The Harlech Dome is a geological dome in southern Snowdonia in north Wales. It extends approximately from Blaenau Ffestiniog in the north to Tywyn in the south, and includes Harlech, The Rhinogydd, [1] Barmouth and Cadair Idris. [2]
The geological layer structure comprises Cambrian sedimentary, volcanic and intrusive rocks from the lower Paleozoic age [2] approximately 4.5 km thick. [3] The geology contains the Harlech Grits Group, Mawddach Group, Rhobell Volcanic Group and Aran Volcanic Group. [2]
The area contains a wide range of metallic minerals and has been mined for ( copper, [4] silver, [4] zinc, [4] manganese, [5] gold [4] [6] [7]) in the past. [2]
52°52′N 3°55′W / 52.86°N 3.91°W