Public access to the former Snaefell Mines site has been closed as a safety precaution following the collapse of a retaining wall last month.
The site is accessed from Agneash or via Black Hut and is popular amongst walkers.
DEFA confirmed the decision after an urgent inspection revealed significant risks, including unstable masonry, weakened walls, and eroded footpaths.
Clare Barber Minister for Environment, Food and Agriculture, said: “The site must be placed off limits as the collapse has compromised the stability of key areas and poses a significant risk to public safety.”
Secured
Established in 1856, the Snaefell Mines were part of the Great Laxey Mining Company’s operations, extracting lead and other minerals at depths exceeding 1,100 feet before closing in the early 20th century.
The site was briefly reopened in the 1950s for reprocessing spoil before being abandoned.
Accessible via a byway from Agneash and a footpath from Clagh Ouyr, the area is now being secured ahead of TT visitors.
Minister Barber added: “All access is being restricted, with signage and diversions installed ahead of the TT to prevent spectators from entering hazardous areas.”
Though the affected path is not a Public Right of Way (PROW), a diversion is in place.
Long-term access depends on securing funding for repairs, potentially requiring a Treasury bid.
Without investment, the site may remain closed permanently.
A detailed report on the risks and closure will be published soon.
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