1760-1782 Mr Thornhill & Co. 1782-1790 Peter Wilson Overend 1802-1823 H. Hardcastle & Co. 1824-1855 Thomas Hopper & Co. = Sunside Mining Co.
Publications (2)
- Gill, M.C. & Burt, R.; NMRS (2003); British Mining 72 - Mines of Yorkshire, The; ISBN 0901450 56 1; pp.121,169,360.
- NMRS; Memoirs 1967; pp.12,14-15.




