In 1951, and under a contract signed with Empresa de Cobre de Angola for the execution of a geotechnical prospection campaign in the Mavoio cupriferous deposit, Teixeira Duarte executed more than 3,000 metres of rotation boreholes with depths of up to 300 metres and, in the following year, carried out cement injections in the Biópio Dam.

In 1955, Teixeira Duarte was responsible for geotechnical reconnaissance work in the beds of the Mandovi, Zuari and Chaporá rivers and the foundations of the Sanquelim and Assolnã-Salcete bridges in what was then Portuguese India.

The activity in Angola was interrupted, being resumed in the second half of the 70's, through the execution of the foundations for the Microwave Telecommunication System.