Documentary about the gold mining history in Valongo (Porto, Portugal) and speleological exploration of said 2000 years old mines.

By : AltoRelevo Clube de Montanhismo
Team members : João Montinho, Vitor Gandra e outros
Original title : Roman gold mining in Valongo (Porto, Portugal), teaser (documentary will be presented the 8th of November)
Release date : 24/09/2014
Club / structure : Alto Relevo Clube de Montanhismo