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Brazilian stock market losses were limited by a rise in shares of miner Vale SA as prices of China-listed iron ore futures extended their rally.
Iron ore miner BHP Billiton signaled budding signs of recovery in the long downtrodden commodities market.
Deutsche Bank on Monday upgraded three mining stocks to buy from hold, citing strength in the commodities complex and improving fundamentals.
BHP Billiton reported a record $6.4 billion annual loss on Tuesday, hammered by a bad bet on shale, a dam disaster in Brazil and a commodities slump.
The market for iron ore has been in decline since 2011, but things may be looking up for the steel-making ingredient.
BHP said the provision partly reflected uncertainty on when Samarco, its iron ore joint venture with Brazil's Vale, would restart.
The pace of mergers and acquisitions in agribusiness shows no signs of letting up.
Mosaic, the world's top producer of concentrated phosphate, has entered talks to buy Vale's fertilizer unit, sources familiar with the matter said.
Goldman Sachs warned on Friday that benchmark iron ore prices could slump further due to a growing supply surplus.
Brazil's president will not be resigning Tuesday, despite rumors that she may step down ahead of further impeachment proceedings.
Brazilian traded sharply lower after President Dilma Rousseff's impeachment process was annulled.
The dollar's 5-day rally & China growth concerns are making for an ugly day in commodities and commodity stocks.
Asian markets joined the slump in global equities, as the U.S. dollar strengthened and oil prices lost ground.
Vale and BHP Billiton are facing one of Brazil's largest civil lawsuits after prosecutors demanded $44 billion in damage, the Financial Times reports.
Some of the world's biggest iron ore miners are slashing output targets, a move likely to fuel price gains for the commodity.
An iron ore oversupply still needs to "work through the system," Fortescue chairman Andrew Forrest warned.
CNBC "Halftime Report" trader Jon Najarian bought shares of Rio Tinto after spotting unusual options activity.
China shares eked out gains Tuesday even as most Asian markets slipped, with traders digesting weaker-than-expected trade data from the mainland.
The world's no.1 and no.4 iron ore miners are in talks that could see Brazil's Vale taking a minority stake in Australia-based Fortescue Metals Group.