Sandford Hill is on the western edge of the Mendips and holds the remains of several lead mines which also intercept some natural caverns. A number of the mines are entered from shafts on the top of the hill but Sandford Levvy is entered through a horizontal adit.
It appears to an exploratory excavation and penetrates 450 metres south into the hillside. There are a number of cross passages roughly at right angle to the main entrance passage. A small area is paved and is the location of a World War II Auxiliary Patrol Unit.
There are a number of upward excavations and recent exploration has extended the known extremities of the mine. It is believed there are underground connections with some of the higher mines but these have not yet been discovered. Despite this some passages have been explored which have been isolated for perhaps 200 years.