Nails planted spiking out of the ground at Wheal Busy near Chacewater
A "VIGILANTE" is thought to be behind large nails set point-upward in the ground at a popular walking spot and World Heritage Site.
Dog-owner Mark Thomas, from Chacewater, said he thought the nails might have been planted at Wheal Busy to deter motocross riders.
"I was walking my dogs when I noticed a big nail in the ground and almost trod on it," he said. "Seeing how dangerous it was, I pulled it out and realised it had been placed there on purpose, directly in the path which is used by cyclists and motorcyclists."
He found a further ten nails, each approximately 8cm long, which he removed.
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"As I continued my walk I noticed the old calciner – a listed, important mining building – had been damaged," he said. "The bricks and stones were deliberately placed on the tracks, I presume to prevent motorcycling.
"This seems to be some reckless vigilante who's not thinking about the consequences of their actions. They have put many people and pets at risk and damaged a World Heritage Site building."
Jonathon Jones from the Tregothnan Estate, which owns the land, said: "We have made the police aware and any information that would help them would be much appreciated."
Tenants in the area had been made aware of the situation, he said. "Any security that can be tightened up has been, and we appreciate any other information as it comes to light."