Pori'r archifau

XS/1072/228

A Quarry engine pulling a truck load of slate at the tunnel entrance at the foot of one of the older workings at Dinorwic Quarries, Llanberis. The photograph illustrates the problems of development in the older type of quarry. The slate is hauled over a network of more than 80 miles of internal railway system and lowered by winch and incline more than 2000 feet to the workshops below. A rock fall seen in the picture was caused by over-burden pressure outward hanging strata and too narrow galleries - a contrast with the wide galleries and mechanisation at Marchlyn quarry (see dorse of photograph).