History of Wigan   (Help with ancient and recent history.)

Ena... thank you for that very interesting and educational narrative. Greatly received.
Yes, Roman mining on OS (and other more relatively recent offerings) is rather speculative. All of your text is noted and agreeable.
The question of Roman activity in Wigan is still a work to be concluded... ancient writings offered a scenario. More relatively recent excavations have given us a better picture.
The earlier excavations at the Wiend revealed a Roman warehouse or perhaps factory/workhouse - in this area a store of mined coal was encountered. This can be regarded as perhaps 4 alternatives;
Coal was mined in Wigan
Coal was mined nearby
Coal was transported to Wigan for local use
Coal was temporally deposited in Wigan for use futrher on.
But, all is speculative... I hope future archaeology might give us a more accurate delineation of our town's history.
I expect every single person will have their own agenda, but I am always persuaded or given direction form actual facts.