It isn't any more. Two shafts, Chappel's and Pim's, were capped off (i believe privately), some years ago. A bad move on behalf of the person doing the capping as there were bats using the stopes, much as they do in Uny at present. We pushed the adit towards Buckett's Shaft, but did not reach it. I pushed on without a helmet and untill there was only 6" of airspace where I could see ahead that the water was up to the roof.
We did however log one unknown shaft close to Chappel's which linked an above adit drive to Pim's Shaft. This certainly would have served as a ventilation shaft and possibly for bringing ore to grass.
A section of the drive from Chappel's has that wonderful Coffin shape suggesting that it was worked at a shallow depth probably at the end of the 17th Century.
whilst on the subject; the sketch map that Morrison gives in Cornwalls Central Mines (Southern District), page 409, places Chappel's Shaft too far south. In fact it should be more or less due east of Joseph's on Wheal Uny sett. In all honesty, the positions of ALL the shafts on this sketch map are dubious with some names having been transposed for their near neighbours.
I'll see if I can upload a few more. 🙂
"You Chinese think of everything!"
"But I''m not Chinese!"
"Then you must have forgotten something!"