Hi Dan,
I am afraid we are not getting anywhere with this one. Coram I have never heard. I know of no parish I can suggest to match that. Have you seen the original baptismal record? Here you say Coram yet I note on your Devon Lookup I see Croan was used as the residence.
The thing that springs to mind with that one is Crowan. (certainly plenty of tin miners about Crowan). I have worked on some of these in the past and a James and Grace spring to mind who had children baptised in Crowan under Barkle, Bartle and even Baskle around the same time your couple were in Devon. Looking back earlier in Crowan, there are plenty of marriages listed for different variants of Bartle, Bartell, Barkle, Barkell, so you may find records under all sorts of variants.
Cheers Kris
