From Metal Mines of Southern Wales by G W Hall; " A few yards from the bridge at Llandilo yr Ynys, on the south bank of the Towy, an adit enters under the road, and can be followed for about 120 paces to its intersection with a lode, which strikes roughly 10' west of north, and dips east. Here a winze has been sunk below the level, and some stoping done above. The adit continues beyond, but the partially collapsed state of the workings prevents full examination. just before the lode there is a short cross-cut north-west, the end of which is blocked with debris. This seems to be at the position of a shaft, indicated at surface by a small dump now enclosed in a hen-run. Further south, above the main road, are traces of another adit level, about on the line of strike of the lode. "
The scrub between the bridge and stream and beneath the houses on the south bank has recently been cleared, revealing the well built stone lined level that tracks off under the road and house. The more accurate grid ref is SN 4932120252