MINING

Mines in the parish

Quarries >>
A - Trebartha-Lemarne Mixed Mine
(SX256777)
B - Luskey Copper Mine
(SX261769)
C - Berriow Mixed Mine - this has been erroneously recorded as the Caradon & Phoenix Consoles Mixed Mine
(SX271758)
D - Hawkswood Mixed Mine
(SX269756)




E - Kingbear Mixed Mine
(SX270750)
F - Wheal Rodd Mine
(SX286752)
G - Great Rodd Mixed Mine
(SX287752)
H - Tremollet Mixed Mine
(SX297758)




J – Wheal Lanoy
(SX301784)

Why are there minerals in our parish?

300 million years ago a mass of molten rock pushed up from below the Earth’s crust, underneath what is now South West England. You can imagine the animation below is looking westwards from Dartmoor in the foreground to Bodmin Moor in the distance. You will see the molten rock break into the crust, cool down and suffer erosion to expose the granite uplands we see today. The animation looks into the future when the surface has been further eroded to show the single mass of granite (a batholith) that extends from Dartmoor and onto Bodmin Moor; from there it ranges down through the county to Land’s End and beyond.



Reproduced from https://projects.exeter.ac.uk/geomincentre/batholith.htm

The minerals contained in the molten rocks and the surrounding rocks existed in a fluid state and seeped into veins and cracks in the rocks around the edge of the granite mass where they cooled into solid ores. As different minerals solidify at different temperatures the minerals of copper, lead, tin, wolfram and others can generally be found in discrete lodes. North Hill is in the area on the edge of the granite mass of Bodmin Moor where mineral cooling took place in the veins and cracks in the rocks and mines have been driven into the Earth to extract the precious ores.

Local Geology

The dominant geological feature of the parish is the granite eastern flank of Bodmin Moor. This is a pluton, being part of the great batholith that intruded into the earlier Devonian rocks as shown above. Some molten lava made its way to the surface and now form the higher hills in the north and east of the parish. Close to edge of the molten rocks the existing sedimentary rocks were metamorphosed under great heat and pressure into slates and other rocks.

Click on this iamge to see a larger version of the map with more details of the formations.
Click to read more.

Trebartha-Lemarne Mixed Mine

From Venning’s Postal Directory of 1901:
“Trebartha-Lemarne Tin Mine is situate on the Trebartha Estate very near to the mansion of F R Rodd Esq. and is worked at present by water power, and very recently a large outlay has been made in erecting works for separating tin, arsenic and other minerals. It has been worked by a local company for 7 years, Mr J B James of Plymouth is the Purser, and Capt H Bennett of Redmoor [is] the Manager. The mine has a remarkable ancient history.”

The banner image shows a cross section through the Trebartha-Lemarne Mine and Arthur Borlase, one time worker at Hawks Wood Mine who has recounted his memories in two parts - one and two.