Just to add to the 'resources' out there, A lot of local museums/visitor information centres have aspects of mining.
For example:
Watchet Museum - iron mines on Brendons.
South Molton- Exmoor mining
Llanidloes-Nice model of headframe and a bit about Van
Aberystwyth, Bog visitor centre, Glenridding tourism information.....etc etc
Is it worth recording these, or is it a step too far?