I came across this site a few days ago and saved it for future reference. I think that it would be of interest to many English researchers who had ancestors living in the north of England. I have a connection too to this part of England as will many Irish researchers.
The site covers mining in the northern part of England. County Durham, Northumberland, Cumberland, Westmorland and North Yorkshire.
Mining Disasters are mentioned with details of each accident and the names of the dead listed. Rather a sad site but an important one.