also expanded its domestic operations during the 1980s. Projects the company completed during the 1980s include the Confins International Airport located in Minas Gerais, the Lagoinha tunnel in Belo Horizonte and the canalization of the Ribeirão Arrudas. Andrade Gutierrez also constructed the Carajás railroad, which spans 892 kilometers and connects Maranhão and Pará. Diversification in the 1990s The company started to diversify its portfolio in the 1990s, when it expanded into public concessions and telecommunication. Andrade Gutierrez's industrial business unit achieved its first Brazilian engineering work, the Duque de Caxias Refinery (Reduc), and began a partnership with Petrobras. The company's first concession was with the CCR (Highway Concessions Company), which became the biggest controller of highways under concession in Latin America. Andrade Gutierrez entered the telecommunications market with the creation of AG Telecom in 1993. In 1998, the company won the auction for the privatization of Telebrás and integrated the operation of Telemar, which was renamed Oi in 2006. The company later founded Contax, one of the three largest contact center companies in the world. Andrade Gutierrez relocated to Argentina in 1996, where it keeps its infrastructure undertakings. Operations Andrade Gutierrez's African operations are focused on Mozambique, Angola, Nigeria, Ghana, Equatorial Guinea, the Congo Republic and Algeria. The company's Latin American operations are focused in Colombia, Peru and Venezuela. Its projects include hydroelectric power plants, thermoelectric power plants, nuclear power plants, petrochemical plants, mining, steel industry, refineries, harbors, subways, sanitation and urbanization, airports, railroads, and civil engineering. Globally, the company focuses on mining, harbors, logistic terminals, highways, and industrial plant projects (such as steel and petrochemical). Corporate Structure The company consists of a Board of Directors including the main company executives. Below are 5 market committees that assist the Group in making strategic decisions. Above governance, there is the Council of Shareholders, which is formed by both Andrade and Gutierrez families. Both Andrade and Gutierrez families divide the company's social capital in three equal parts, and each family has a company linked to the group. Divisions Engineering and construction In the engineering segment, AG operates in the construction of hydroelectric power plants, thermoelectric power plants, nuclear power plants, petrochemical plants, mining, steel industry, refineries, harbors, subways, sanitation and urbanization, airports, railroads, civil engineering. In July 2013, Andrade Gutierrez began constructing the Serra do Sul mine in Pará, Brazil for the Vale mining company. The mine is planned to be the