The Brazilian steelmaker climbs out of the red after posting losses for 10 consecutive quarters.
The mine came online in 2014 and plant improvement work completed recently will permit Largo to exceed original nameplate capacity by up to 5%.
Ferro-niobium, copper concentrates, calcined alumina and manganese ore shipments to the group of nations also spiked in the period, official data shows.
Fábio Bellotti da Fonseca replaces Marcelo Cordaro, who is leaving the company after eight years.
But purchases and sales of steel were up compared with the previous month.
Prices have recovered somewhat, but miners are still wary. CRU director of copper research and strategy Vanessa Davidson shares with BNamericas her views on spending, production and costs.
Although the country's top three players are whittling down their debt, they still owe a combined US$17bn.