Friday, August 18, 2017

Jewel Cave National Monument, Custer, SD


In 1900, two men discovered a hole about 14” in diameter with wind blowing from it.  They enlarged the hole and found a cave.  Thinking it would surely contain gold they quickly filed a claim.  They soon learned that the cave’s rock (calcite spar crystal) was a type that did not contain gold. This is the third largest cave in the world and spans more than 181 miles to date. Much has not yet been explored.  The guided tour takes you down 379 feet via elevator then you walk trails, stairs and catwalks to get back to a shorter elevator ride.  It’s 48 degrees inside so you want to dress warm and wear good shoes—they won’t let you in with flip flops!  It’s a good idea to reserve tickets ahead as they sell out on summer days. 
you can see the calcite in white and it's actually about 6-8 inches thick

water drips on the calcite causing the cones

catwalk inside

platform on the tour, there are lights throughout the cave

entry and visitor center in the background

map of the passages
bacon calcite creates a drapery effect, orange color is due to iron content

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