The Amaga, Angelopolis, Venecia and Bolombolo region, or the 'Sinifana Coal Basin' of Antioquia, is located on the western flank of the Central Cordillera ().The coal deposits are Tertiary in age and cover an area of about 350 km 2 (Muysquin Consultoria, 1985, Sedic and Serviminas, 1990).They occur in the Amaga Formation, which is approximately 1500 …