Extent of the colliery and ancillary workings on 1893 maps including kilns, coke ovens and a clay pit. Some of the buildings within this polygon may have been housing for the miners. The first shafts at Houghton Main Colliery were sunk in 1873 and the colliery closed in late 1993 (Hill 2001, 115-118). The surface buildings were demolished and the area cleared of most evidence of mining leaving no legibility. Undeveloped land on 2003 aerial photographs but area looks to be under redevelopment.