I think there is a conspiracy by certain companies to make work for themselves by charging vast amounts to fill in shafts (which IS technically difficult) instead of just fencing or capping. A few years ago an enormous amount was spent making the limestone mines around Dudley "safe" by filling with fly ash, curing a problem that didn't exist......
See http://www.ukqaa.org.uk/CaseStudyMonsHill/CaseStudyMonsHillMarch2004.pdf
Rather amusingly, the company concerned was called "Forkers Ltd."
Interesting article - there's been quite a bit of discussion about land ownership versus mineral rights on the forum so is it really true that just because it's on the owner's land it's their problem? IIRC isn't there a national body that still deals with subsidence due to coal mining activity?
Also regarding the Dudley Mines: some caverns are still accessible by taking a narrow boat trip with the Dudley Canal Trust. I also heard a rumour recently that the council was thinking about re-opening part of them - they were only filled in in the early 1990's. Shortsighted government?
A lot of the problems with covering the expences of looking after relict mines from both structual problems and acid mine drainage problems is that the mines were closed after ecconomic difficulties and court cases eventually end up making the original owner bare the cost who has no money now... so you get stuck
A lot of the problems with covering the expences of looking after relict mines from both structual problems and acid mine drainage problems is that the mines were closed after ecconomic difficulties and court cases eventually end up making the original owner bare the cost who has no money now... so you get stuck