Dartmoor tin mining
The tin mining industry on Dartmoor, Devon, England, is thought to have originated in pre-Roman times, and continued right through to the 20th century, when the last commercially worked mine (Golden Dagger Mine) closed in November 1930 (though it saw work during the Second World War), and "composite mines" such as those producing tin as a by- product, such as Hemerdon Mine in Plympton continue to operate today. From the 12th century onwards tin mining was regulated by a stannary parliament which had its own laws.