The long-delayed El Mutún iron and steel project cleared the final hurdle after President Evo Morales gave green light to the financing conditions.
The court upheld a decision from last year by the country's environmental watchdog.
Junior companies in Argentina, Chile and Colombia published results from their ongoing exploration programs, while a company in Nicaragua provided a new resource estimate.
The US$10mn deal with US aluminum products manufacturer Arconic will strengthen Hydro's downstream position in Brazil.
Minera IRL, which is struggling to line up financing for its Ollachea gold project in Peru, turned around years of losses last year after a strong Q4.
Export revenue could fall by around 13% if the US would impose tariffs on steel imports from Brazil, according to Brazilian research institute Ipea.