There is some information on pages 206-210 of the Special Reports on the Mineral Resources of Great Britain, Vol. VIII - Iron Ores of West Cumberland, Mem. Geol Surv. 1924
The Kirkland Iron Ore Company of Whitehaven worked the Kelton, Knockmurton and Kirkland mines which were abandoned in March 1914. In 1923 the Kirkland Company proposed to sink a new shaft to the "north of the railway, east of the vein" (The Kelton No 1 Vein).
The name Bankstead does not appear in the Memoir but may refer to workings on the C-Vein and an un-named vein worked from the No 3 Pit 200m to the east of Cockan. (See map on page 207, op cit)