Berw colliery was sunk in the early nineteenth century and is the best preserved of a number that once formed the Anglesey coalfield. It was established following the drainage of the Malltraeth Marsh (which began in the 1780s) and is known to have been extensively capitalised in the late 1840s, operating until it was flooded in the late 1860s.

The monument comprises the remains of several buildings and structures, including the engine house, a possible boiler house and a fine chimney stack. The site of the shaft itself lies close to these structural remains. The ruinous domestic and working ranges of a small farmstead are situated immediately adjacent to the colliery.
Source: Cadw scheduling description.
F. Foster, RCAHMW, 17/03/2005.