Dines, H.G. The Metalliferous Mining Region of South-West England, Vol. I, p.44, 452, 454-455.
Dines, H.G. The Metalliferous Mining Region of South-West England addenda and corrigenda, 1988, Vol. I p.xlv.
Hamilton Jenkin, A.K. Mines & Miners of Cornwall vol. ii p.36.
Mineral Statistics 1853, 1856-1857.
MJ 1870 p.7