Trial.

According to Alun John Richards:

Two run in levels.

According to Tony Jarrat:

At the head of the river [Oernant] were several very old lead levels and a couple of shafts. Three of the levels were blocked/flooded and needed digging out and a fourth appears to close down some 25’ in. The shafts are blocked. These are almost certainly the site of the “Salopian Adventurers” workings.