The country has become the 53rd member state of the Norway-based Extractive Industries Transparency Initiative.
The Chile-focused miner is expected to produce 705,000-740,000t in 2018.
Brazilian steelmaker ordered a major revamping of caster no. 2 located in Serra, Espírito Santo state.
Two other measures still to be voted on would change mining royalties in the country, and reform a set of mining rules in place since 1967.