Warning over hidden collapsed mines on Dartmoor
Mine shafts up to 100ft (30m) deep have been weakened by severe weather and could collapse, Dartmoor National Park Authority has warned.
Head ranger Rob Steemson said: "We are aware of a few collapses this year and the sites are being regularly checked and monitored by the landowners."
Winter storms are thought to have damaged the wood and rubble used to cover the shafts.
02 May 2014
- From the section Devon