River Ystwyth
The River Ystwyth is a river in the county of Ceredigion, Wales. The length of the main river is. Its catchment area covers. Its source is a number of streams that include the Afon Diliw, located on the west slopes of Plynlimon on the border of Ceredigion and Powys in the Cambrian Mountains. The Ystwyth flows westwards before its confluence with the Afon Rheidol and the estuary at Aberystwyth to drain into Cardigan Bay.
The Ystwyth valley is sparsely populated with villages: Ysbyty Ystwyth, Cwm Ystwyth, Pont-rhyd-y-groes, Llanilar and Llanfarian. In previous centuries, the valley was relatively densely populated due to its mineral wealth. Silver, lead and zinc have been mined in the valley since Roman times, an activity that reached its peak in the 18th century. The largest of the very many mines was Cwm Ystwyth Mine. It is reputed that the average age at death of the miners in Cwm Ystwyth was 32, largely because of acute lead poisoning. There is no active metal mining in the Ystwyth valley today.
The River still carries elevated levels of lead, zinc and silver in its water, mostly due to seepage from abandoned mine tailings and discharges from mine adits. At the Frongoch Mine near Pont-rhyd-y-groes, Natural Resources Wales has introduced a new technique for reducing the pollution. Water is drawn away from the mine in a leat to a wetland area, where biological processes involving the vegetation immobilise much of the pollutants. A similar approach is being used at Cwm Rheidol mine, near Aberystwyth. These remedies are considered important because the area supports a rich variety of wildlife, as well as bringing anglers and tourists to the area.
