A small area of Grassington Grit coal was worked from at least 25 shafts at Wetshaw Bottom, near Surrender. A map produced in 1675 for a boundary dispute between Lord Wharton and Charles Bathurst, as owners of Swaledale and Arkgengarthdale, respectively shows a “cole pit in the Wet Shaw wrought for the Lord Wharton”. Most of the pits probably date from the 18th century, but in 1826, Mr Urwin was tenant at Wetshaw Pit.
Gill, M.C. “Great Dales Coalfield, Eastern Areas” British Mining No.86 (2008), pp.68-108
NYCC Record Office, ZQH 7/1/14 Sketch map of Swaledale and Arkgengarthdale boundary