Mynydd Llangynidr - Quarrying

Quarrying

A couple of major limestone quarries intrude upon the mountain. There is an active quarry at Trefil whilst that at Blaen Onneu in the northeast has not been worked since the 1980s. There are also a few small quarries for limestone which predate the larger workings. Some small scale mining of ironstone was also carried out near the head of Cwm Carneilw before the middle of the nineteenth century. There are a handful of small abandoned workings for sandstone in the Farewell Rock outcrop on the hill's eastern margin in the vicinity of the Beaufort Road.