An amazing model of the mines at Geevor. It shows the underground workings in the area - the blue line (visible in the far distance) marks sea level - so only about 50 metres are above sea level - but these mines go 640 metres deep. They also extend 1.6km out under the ocean.   Indeed.  A rocky belt (I'm sure that's the technical term) at Geevor Tin Mines. 
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