The spread in the Asian country is now at the highest level since 2010, but flat steel prices in China should not rise further.
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.
The two workers were trapped underground for close to 24 hours.
The latest news from junior mining companies operating across Latin America and the Caribbean.
Freeport-McMoRan reports third-quarter and nine-month 2017 results