The closure of the coal mines Historical milestone · Cercs, Berguedà, Barcelona Image of Cercs, not of the place itself. The working of lignite sustained for a century the mining colonies of the upper Llobregat. The definitive closure, in 1991, left empty pits and settlements and hastened the depopulation of the comarca. 1991 Photo: Herodotptlomeu (CC BY-SA 3.0) What to see and do in Cercs