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The former Wrysgan Slate Quarry in the Moelwyn Mountains, by Tanygrisiau, Blaenau Ffestiniog, Gwynedd, North Wales. Wrysgan sits high on the flank of Moel-yr-hydd, to the south of Cwm Orthin. It was separated from Cwm Ystradau by a sharp ridge, through which the quarry bored an inclined tunnel in order to connect to the Festiniog Railway. On the north side of the tunnel a tramway led to the mill and stacking area, which stood on a small area of flat ground high above Cwm Orthin. To the south of the mill an incline led up to the main floor 3 adit which led west into the chambers underneath Moel-yr-hydd. Further adits lay to the south, accessing other levels. The first slate was worked at Wrysgan in the 1830s. In the 1850s the quarry underwent a substantial expansion, including the construction of a mill on the site. This mill was replaced with a larger facility in 1865 which was powered by a waterwheel supplied from the LLyn Wrysgan reservoir above. Electricity was introduced in 1920. The quarry closed and the incline was lifted in 1946.