Batts Combe quarry
It has been operating since the early 20th century and is currently owned and operated by Singleton Birch Ltd. The output in 2005 was around 4,000 tonnes of limestone per day, one third of which was supplied to an on-site lime kiln, the remainder being sold as coated or dusted aggregates. The limestone at this site is close to 99% carbonate of calcium and magnesium (dolomite). In former years it was a major supplier of limestone for railway track ballast purposes.
A lime-burning kiln at the site was closed for a while in 2006 after testing showed quicklime dust was escaping into the atmosphere. The kiln, which produced 200,000 tonnes of quicklime a year for use in the steel industry, required £300,000 of investment to resolve the problems. The closure followed an earlier warning from the Environment Agency when the company was notified that it should tighten up procedures at the site. Quicklime dust is a health hazard, which in large quantities can cause skin irritation and damage to the eyes and throat. In March 2009 however the lime kiln closed, supposedly indefinitely, following a drop in demand from the site's sole customer, Corus.; the quarry has since been taken over by Melton Ross, Lincolnshire-based Singleton Birch.
There is some evidence of a Bronze Age field system at the site. Boxes were placed in Hanson woodland adjoining the company's Batts Combe quarry to encourage dormice to breed, and monitored with the help of pupils from Wells Cathedral School.
- Atthill, Robin (1976). Mendip: A new study. Newton Abbott: David & Charles. ISBN 0-7153-7297-1.
- "Quarry kiln closed over dust fears". Minerals UK. Retrieved 2007-02-11.
- "Jobs may go as kiln is closed". Cheddar Valley Gazette. 26 March 2009. Retrieved 29 March 2009.
- "Mendip Hills: An Archaeological Survey of the Area of Outstanding Natural Beauty" (PDF). Somerset County Council. Archived (PDF) from the original on 6 February 2007. Retrieved 2007-02-11.