Legal experts are urging anyone who is receiving letters about claiming mineral rights under their properties to take legal advice.
Homeowners in Carlisle are among people from all over the UK to get the notices. Richard Miller from Burnett's is one of several solicitors dealing with queries.
For more information and advice on the issue of mineral rights, visit the Land Registry website here.
More top news
A look ahead at the forecast for the Border region.
Immigration, extremism, Europe and tax cuts: The key promises unveiled in the first Tory-only Queen's Speech in almost two decades.
Fiona Marley Paterson's latest report into Cumbria Tourism's plan to make the Lake District the Adventure Capital of the UK by 2018.