Brazilian authorities ordered Hydro in February to slash output from Alunorte, the world's largest alumina refinery.
Brazil Mining News
Law firm leading the action says it has more than 3,000 investors signed up to pursue the miner for losses.
Brazil has been one of the hardest hit countries since the natural resources boom ended.
Iron ore output hit 96.755-million tonnes in the three months to June 30, while pellet output reached 12.838-million tonnes, despite a nationwide truck drivers strike that paralyzed the country in May.
Eike Batista, who was once one of the richest men in the world, was found guilty of bribing former Rio de Janeiro governor Sergio Cabral in exchange for contracts.
OZ Minerals has announced that it has a relevant interest in Avanco of more than 90%, which means the company will now “compulsorily acquire” all of the remaining shares and acquire the fellow copper producer entirely.
The miner, which has set an exploration objective of adding one million gold equivalent ounces to Cerro Moro's mineral inventory, has hiked its exploration budget for 2018 to $11.2 million from $9 million.
Samarco's operations have been suspended since Brazil's mining disaster.
Resolving the legal cases will allow talks with creditors to begin as the company starts to draft its long-term business plan.
The new rules are a clear effort to improve the current legislation as seamlessly as possible, but in close attention to the international industry dynamics and to a number of other sensitive issues (such as environmental recovery and security).
The two separate decrees aim at making the local industry more competitive and sustainable, while while implementing rules on the collection of higher mining royalties.
Transiting Voisey's Bay nickel mine from open-pit operations to underground will cost about $2 billion, and is expected to extend its productive life to 2035.
Government and company officials told CBC News that a "significant" mining announcement would take place on Monday.
Michel Temer is expected to issue a decree next week introducing key changes to mining rules that date back to the 1960s.
The takeover offer, which expires next week, offers great exploration potential because Avanco owns a vast landholding in the copper and iron ore-rich Carajás region, second only to giant Vale.
Global miners face a new reality in Brazil as local, judges included, react quicker and more ferociously to legal infractions.
The company will announce "organic growth" in the coming months.
The company had warned last week that operations at the open pit mine would be affected by the strike, as fuel and consumables failed to be delivered to site, while road blocks on highways prevented sending output to port.
Brazilian miner Vale SA expects iron ore output at its premier S11D mine to reach 58 million tonnes this year.
Structural changes in the world's biggest importer, China, are re-shaping how the industry works.
MINING.com discusses the state of private equity investment in mining with Michael Scherb founder of Appian Capital.
Fabio Schvartsman is pursuing a disciplined approach, keeping tens of millions of tons in the ground each year to prevent another painful glut.
Commercial production is expected in the second quarter of the year.
Australian law firm Phi Finney McDonald alleges BHP knew the dam was at imminent risk of breaking but did not tell markets.
Votorantim said profit was also boosted by sales growth in its aluminum and cement businesses.