Looking out from the top of Black Rocks again, it's not quite so pretty the other way. However, as I've said before, locals can't live on fresh air.
This is Dene Quarry, owned and managed by Tarmac Ltd. It is a limestone quarry, producing crushed rock aggregates for roads and concrete. It was opened in 1942 and, originally, provided rock for the facings of many significant buildings, including the Royal Festival Hall in London. Then, in 1966, the quarry turned to aggregates to provide crushed limestone for the construction of the M1 motorway.
More recently, stone from Dene has been used in the linings of the Channel Tunnel, so a part of the age old sea bed of Derbyshire has once again returned to being under the sea.
When workings eventually cease here, the area will be restored and landscaped back into its surroundings.