The cavern takes its name from the semi-precious mineral Blue John, which is still mined in small amounts outside the tourist season and made locally into jewellery. The deposit itself is about 250 million years old.
The miners who work the remaining seams are also the guides for underground public tours. The eight working seams are known as Twelve Vein, Old Dining Room, Bull Beef, New Dining Room, Five Vein, Organ Room, New Cavern and Landscape.
Source: Wikipedia.org
Copyright: Creative Commons 3.0
| | Public
High Peak, United Kingdom
Discover the most beautiful and popular trails in the area, carefully bundled into appropriate selections.
Source: Espresso_Addict
Copyright: Creative Commons 2.5
Discover the most beautiful and popular attractions in the area, carefully bundled in appropriate selections.
Source: Espresso_Addict
Copyright: Creative Commons 2.5
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