Whickham, coal pits

In Hatfield's Survey (c.1382), under the heading of Whickham, there are four references to coal pits. Robert Hawyk had pits on 10 acres once held by Simon de Bassyngham; Cristiana Nikson pits on 11 acres once held by William Hering; Adam Punder pits on 8 acres called Collierland. All the tenants held 40 acres on the Crossmoor, described as a waste because of coal pits. It is not clear where these pits were.