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Its likely but without having details from their marriage its still not definite.
You could try emailing the Durham Registrars and asking if they would check the record and confirm/ deny that the groom was a lead miner and his father was called William.
Some registrars will reply, some just tell you how to buy the cert to find out, but Shy Bairns get Nowt so its worth asking.
NB if they do reply, they will only tell you if its a match or not, they wont tell you any new info.

Boo

It can be useful to look at the Durham County Council Indexes for marriages as they can confirm a previous marriage and likely maiden name. See link below:

https://gro.durham.gov.uk/Person/1856654/0/4

Try looking for Walter Copping born 1913 in the 1939 register and you'll find Hannah

The Canadian Census years were 1911, 1921 and 1931.
There is a Canadian Prairie census of 1916 for Saskatchewan, Manitoba and Alberta.
Mona was in Ontario so no other document available online.

Did try and investigate the St Clair part of her name in relations to those families but sadly drew a blank. 

Sandra

Thank you.

Unless there is a marriage record for Jack Mason to Eleanor Laing, someone probably wrote or heard the wrong name. Have you seen an actual marriage record showing those names ?
If you have can you give a link or post a copy please.

There is already a discrepancy over the fathers name on Alma's marriage document !!

The maiden name of the mother of Alma was wrong on her death certificate, should be Margaret and they put May Laing !!!
 
The mother in law details were put on the death certificate for Mona when it asks for the maiden name of her mother !!

I wonder if John and Alma ever got divorced. It was so expensive then, sometimes people didn't bother 
Someone else probably filled in the information on the 1940/50 census forms !!

Other petitions, declarations etc say John Mason was not married which seems correct.

The family of Harry William Springett don't even mention Alma as his wife in his obituary, they only mention the late Isabella !! Strange !!

So as I said before, "Never believe everything you read on census or other documents,  the information is only as good as the informants knowledge or who fills that information in"
 
 


Sandra