Carrock Fell Mine was the only British Tungsten mine outside Cornwall and was operated at various times between 1850 and 1982 when the price of Tungsten was sufficient. Although reserves of Wolframite and other tungsten ores are believed to remain, the Harding vein beneath Knott has long been worked out and the levels were used for dumping sludge from ore processing operations. A small operation on the southern flank of Knott was Little Wiley Gill Mine. A 40-yard level was driven here, but no other information survives. From Orthwaite to the north-west a track can be followed to the source of Hause Gill and the col between Knott and Great Calva. Alternatively a start can be made at Longlands, crossing the intervening ridge between Meal Fell and Great Cockup and then following a path up between Burn Tod and Frozen Fell. Fell Side provides access from the north, along the old mine track beside Roughten Gill. Once the mine is reached a pathless climb can be made to the summit. The access road to Carrock Fell Mine can be used to lead onto Coomb Height for an ascent from Mosedale. Wainwright gave dire warnings regarding the mine workings on this route.