Stora Stöten was formed by a sudden collapse at the Falu copper mine in 1687. This catastrophic event, caused by intense mining and reckless extraction of ore, surprisingly left no casualties because it occurred on Midsummer Day when all miners were off work.
The hole is now 300 - 400 meters in diameter and barely 100 meters deep. It is known as Stora Stöten or Falu gruva.
Stora Stöten is depicted on a stamp in the I Dalom series from 1973.
Sources: Wikipedia, OpenStreetMap, Wikidata, Wikimedia Commons
Written by Nik Frost
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