If you are looking of a good source of information about mines, and not just coal mines we would recommend a visit to the web site of the Northern Mine Research Society, click here for a link to their web site.
They have a good section on Coal Mines which can be found here
The Coal Authority also has a useful interactive map
Its aim is to provide information on the following:
finding out if a property is affected by coal mining
checking if your site is in a high risk area
checking for coal and mine entries on or near the surface
However it give a useful indication where mine were and area which have been worked