Lots of limestone mines, here is one:
Cults Limestone Mine NGR NO 3434 0853 Landranger Cupar, Fife
Four miles SSW of Cupar. The workings penetrate the shallow hillside beside a road SE from Pitlessie below Braes of Cults farm. An extensive underground system, with some roads bricked with steel girder roofs dating from the 1940s. The main workings have little sense of order, with rows of pillars departing from the straight due to a search for good rock. One or two roads still carry relics of steel ore buggies and rails and an assiduous search might well throw up other relics. Due to a police criminal search in the 1980s, passages near to the surface carry a bewildering array of coloured cords festooned around pillars with little apparent logic! Some tunnels are spacious, others less so and all run south east dipping eventually to flooded sections. In between are extensive pillar and room workings. Modern excavations are spacious enough to drive along (!) but older workings lie in the woods south of the quarry plant. An extensive series of complex passages are partially flooded. The water levels appear to rise and fall due to weather conditions.
see:
http://www.sat.dundee.ac.uk/~arb/scotland/mines_biblio.html for more details.
Cutting coal in my spare time.