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Mines in the sky |
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| Authors: | CLIVE OPPENHEIMER |
| Institution: | Clive Oppenheimer is at the Department of Earth Sciences, The Open University, Milton Keynes. |
| Abstract: | The highest working mines in the world extract bright yellow deposits of sulphur from the peaks of towering volcanoes in the Central Andes. Workers and machinery must cope with the extreme environment at up to 6000 metres above sea level. |
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