Main Quarry, Mountsorrel

Main Quarry or Castle Hill Quarry is a 14.7 ha geological Site of Special Scientific Interest in Mountsorrel in Leicestershire. It is a Geological Conservation Review site.

According to Natural England, this site "is probably the most dramatic and well-developed occurrence of asphaltite in Britain upon which international research into the origin of life on Earth has been carried out."

The site is private land with no public access.