Allison, W., 2010. Discoveries at Silver Gill Mine, Caldbeck 50 Years of Mining History Proceedings of the NMRS 50-year Anniversary Conference, Reeth, 1-3 October 2010. British Mining No.90. Northern Mines Research Society, p.90-91.
Smith, R., and Murphy, S., 2011. Mines of the West Pennines. British Mining No.91. Monograph of the Northern Mines Research Society, p.162.