This is the site of the No.9 Drift at Cae'r Defaid Colliery shown on the 1877 1:2500 Ordnance Survey map. This drift was opened in 1863 by John Brogden and Sons and closed in 1908. The level entrance is now filled in with earth, behind which a concrete block wall can just be seen. It is likely that the level remains intact behind that wall and there is no evidence of collapse. A modern plastic drainage pipe emerges from the bottom of the level, from where a drainage channel runs westwards. This water is clean and supplies nearby Cwrt y Mwnws farm. J.J. Hall, Trysor, 28th May 2011