The contract is for the "engineering, supply and construction" of the new terminal, which comprises a 700m docking area, the company said in a filing with local securities regulator SVS.
The total cost of the project is put at 4.75mn UFs (inflation-linked units, some US$230mn).
The new docking area will have a 15m draft. Additional work includes removing an old breakwater and building a new one to expand the port's southern bay.
In late February the regional environmental evaluation service voted unanimously in favor of the project, as BNamericas reported at the time .
Puerto Central, a unit of fellow port operator Puerto de Lirquén and controlled by the local Matte group, won the 20-year concession to build and operator a new multipurpose to handle post-Panamax ships in May 2011.
Phase I of the concession plan involves increasing the port's handling capacity to an annual 2.3mn TEUs from 1.3mn TEUs, and is due to be completed in seven years. Puerto Central has the option of extending the concession by 10 years, pending an additional investment of US$200mn.