Re Oliver Wethered. I am sure I have seen an Obit. for him somewhere. You
have probably tried the West Briton already? If not maybe the MJ might oblige.
He was obviously a very notable Cornish mining man of very long standing
(Dolcoath & others), and I am certain there's something somewhere - but I can't
remember at the moment!
Sorry I can't be of more help... at the moment anyway!