Gorseddau Slate Quarry (NPRN 40557) was first opened in 1807, but its main period of working was between 1854 and 1857, when it was developed by the Bavarian mining engineer Henry Tobias Tschudy von Ulster. The visible remains include tiered workings and spoil tips set into a SW-facing hillside. It includes the remains of an incline, several ruined structures and a workers' village.
A blast shelter on top of a spoil tip (NPRN 532566), the external dimensions 2.5m N-S x 2.3m E-W and 1.6m high. Constructed of dry-built slate blocks under a corbelled roof, with entrance to S end. Internally, it measures 1.9m long and 0.6m wide. There are collapsed walls to the R and rear of the structure.
Recorded as part of RCAHMW Uplands Initiative Project, W B Horton, H & H, 08/03/2013.