The North East's coal mining past is an important part of our heritage, but how much do you know about its effect on the area where you live?
At the industry's peak, there were 400 pits, employing a quarter of a million people.
The records of the Durham Miners' Association from that time are held at Sunderland University.
Now for the first time, the whole collection is available on the internet. It is attracting interest from scholars all over the world. Lucy Taylor has been to see it.
More top news
On a tour of the North East today, the Chancellor George Osborne made a series of promises which he claimed would help create 50,000 jobs.
Hundreds of people are expected to take part in two separate demonstrations in Newcastle tomorrow.
Teesside car parts manufacturer Nifco has announced a new £50 million deal with US car giant Ford.