There are also Calcite mines at Menstrie, approximately NS854975. Two short adits, and two open cuts, if I remember correctly. One is maybe 200 feet above the other. But there may have been one more, possibly in a ****, for hard rock, likely roadstone. The lower one was behind a very nasty gorse bush, next time I will be equipped to deal with that.
I tried to get exact GPS fixes on these a while back, but GPS was dysfunctional that day, due to some military operation, and it put me somewhere in the Irish Sea.
The zig-zag roadway up the face of the Myreton Hill was built for those during the Napoleonic War, but it seems an enormous expense for not very many tons of calcite. I wonder why they needed it?
Alan