Portal of drainage tunnel, early Cl9. Squared stone. Elliptical-arched entrance in wall with flat coping, opens into arched chamber c.2 metres square, with 2 arched drainage adits leading off.
Publications (1)
- (1923); BGS - Mineral Resources of GB (c1920s) Vol XXV - Lead & Zinc: Northumberland and Alston Moor; 128 pages