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What's in a Lode?

Granite

Killas

Cornish Geology

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Rock types at Geevor

map showing granite and killas areas in cornwall.

The Cornish landscape is made mostly of mudstones and slates, known locally as ‘killas’, and granite, which usually forms the higher ground.

Geevor is situated where the granite and killas meet or ‘contact’. Most of the valuable metals and minerals found in Cornwall are near to a granite-killas contact.

 

Photograph reproduced with the kind permission of the Geevor Archive

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Comment left by Gary Parrott (es Stoper) on 2012-05-04 18:37:02

Kilas lies just off the coast at Geevor and is far easier to drill than granite, it also takes less explosive to break as it's very brittle. I was stoping on 18 Treglowns in 89-90 and we were just coming out of the granite and into the Kilas. Tin in Kilas equals big money to a stoper as far more ground can be broken per shift and the drills stay sharper longer.

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