1880 Alston Lime Co. 1885-1920 William Benson 1921-1930 William Benson & Son Ltd
Bridge Mere Sike Level - 105m
Clarghyll - 228m
Ayle Burn - 444m
Ayle (1937) - 550m
Ayle Burn Mine Old Level - 738m
Ayle (1926) - 764m
Clargill - 862m
Clarghyll Drift - 885m
Taylor's Groove - 1,004m
Copperbole Head Levels - 1,518m
Thorngill - Slote Vein Firestone Level - 1,559m
Cooperhole Head - Level 2 - 1,597m
Thorngill - Slote Vein Level - 1,608m
Thorngill - Slote Vein Middle Level - 1,657m
Thorngill - Level below Firestone Sill - 1,713m
Bunkerhill Level - 1,820m
Coatleyhill - 1,844m
Slote Low Level - 1,855m
High Spency Croft Level - 1,885m
Fourdargue - 1,903m
Blagill Greenends Level - 1,915m
Blagill - Whimsey Shafts - 1,942m
Thorngill - 1,974m