The Museu da Lousa is composed of 3 houses, built with the traditional technique, such as the exterior wall. The first house evokes a miner’s house, with a kitchen area, a nocturnal rest area and the workshop, where women and children made penas de lousa (slate pencils) during the evening to complement the small salaries earned at the mine. In the other 2 buildings are displayed the estate and documentation related to the slate, from its extraction to the several types of transformation. Of noteis the set of machines used for making school slates used by generations of students spread all over the world and the exhibition of works in slate created by students of Vallis Longus schools in the discipline of Arts in Slate.