This is the Drainage Adit from Wheal Uny to the East. Little remains on the surface today in 2024 except a slow flow of water from the run-in adit portal (although it is possible that it has not been positively identified).

Dines:

Drainage adit leaves the western end of Adit Level, 90 fms. W. of Incline Shaft, and, driven 150 fms. N. by W., comes to surface by the stream 120 yds. S.S.W. of St. Uny’s Church; Adit Level east connects with the workings of Wheal Buckett’s. A crosscut 90 fms. N. and 30fms. S. leaves the 30- fm. Level at 8 fms. W. of Goodings’s Shaft.