Rhosydd is in the Moelwyns just to the west of Blaenau Ffestiniog, famous for its slate quarries / mines. The area in which Rhosydd is situated also contains a number of other mines of, namely Wrysgan, Croesor, Pant Mawr, and numerous other scratchings, only noticeable by walking the hills. Most of these mines are all in the same veins of slate, known in Blaenau as the Old Vein and Back Vein. There are also other veins such as the narrow vein, but these were not as effective for producing slate.
There were three inclines at this mine, remains of a winding house and one of the inclines can still be found, one of the other inclines is inside the mine.