Salares Norte.
Recently merged refractory materials producer RHI Magnesita called the US$23mn investment part of a decisive response to address global pressures in the supply of raw materials to the refractory industry.
Companies active in Peru, Mexico and Chile published updates.
The precious metals fall to six-month lows as global trade fears fail to spark safe-haven investment interest.