The economy ministry has extended 15% steel tariffs to cover steel plate following a sharp rise in imports, while other products not currently produced in the country are exempted.
Construction could start this month following a supreme decree allowing access to a credit line.
Companies in Ecuador and Colombia published results from their drilling campaigns, and a company in Mexico said it had identified four mineralized zones.
A sequence of uncontrolled computerized actions is thought to be the cause of an explosion that injured 34 workers at the Brazilian plant, but a more extensive investigation will follow, Usiminas said.
Following a staking rush by miners such as Anglo American, Nexa Resources and Codelco looking for copper porphyry in Brazil's Juruena belt, Altamira Gold, which owns 9 project areas in the region, says it is well positioned to take advantage of the findings, while doing its own exploration work.
Unions and management reach agreements at both mines following mediation.