@Tonyp I saw your comment (on the other topic - New coal mine in Cumberland) and as I am often on the Durham Mining Museum (DMM) site I checked the list of Names of those killed at this colliery and your granda, Joe Curley, is not in the list. I know the DMM is ran by volunteers and although I would expect they have access to the old colliery records it does appear that they also rely on updates from the general public.
I don't think anyone who was killed in that industry whilst doing their job should be forgotten. You should get in touch with them to update their records.
This is the link to the 'D' index of pits :- http://www.dmm.org.uk/colliery/index_d.htm
And this is the link to the DMM Contact Details page :- http://www.dmm.org.uk/misc/contact.htm