Geology & Mining in Cornwall


Zig zag folding, Millook Haven, North Cornwall

Zig zag folding, Millook Haven, North Cornwall

The geology of Cornwall provides a wealth of variation from the oldest rocks of the Lizard peninsula which could date from as far back as the Pre-Cambrian period over 600 million years ago to Cornwall's most recent geology of the Late Tertiary and Quaternary periods up to 70 million years ago.

Much of Cornwall's geology belongs to two well known periods: Devonian, the rocks being described locally as 'killas' and over 400 million years old; and from the Carboniferous period 350 million years ago.

Even the oldest rocks of the Lizard have undergone metamorphic transition over their lifetime, with the intrusion of igneous rocks. The famous serpentine stone in its green and red varieties has found its way across the world, taken as a lighthouse or ornament, a momento or souvenir from a visit to the Lizard peninsula.

Cornwall's scenery is characterised by its geology, particularly its granite, which shapes its uplands and moors. The Land's End peninsula consists entirely of granite which gives it its unique appeal, rocky cliffs carved into pillars and blocks by time, inland moors with carns and craggy peaks and one of Cornwall's most popular rock climbing areas, Bosigran.

Extending along the central spine of Cornwall these granite bosses extend from the Land's End to Tregonning, Carnmenellis, Redruth and Carn Brea, Helman Tor and the Luxulyan area of Central Cornwall to Bodmin Moor in the north with another small granite intrusion in south east Cornwall at Gunnislake and Kit Hill.

Some fossils can be found in Cornwall in the metamorphic and sedimentary rocks from the Devonian and Carboniferous seas. Bude, Padstow, Trevose Head and Trevone are some of the best areas of North Cornwall for discovering fossils including brachiopods, sea lilies and bryozoa.
 

Raised beach, Porth Nanven, near St Just in Penwith


The north coast of Cornwall provides many fascinating geological sites including: the visually stunning Millook Haven with its sandstones and shales folded in an amazing zig-zag formation; Lanterdan Quarry near Trebarwith with its towering slate pillars; the raised beach at Porth Nanven on the Land's End peninsula; St Agnes Beacon, once an island; Cligga Head, near Perranporth, a granite outcrop with exposed greisen veins; and the Rocky Valley, a gorge near Tintagel.

Cornwall's south coast offers more geological sites, different in nature but equally spectacular including: the stretch of coastline from Land's End to Gwennap Head with its amazing granite formations; the Logan Rock, near Treen, a 65 tonne granite boulder which 'logged' or rocked when pushed by the hand of a single person; the Loe Bar, near Helston; the Devil's Frying Pan near Cadgwith; the Fal estuary, a ria and one of the largest natural harbours in the world; and the raised beach at Carne on Gerrans Bay.
 

Cheesewring, Stowe's Hill, Minions, Bodmin Moor


Central Cornwall boasts one of the strangest sites, Roche Rock, an outcrop of rock rising from an otherwise normal area crowned by the ruins of a 15th century chapel. The view is quite unexpected and is well worth a visit. Bodmin Moor offers some fascinating sites of the so called 'Cheesewrings'. The best is on Stowe's Hill, a short walk from the village of Minions on the east of Bodmin Moor.
 


Cornwall's wealth of geology resulted in a rich mineralogical history, which was the mainstay of Cornwall's industry for several centuries. The picturesque stone engine houses and chimneys which are scattered across Cornwall's landscape are a reminder of this industrial activity and are now recognised as a World Heritage Site of international importance. Today, these stone monuments to a bygone age are appreciated by visitors and residents alike, who study and preserve them and the minerals and techniques associated with this industry.

Loe Bar, near Porthleven and Helston


Mineralogists will find a fine collection of Cornish minerals extracted from  mines around Cornwall housed in the Royal Institution of Cornwall Museum in Truro, including: cassiterite (tin oxide); chalcopyrite (copper and iron sulphide); chalcocite (copper sulphide); galena (lead sulphide); native copper (pure copper metal in flattened leaflike sheets); cuprite (red copper oxide); haematite (iron oxide); zinc blende (zinc sulphide); wolframite; iron pyrite; siderite (iron carbonate); malachite; bournonite; and cerussite (lead carbonate).

The economy of Cornwall depended for many years on the mining of tin, copper, lead, zinc, manganese, iron, wolfram, silver, antimony and uranium.

The main mining areas of Cornwall were: St Just in Penwith, Botallack, Pendeen on the Land's End peninsula; mines around Mount's Bay; Breage and Helston; St Ives area; Camborne, Redruth, Gwennap, Chacewater, St Day; St Agnes and Perranporth; Callington, Gunnislake and East Cornwall.

Central Cornwall, around the St Austell area, is still famous for the production of kaolin or china clay used in the ceramic industry and in paper. Huge open cast pits can be seen, some of which have now been reclaimed and the snow white towering pyramids of this area are known by locals as the 'Cornish Alps'.

Mining in Cornwall and the sites associated with it have been recognised as internationally important and awarded the status of being a World Heritage Site. The World Heritage Site encompasses mining landscapes dating from 1700 to 1914, when deep hard-rock mining was developed in Cornwall and when major developments in technology within Cornwall helped to transform mining both locally and worldwide.

The ten areas which are included in the World Heritage Site, chosen for where the physical remains of mining from this period are best represented include: St Just in Penwith; Hayle; St Day/Gwennap; Camborne/Redruth; Godolphin/Tregonning; Wendron; St Agnes; Caradon; Luxulyan Valley and Charlestown; Tamar Valley and Tavistock.

Wheal Coates, Chapel Porth, St Agnes


Other economic geology still being carried on in Cornwall is the quarrying of certain types of stone. In Delabole, in North Cornwall, slate is quarried from a huge open pit just outside the village. The quarry is a fantastic sight at over 500 ft deep and has been in production since the 1200s.

Granite is still quarried at De Lank near St Breward on Bodmin Moor.

 For more information about individual sites, visit our A-Z of Cornwall, where you will find information in our index of town and individual site pages.
 





Books:

Mining in Cornwall

Geology of Cornwall




Websites:

geologycornwall.com




Geology & Mining events

      


Map of Geology & Mining locations in Cornwall

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Geology & Mining locations in Cornwall

 

 




 

Geology & Mining in Cornish

Geology & Mining
Dororieth & Balweyth

Tin
Sten

Copper
Kober

Miner
Den bal

 

 

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Engine Houses and Mining Heritage in Cornwall
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Fal Estuary, Ria, Falmouth
Fal Estuary, Ria, Falmouth


Roche Rock, Quartz Schorl
Roche Rock, Quartz Schorl

 

Cape Cornwall, Land's End Peninsula
Cape Cornwall, Land's End Peninsula

 

Chimney, Levant, Land's End peninsula
Chimney, Levant, Land's End peninsula

 

Wheal Coates, Chapel Porth, St Agnes
Wheal Coates, Chapel Porth, St Agnes

 

Levant, Land's End peninsula
Levant, Land's End peninsula

 

Things to do
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Waterskiing

 

Maps of Cornwall :

The Ordnance Survey publishes the Explorer series of maps which are ideal for walkers.

Scale 1 : 25 000
2.5 inches to 1 mile /
4cm to 1km.

Available in local bookshops or click on the links below to order online.

Those covering Cornwall:

Map of Isles of Scilly:

101 Isles of Scilly

 

For more information: www.ordnancesurvey.co.uk


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