Area of scheduled 'annular spoil heaps' (Scheduled Ancient Monument 20949) "extremely well preserved earthworks , each approximately 3m high and 10m diameter and take the form of a thick collar of spoil and a wide central depression about 2m deep. . .clearly sunk in a planned grid pattern. . .believed to represent a single, well organised period of mining administered by a single landholder. . .within the Fitzwilliam estates, where the family of that name have exploited coal resources from the 17th century." Coherent group of well preserved mining remains. Group dates to between the 1855 and 1891 Ordnance surveys of this area. No legibility of earlier landscape types.