Mike,
There is at least one accessible mine not far from you, the limestone mine at Blochairn, possibly known as Blairskaith, NS590757. I have not been there for many years, but in view of where it is, I don't think that it can have been sealed or filled.
I don't know why it is not yet listed here, as it is quite well known.
It is below the road, in or adjacent to the waterfall.