ok here are the surrounding places in and around Bolton that i could find.
Astley Bridge
Barrow Bridge, Belmont Village, Blackrod, Bradshaw, Breightmet, Bromley Cross, Burnden
Bolton Central
Captain's Clough
Darcy Lever, Daubhill, Deane, Derby, Doffcocker, Dunscar
Eagley, Edgworth, Egerton
Farnworth, New Bury and Highfield
Great Bolton, Great Lever
Halliwell, Harwood, The Haulgh, Heaton, Horwich, Hungerhill
Kearsley
Ladybridge, Little Bolton, Little Lever, Lostock
Markland Hill, Middlebrook, Moses Gate, Moss Bank
Prestolee
Red Bridge, Rumworth
Sharples, Springfield, Stoneclough
Tonge Moor, Tonge Fold, Turton (part)
Westhoughton
Now which half do you want to research about, and if you decide to do so, see if anything in these places has anything to do with blackleach.