• Wheal Martyn China Clay
• 
  

• Slate Mining In Cornwall

http://www.cornwall-calling.co.uk/mines/slate/slate-mining-cornwall.htm

• 
• Delabole Slate Quarry, Cornwall

The north Cornwall village of Delabole grew up around the famous slate quarry. Delabole slate has been mined in the area since the Medieval Times and has probably been in existence for some 1000 years. Whilst little is known of the early period, much evidence shows it has been commercially operated for the last six centuries. Today a village has grown up around the industry. The quarry itself is about half a mile long and a quarter of a mile across. The quarry is around 400 feet deep

http://www.cornwall-calling.co.uk/mines/slate/delabole.htm