Lead Company started to drive the Whitesike Level around 1770 along the
Thortergill Cross Vein below the Great Limestone. The level eventually reached
the Browngill Vein and then was driven east following the Browngill Vein right
up to the Longholehead Whimsey which was reached around 1820. The Longholehead
Whimsey connected Whitesike Level with Caplecleugh Horse Level. The Browngill
Vein did not yield a great amount of ore. From the extent of surface shaft
workings prior to the London Lead Company, it is possible that much of the ore
had been already worked out.
Further developments of the level occurred
when the Vieille Montagne Lead and Zinc Company took over the leases in the
early 1900's. Two new major connections between Whitesike and Caplecleugh
Levels were serviced by the Whimsey upon the Flatt Shaft (attained in early
1916) and via Caplecleugh Shaft / Foremost Rise. A further four rises were
driven between the two levels from 1919 to the early 1920's.