I think MountainPenguin has probably got it, but I'll give them some time to offer a name.
In the meantime, a bit of puffing from the past
In the share prospectus in June 1839 the mines were described:-
“These mines are situated to the west of Parys Mountain and are well known … as a sett of great importance, and estimate them to be of no less value that the celebrated Parys mine which has realised millions to it’s noble proprietors."
Nice to see that the grocer's apostrophe was going strong even then.