A lot of the mills are long gone, do you know which mill they worked at?
Can you provide some street names, again, a lot of them might have gone now.
The 2 biggest graveyards are up Dill hall lane and one up Burnley Rd
This site might be of help in searching the Dill Hall Lane cemetary
http://www.lfhhs.org.uk/shop/cds/index.htm