These mines are located on the outskirts of the Lake District National Park, with numerous veins running through Skiddaw slate rather than limestone. Knockmurton mine was established in the 1850s, and its productivity surged following the installation of a rail connection to the main network. Shaft sinking at Kelton commenced in 1873, leading to significant tonnage extraction from these relatively remote mines, peaking at 61,000 tonnes in both 1882 and 1883. However, substantial mining activities ceased in 1913, with a minor re-working attempted in 1920. The veins tapered off in depth.

Notably, substantial amounts of kidney ore were found in lough holes, often accompanied by small quartz crystals.