[2] It terminates in the northwest with a hidden by tertiary cover and constitutes the Paleozoic basement where the main two Gavião orebodies occur, with 30 metric tons (66,000 lb) of total massive sulfides.

[3] At the end of the first century, Mangancha began to be occupied by a Roman settlement, with military garrison, leading to the establishment of a colony at Vipasca, near Algares (today known as Valdoca or Vale da Oca).

[3] Owing to a series of unfavourable conditions in the international market, the company went bankrupt and the concession was passed to the banking firm Fonseca, Santos & Vianna.

[3] In June 1973, it was taken over by the company Pirites Alentejanas, SARL, with a major stake by national interests (50% by the State, 40% by CUF and a fixed 10% by Mines d’Aljustrel).

[3] Yet, in 1977, with discovery of the Neve-Corvo mine (worked by Somincor at the time) containing rich orebodies, lead to renewed exploration due to its economic potential.