A building on the Devon tungsten mine
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Devon tungsten mine work begins

9 June 2014 Last updated at 10:52 BST

Work has started to excavate Britain's first new metal mine for more than 40 years.

The Hemerdon mine will exploit the world's fourth-largest deposit of tungsten.

Geologist Richard Scrivener told the BBC's Simon Clemison about how it is mined.