Report on the archaeological excavations at the Dolmen de la Font dels Coms archaeological site, located in the western Pyrenees of Catalonia. The site consists of a megalithic tomb that was extensively excavated in 2003 and 2004, including its tumulus. The excavation made it possible to document its use in Roman times, a period in which it was reformulated as a metallurgical production site. The document provides data from the excavation: stratigraphy, materials, 14C dating, etc. Written in Catalan.