Minas de São Pedro da Cova — Cavalete de São Vicente Gondomar · Porto · Portugal

The anthracite deposit at São Pedro da Cova, situated to the west of the Serra de Valongo in the Vale do Souto area, was first identified in 1795 when coal was discovered in the parish. Early exploitation was irregular and technologically rudimentary, with extraction confined to depths of around 100 metres and coal carried out by hand in wooden buckets before being loaded into wagons. The administration of the mines passed through several concession holders during the first decades of the nineteenth century.

In 1836 the state-run Intendência Geral das Minas was closed by decree after sustained losses. Concessions had previously been granted to private interests, including a temporary grant to the Conde de Farrobo in 1849 which became a definitive licence in 1854. The Pimenta family subsequently held the concession but did not exploit the mine on their own account.

Exploitation remained uneven until the late nineteenth century. A report of 1890 described the extraction methods as among the most primitive and irregular known, lamenting that a productive mine continued to follow such a poor standard of practice. Around 1909 a new operator — the Empresa das Minas de Carvão — took over the concession and introduced improved coal-treatment methods.

Output reached approximately 6,000 tonnes annually by 1900, rising to 25,000 tonnes by 1914. The opening of the Central Termoeléctrica de Massarelos in 1915 created an important new market for the coal, and from 1918 the extension of a tram line to São Pedro da Cova provided a new transport link. An aerial ropeway to carry coal in suspended wagons from São Pedro da Cova to Monte Aventino in Porto was commissioned under authorisation of 20 November 1913, constructed by the German firm Pohlig of Cologne, and granted its definitive operating licence in 1916.

By the early twentieth century the complex was supplying approximately 70 per cent of Portugal's total coal output. Peak production reached approximately 330,000 tonnes per year, and during the Second World War the workforce approached 1,800 persons. By 1932 annual production had reached 183,289 tonnes of raw anthracite.

The Companhia das Minas de Carvão de São Pedro da Cova took formal control around 1921 and held the concession until final closure. In 1921 the Poço de São Vicente was sunk, reaching 157 metres depth. In 1934 construction began of a reinforced concrete headframe — designed by Belgian engineer Charles Tournay and built by Fernando Moreira de Sá — above the shaft, which was deepened at that time.

The headframe came into service in 1935, rising 38.5 metres and carrying the sheave wheels over which the cage cables ran. The structure was the first reinforced concrete headframe built in Portugal. From 1990 the Mining Department of the Faculty of Engineering of the University of Porto adopted a stylised image of the Cavalete do Poço de São Vicente as its departmental logo, an acknowledgement of the structure's technical and national significance.

The hegemony of the São Pedro da Cova coalfield began to decline from the mid-1950s as competition from fuel oil and petroleum intensified. The colliery continued to operate, but with increasing difficulty. In the early 1960s the Pejão coalfield in Castelo de Paiva surpassed São Pedro da Cova as Portugal's most productive mine.

On 4 March 1970 the Companhia das Minas posted a notice at its offices announcing imminent closure, citing the cancellation of coal deliveries to the Central da Tapada do Outeiro by the Companhia Portuguesa de Electricidade and the failure of integration negotiations. Mining ceased on 25 March 1970, after approximately 170 years of operation. At the time of closure the workforce comprised 312 underground workers, 171 surface workers, and 85 women, with a final-year output of 101,000 tonnes.

Between 1970 and 1972 the Companhia retained a reduced workforce to dismantle recoverable materials — iron, steel, sheet metal, and timber were stripped and sold — a process that accelerated the deterioration of the surviving buildings. The aerial ropeway ceased operation in 1970 and was subsequently demolished, reportedly by 1973. An attempt to reactivate mining proved unsuccessful, and the concession was eventually sold to the firm Terriminas.

During the Verão Quente of 1975, following the 25 April 1974 revolution, the population occupied the company offices, giving rise to the Centro Revolucionário Mineiro, from which the first Museu Mineiro was inaugurated on 22 May 1976 in the basement of the former company building. In 1987 the Junta de Freguesia of São Pedro da Cova acquired a former Casa da Malta in the Vila Verde area from the Companhia das Minas de Carvão, and in 1989 the Museu Mineiro was formally established there, dedicated to the industrial, geological, and mining heritage of the parish. A classification process for the Cavalete do Poço de São Vicente opened in 1996 under the auspices of the Direcção Regional do Porto of the IPPAR.

Following a civic campaign and parliamentary pressure over many years, the structure and the installations of the Poço de São Vicente were classified as a Monumento de Interesse Público by Portaria nº 221/2010, published in the Diário da República on 19 March 2010. The classification noted the historical, technical, and social value of the structure and described the headframe and the landscape of the former couto mineiro as the principal surviving testimony to nearly two centuries of mining activity in São Pedro da Cova. The Museu Mineiro de São Pedro da Cova remains open to the public, operating from Tuesday to Saturday, with guided visits to the Cavalete available by prior appointment.