Puzzled about **both** bride & groom's fathers' occupations given as "Butcher" on a 1894 marriage certificate when the 1891 census has them both as coal miners. (Northumberland & Durham)
Not impossible I know, to change your occupation, but both of them?? They weren't living in the same town & probably didn't even know each other, as the bride & groom both married out of their own parishes.

I understand a Buttocker was some kind of face worker down the mine.

Could Butcher be a corruption of Buttocker, or some other obsolete mining term? The Minister, who was Scottish, may not have been familiar with mining terminology & misheard them.