The consortium submitted a bid of Reais 424.7m ($US 105.4m) for the two-station extension, the lowest offer in the tender.
The initial budget for the project was estimated at Reais 786.9m.
The works are scheduled to begin in March 2020 and construction is expected to take 30 months, including eight months for planning and design, according to Camargo Corrêa Infra.
The award represents the first major public works project contract won by Camargo Côrrea since its involvement in the Lava Jato (Car Wash) scandal, the largest-ever corruption case in South America.
Despite having the best proposal, Camargo had been disqualified by the tendering committee in February this year due to financial problems at TSEA, one of the members of the consortium.
