The soon to be published 1939 records probably won't help either. I was hoping they might have some extra detail when compared to the censuses, but it looks like it is going to be exactly the same, with the exception of recording if the person is a member of the armed forces or not.
What information does the 1939 Register include?
What about contacting the
National Union of Mineworkers? The National Archives have them listed as in possession of an
archive of material.
It's also possible the
Mineworkers' Pension Scheme just might have something.
Then there are the documents relating to Broomhill Collieries at Woodhorn. Lots of them. Some I'm sure will mention the men, Injury compensation books for instance. Such a search would be time consuming and not guaranteed to produce any result unfortunately.