Probably a good starting point would be Peter Claughton's book "Mining in a Medieval Landscape: the Royal silver mines in the Tamar Valley" - I don't know how much detail there would be, if any, on the miners pay and what they were expected to do to earn that. Given how sketchy most records are for that period, it could be a bit of a long shot.
I find anything pre 1600 is a very long shot sadly their are minimal ?solid? records in my searches of places , I hope you have better luck than me I always end up getting on the lines of ?this place is Roman ? but all solid traces have been destroyed so their is only whispers .
I find anything pre 1600 is a very long shot sadly their are minimal ?solid? records in my searches of places , I hope you have better luck than me I always end up getting on the lines of ?this place is Roman ? but all solid traces have been destroyed so their is only whispers .