My Great Grandfather Ezekiel Harris Victor was born in St Cleer, Cornwall, England 3 Jan 1862. His father George Polkinghorne married Mary Polkinghorne.
The entire group were miners. When I visited Cornwall in 2003 I acquired a couple books with photos of old mining operations. I believe the tin and copper ran out in during the mid 1800s and many moved away.
Many of the email links on this site are old so I don't know if yours is still good but if you get this and contact me I can give you more info.