A quarry that produces a "unique" red stone from the edge of Northumberland National Park is set to expand.
Harden Quarry, near Rothbury, known locally as Biddlestone Quarry, has been operating since the 1940s and is the only quarry in the UK that produces red felsite.
The specialist material was used locally at Cragside, as well as in the grounds of Buckingham Palace and on The Mall in London. A large amount of the stone is also exported to mainland Europe where it is used to build specialist cycle lanes.
