Stories of Cabeceiras

The municipality’s Archaeological Survey describes a geological setting rich in wolframite and cassiterite. These names add a mineral dimension to the landscape of granite and metasedimentary rocks: they describe the composition underground, beyond the shape of the hills.

Wolframite contains iron, manganese and tungsten. Virtual Microscope, a project involving the Open University and Royal Cornwall Museum, explains its importance as a tungsten ore. Cassiterite is a tin oxide with the formula SnO₂ and an important commercial source of that metal, according to the USGS. They are different minerals associated with different metals.

A mineral is not the same thing as the metal that can be obtained from it. Wolframite is not a piece of metallic tungsten, just as cassiterite is not ready-to-use tin. These names are interesting precisely because they connect matter found in nature with materials transformed by people.

The municipal description confirms the local geological reference. International sources help explain the minerals, but their mining examples belong to other territories. None of these explanations identifies a mine to visit, an active operation or a collecting site here.

The municipal inventory links the Ponte de Arame de Padroselos to tin mining. Entry Po.27 describes iron, wood and a ruined condition, without supplying the survey date.

Ponte do Freixo, in Torneiro, formed part of the path between Cunhas and Torneiro. Entry Po.28 records granite and an absence of parapets. In Po.29, Ponte de Arames over the Beça appears with a concrete deck supported by five piers. These two entries are dated 20 March 2008.

These are three different references. The inventory reveals the memory of connections but does not confirm present conditions or suggest crossings.