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Rocks and Metals



The Rock Cycle

Click to see a larger version of this imagediagram of the rock cycle

The Earth’s rocks do not stay the same forever. 

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The rock cycle: how rocks are formed

Click to see a larger version of this imagelarge rock with chimney in background

There are three main types of rock: igneous, metamorphic and sedimentary.

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What’s in a Lode?

Click to see a larger version of this imagediagram showing what is in a lode

Lodes are formed from Granite intrusions and their surrounding metamorphic rock.

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Rock types at Geevor

Click to see a larger version of this imagemap 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.

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Comment left by bluespice on 2010-02-21 16:43:01

nice huh!^_^

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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