Gaunless Lead Mill AKA Smelt Mill & Chimney, Copley (Copley) - Source of Reference
| No. | Originator(s) | Date | Title | Notes |
|---|---|---|---|---|
| 1 | Department of Environment, English Heritage, Historic Buildings and Monuments Commission | 1950 | List of buildings of special architectural or historic interest, also known as "Greenbacks" | LB Volume, Map & Item: 1400, 8, 49 |
| 2 | Ordnance Survey | 1856 to 1865 | First Edition Ordnance Survey Map | 6", Durham 41, 1859 |
| 3 | Ordnance Survey | 1894 to 1899 | Second Edition Ordnance Survey Map | 6", Durham 41 SW, 1898 |
| 4 | T W I M T | 1980 | Lead Working Sites in County Durham Recommended for Protection (TWIMT/T.W.I.M.T.) | |
| 5 | English Heritage | 1992 | Monuments Protection Programme (MPP) The Lead Industry: Step 3 Reports | Vol.2, Durham 7, 1992 |
| 6 | Durham County Council | Landscape view of Smelt Mill Chimney, Copley | ||
| 7 | Smelt Mill Chimney | |||
| 8 | Smelt Mill Chimney | |||
| 9 | Smelt Mill Chimney |