Very short notice, but may be of interest to anyone able to attend ...
A talk on the mining history of Halkyn (North Wales) and a recent project to survey, cap and fence shafts.
Beswick Lecture Theatre 007
University of Chester
Parkgate Road
Chester
CH1 4BJ
19:00 Thursday 16th April 2015
http://www.geolsoc.org.uk/NWRG-Historical-Lead-Mining Having read the information available at the above link I'm somewhat concerned that there is no mention of the archaeological significance of the mines or of any effort to preserve heritage features or access for underground archaeology.
If anyone does attend perhaps they could raise those questions.
Dave