Underground celebrations
Ms Turner, whose family have run the cave for four generations, was also celebrating Treak Cliff's 75th anniversary as a show cave. Yesterday a party and cake-cutting ceremony took place.
Ms Turner said: "It's a very special year for us, and we want everyone to join in the fun."
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Hide AdBlue-John themed truffles have been created by Cocoadance, based at Mam Tor, and visitors will be able to sniff out the chocolates during underground truffle hunts on May 15 and September 25. Blue John mining tours, meanwhile, will be held on May 16 and September 26.
Picture: Chris Lawton.