CSN is aiming to reduce debts that piled up after an iron ore and steel price rout in 2015-2016 and a severe recession in Brazil, prompting investors to demand asset sales.
The move gives the company mineral rights to an additional 200-metre strike length at Carlin, considered the largest vanadium deposit in North America.
Miner has unveiled plans to make an all-share offer for Cornerstone Capital Resources, a Canadian firm that has a 15% interest in SolGold's coveted Cascabel copper-gold project.