Preserved iron malacate headframe over the Poço Viana shaft, now the reception point of the Parque Mineiro de Aljustrel heritage park.
The Malacate Viana is the iron winding headframe erected over the Poço Viana shaft at the Minas de Aljustrel complex, lying within the Iberian Pyrite Belt in the Baixo Alentejo. The shaft takes its name from Francisco Vianna, administrator of the banking house Fonseca, Santos & Vianna in the late nineteenth century, which held the mining concession before the formation of the Société Anonyme Belge des Mines d'Aljustrel in 1898. For many years the Poço Viana served as the principal access shaft to the Mina de Algares, and its malacate — a Spanish-derived term denoting the tower headframe characteristic of the Iberian Pyrite Belt — was the main means of raising ore, equipment, and personnel between the surface and the underground galleries.
The Malacate Viana is one of three surviving malacates at Aljustrel. When the Parque Mineiro de Aljustrel opened on 4 December 2023, the reception and interpretation centre was installed adjacent to the Malacate Viana, making it the formal arrival point for visitors to the park.
The Poço Viana shaft is part of the Minas de Aljustrel complex, one of Portugal's oldest continuously worked mining districts. The site lies on the Iberian Pyrite Belt, where exploitation of copper, iron, silver, and pyrite is documented from the Chalcolithic period and intensified under Roman occupation, which established the settlement of Vipasca near the Algares orebody by the end of the first century BC. After the Roman withdrawal, mining declined and remained sporadic through the medieval period.
The large-scale industrial phase began in 1848 with the first documented modern concession at Aljustrel. The concession passed through several operators — Sebastião Gargamala, the Lusitanian Mining Company, and then the Companhia de Mineração Transtagana — before the Transtagana company's bankruptcy transferred the concession to the banking house Fonseca, Santos & Vianna. Francisco Vianna was an administrator of this banking house, and the Poço Viana shaft was named in his honour. In the records of the period, the Poço Viana served as the main access shaft for the Mina de Algares, fulfilling a central role in the everyday movement of miners and material between surface and the underground workings.
The term malacate, derived from Spanish usage in the Iberian Pyrite Belt, designates a tower structure seated above a mine shaft to carry the sheave wheels and steel hoist cables from which the cage is suspended. The cage, a metal cabin of one or two decks, transported not only workers and ore waggons but also mules used for underground traction. The earliest malacates at Aljustrel, built around the mid-nineteenth century, were timber-framed and powered by mule teams; subsequent wooden structures were driven by steam engines and later by lean-gas motors. The Malacate Viana, built in iron and driven by an electric motor, represents the later generation of these structures.
In 1898 the banking house Fonseca, Santos & Vianna, in partnership with Belgian and Portuguese investors, formed the Société Anonyme Belge des Mines d'Aljustrel in Antwerp and secured the concession on 26 May 1898. Under the Belgian company the mines were substantially expanded, with new worker housing, schools, and hospitals constructed in the surrounding quarters. The Poço Viana continued to serve as the principal access shaft to Algares throughout this long period of Belgian administration. Active extraction at Aljustrel underwent several operational disruptions — suspension in 1993, brief resumption between 2006 and 2008, and final suspension in November 2008 due to the global financial crisis.
Following the end of active extraction, environmental remediation works were undertaken across the decommissioned areas of the complex by the Empresa de Desenvolvimento Mineiro. Heritage improvement works were subsequently carried out at the Malacate Viana, which was identified as a principal node of the proposed Parque Mineiro de Aljustrel. When the park opened officially on 4 December 2023, the Centro de Receção e Interpretação — the visitor reception and interpretation centre — was installed in a building adjacent to the Malacate Viana, making the headframe the formal arrival point for all guided visits. The Malacate Viana is described by local sources as one of three surviving malacates in the Aljustrel complex, the others being the Malacate Vipasca and the Malacate de São João do Deserto.