Home Things to do Castleton Blue John Mine Blue John Mine Blue John is Britain’s rarest mineral first discovered in Castleton by the Romans. This cavern has natural chambers as well as a working mine. Blue John Mine is a must-see to believe the beauty of it. We Cater for Corporate Large Groups Corporate Golf Venue Main Menu Home Accommodation Rooms 16 Rooms 1-6 & 13-15 Rooms 7 -12 Gallery Things to do Tideswell School of Food Butterfly House Steep & Deep Heights of Abraham Hathersage Hathersage Outdoor Swimming Pool Castleton Blue John Mine Peak Cavern Speedwell Cavern Derwent Reservoir Derwent Cycle Hire Derwent Dams Sickleholme Golf Club Chatsworth Bakewell Dolomite Training High Peak Garden Centre Other Venues Thornbridge Manor Peak Venues Thornbridge Cottage Contact Us Follow us on Twitter Facebook Trip Advisor