A small group of earthworks that are likely to be the remains of post medieval coal working are visible as earthworks on lidar imagery. These comprise a mine shaft and a mound with access shafts, which may be the remains of bell pits. The mine shaft, which is depicted and labelled 'Old Coal Shaft' on the Ordnance Survey map of 1898 , is visible as a structure on post war air photos. These features are located on the slope down to the River Blyth from Briery Hill. (1-3)