Hi,
Sorry I have only just seen your post ...
Rossendale is my old home town and, sadly, the big mines have been landfilled 😠
However, there are plenty of mines left to see (mostly Sandstone) and the best people to help you are;
https://www.facebook.com/# !/groups/154513521239680/
They do a lot of Urban Exploring but they also know the mines. The main "guys" on there can help you ..
😉
Ian
A door, once opened, may be stepped through in either direction.