Subsequently considerable parts of the gorge have also been protected for their wildlife and habitats including the Cwm Clydach SSSI, Cwm Clydach National Nature Reserve, the Cwm Clydach Woodlands SAC and the Usk Bat Sites SAC which also extends across much of the neighbouring Mynydd Llangatwg.
The rock was removed by means of a series of tramroads or tramways which linked north via steep inclines to a wharf on the Monmouthshire and Brecon Canal at Llangattock and south to Brynmawr and the ironworks at Nant-y-glo by two tramroads which contoured the eastern end of the hill.
Mynydd Machen | Mynydd Llangatwg | Mynydd Hiraethog | Mynydd Carningli | Battle of Mynydd Carn |