Rock-crusher house and wheel-pit at Llywernog Mine

Rock-crusher house, rubble stone with restored upper floor and slate pyramid roof. Square-plan, built into steep bank. S front has C20 corrugated-iron and timber lean-to on ground floor and single 6-pane window under eaves above. The W side has a similar 6-pane window under eaves and a broad doorway below to right with timber lintel and iron rail tracks entering. The rear has a stone ramp down to a gabled doorway breaking eaves at first floor for bringing ore. Attached to right is large raised wheel-pit in rubble stone projecting forward with yellow-brick blank roundel in restored end wall, and brick-headed door in E side. Above these is a slate sill course, probably marking the top of the 1861 wheel-pit for the 40' (12.2m) wheel, raised some 1.5m in 1874-5 for the 50' (15.25m) wheel. On wall-top are cast-iron brackets for waterwheel. Deep pit.

Interior partially restored has beams supporting a mid to later C19 iron roll-crusher from the Llawrcwmbach mine resited within.