![](https://sciencepress.mnhn.fr/sites/default/files/periodiques/visuels/grand/bandeau-superieur-palevol-modele-2023_0.jpg)
Fire-setting to open up mines has been used on hard rock since prehistoric times. In the copper-mining district of Cabrières, the existence of metre-sized spherical or sub-spherical cavities, sometimes spaced along the same vertical in an ore seam, has usually been ascribed to this method
fire-setting, copper mines, Bronze Age, Cabrières, southern France