A good starting point for information is:
Historic England Research Report (74/2014)
Ashnott Lead Mine, Ribble Valley, Lancashire: An Archaeological Survey of the Landscape Evidence
It's downloadable as a pdf at https://research.historicengland.org.uk/Report.aspx?i=15307
There's plenty about the history and previous research of this and other mines in the area, and a good bibliography. The most relevant of the references is probably:
Gill, M C (1987)
The Yorkshire and Lancashire Lead Mines: a study of lead mining in the South Craven and Rossendale Districts
British Mining 33
Sheffield: Northern Mine Research Society
The report includes a copy of an underground sketch map first published in:
Cannell, A E and M (1966)
Ashnott Mines near Newton, Bowland, Lancashire
Memoirs 1966 Northern Cavern and Mine Research Society, 46-47
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