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Quarrying in Guernsey - the major industry of 19th Century

Quarrying was the major industry in Guernsey in the 19^th century and at its height, 268 quarries were being worked, 178 of which were in the two northern parishes of St Sampson and Vale.  

The blue granite (Diorite) was expertly dressed by skilled craftsmen and it is thought that either Guernsey or Herm granite was used for the steps of St Paul’s Cathedral. 

Many quarrymen came to the island from Cornwall and between 1810 and 1841, the population of St Sampson parish more than doubled from 650 to 1,567.  

The granite was used mainly for road making in Britain and was crushed by hand in the early years on the island. Stone production peaked in 1910 when 458,000 tons were transported to Britain by Steamer. The ships returned laden with red bricks from the London Brick Company and this led to the demise of brick production at Oatlands. However they turned their skills to the production of clay pots for the fledgling tomato industry. The ancient kilns still remain on the site. 

With the introduction of asphalt for road making, crushed granite was no longer required and exports ceased in 1967. A total of 4,147,975 tons of granite was exported to Britain. The only working quarry in Guernsey is at Les Vardes run by Ronez who continue to supply stone to the local building industry and skilled stonemasons remain a key part of the industry. The island’s coastal defences and harbours are built from massive granite blocks all of which had to be placed manually using pulleys and winches.  

The quarries several hundred feet deep have since proven useful in the 20^th and 21^st centuries as water reservoirs and for waste disposal. 

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