Parts of this area were worked for copper by the Romans and they may even date from as early as the Bronze Age. Working continued intermittently for lead and zinc until the 19th century, so this must be the longest worked site in the area.
The entrance to the Ogof is relatively wide but the passages inside soon become narrow and winding, apart from a chamber at the bottom of the fenced shaft. Although there are some natural sections, most of the passages have been mined. The Ogof is the oldest working and artifacts, coins and bones have been found inside over the years.
To the north is an open 19th century adit which leads to the bottom of earlier stope workings. South-west are some smaller workings which are very difficult to find.