SN 971 809 (Mine) SN 963 807 (trials)
On the roadside (B4518) from Llanidloes to Tylwch (just north of Tylwch) and marked as “levels” on the O/S Map. The trials are one the opposite side of the hill almost directly West and also marked “levels”. It is easier to go across the top of the hill from the East side rather than walk around the base of the hill on the West side as the trials are near the top and the hill is both tall and very steep.
Landowner permission only (I have the landowners contact details)
The Trials cannot (in theory) flood as they are single adits and have only the usual ankle depth water at their entrances. The main mine entrance (by the roadside) has water to a depth of 2 feet. Flood risk is therefore unknown
The main mine is apparently on six levels but, sadly, the two entrance adits are both collapsed. One adit is around 150 feet long before a collapse and the other is collapsed at the entrance (they sit next to each other for some reason).
The landowner states that cavers (ok, mine explorers) entered 8 years ago and it was not then collapsed where they reported it picked up a railway line and entered chambers.
There is a shaft on the hillside above the adits which is around 100 feet in depth but looks much more like a vein to surface when approached. The floor of the passage could easily be seen below (no water) but I had no SRT equipment to descend. Several nearby trees would make excellent anchor points.
All of them.
The landowner intends to dig out the mine entrance to gain entry sometime during 2011.