Navigation Colliery closed in 1967 although the buildings remain as the best preserved colliery complex in south Wales. The exhibition design, built 1907 -1911 by Partridge Jones & Co is of unusual architectural quality of red brick with yellow brick pilasters. The complex includes two winding engine houses, a fan house, a magnificent chimney, a pumping house, stores and workshops, a heapstead, powder store and baths. Behind the buildings the steep incline of Mark Phillips' tramroad can be seen.

Claire Parry, RCAHMW, 28 June 2011.

Sources:
Collieries of Wales, RCAHMW
A Guide to the Industrial Archaeology of South East Wales, AIA, 2003