ordinary metal, it s tin, it s just what the modern world needs and cornwall has a lot of it. our mia del santos takes us there. reporter: cornwall s tin coast, rich in minerals and mines. an industrial legacy which could soon be reborn thanks to big tech and brexit. tin has been extracted from the rock and otherwise rural part of the uk for a millennium. in the late 1870s and these engine houses were originally built, cornwall has the world s biggest producer of tin, home to 2,000 mines dotted across its countryside. the last of those south crofty closed its doors two decades ago after tin prices plunged. but now it could be the first to reopen, creating 275 jobs. and that journey towards cornwall s mining revival begins