Steering back on topic :tongue: answer probably best if listed, so, to start (ignoring tourist mines and purely as sites where resource being physically extracted):
Milldam Fluorspar
Fauld Gypsum
Marbleagis/Silver Seal Gypsum
Barrow-on-Soar Gypsum
Kirby Thore Gypsum
Boulby Salt/Potash
Winsford Salt
Foss Baryte
Honister Slate
Hartham Park/Pickwick Freestone
Park Lane Freestone
Limpley Stoke Freestone
Westwood Freestone (technically active?)
Elm Park Freestone (possibly mothballed?)
Jordans Portland Stone
Bowers Portland Stone
Perryfields Portland Stone
Clearwell Iron Ochre/Pigment?
Collyweston Slate
Carrickfergus Salt
Cavanacaw Gold
...
Over-ground, underground, wombling free...