Rhosydd Slate QuarryRhosydd Slate QuarryRhosydd Slate QuarryRhosydd Slate QuarryDinas Rock Silica Mine. the beginning of the flooded section. South Wales, UKWinch mechanism. Dinas Rock Silica Mine. South Wales, UKA caver explores railway tracks. An incline on the right descends deeper into the Dinas Rock Mine.Dinas Rock Silica Mine. the beginning of the flooded section. South Wales, UKDinas Rock Silica Mine. Large chamber supported by rock pillars. South Wales, UKCavers about the explore the Dinas Rock Silica Mine.Cwmorthin Slate Mine, north Wales, UKCwmorthin Slate Mine, north Wales, UKCwmorthin Slate MineCwmorthin Slate Mine, north Wales, UKCwmorthin Slate Mine, north Wales, UK