I recently found that an ancestor, David Daniell, had moved from one part of Cornwall to another in about 1600. He went from the parish of Newlyn East to live in Zennor, a distance of about 40 km.
There could be many reasons for moving, but for the Cornish mining activities have played an important part in the movement of people around the county and out of the county. In the case of David the move could have had something to do with the development of copper mining in the West Penwith area.
Tin mining had been an important activity in Cornwall for many centuries, but in the sixteenth century attempts were made to mine other metals and by the 1580s copper mining was taking place in St Just in Penwith, not far from Zennor. In 1586 copper mining started in Zennor, and I suspect that this is what lured David Daniell to his new home.