The newer sites and positions of adits and shafts are shown on the Coal Authority interactive viewer.
Some of the older shafts and workings - for the walk me and ICLOK did are based on Farey and Geology maps.
Also note the Farey survey can be read on the internet (google books) for free.
I am not sure if there is a recent book or paper for Belper Coal Mines or whether one is currently being written.
Records or history of mines etc are likely to be in family archives etc
I went in a mine once.... it was dark and scary..... full of weirdos
When do I get my soapbox, I need to rant on about some b***cks