I've just been reading the posts on this subject over at ME.
as has been rightly pointed out, some people view this through professional eyes and some, as enthusiastic amateurs.
I really can't add to Simon H's post on this subject at ME. I don't know enough about the specific case to comment, but the general issues are apparent to anyone with suitable experience.
The possible pitfalls are immense, and speaking as a Chartered Engineer with considerable experience of entering, reworking and abandoning derelict mine workings in various contexts, I certainly wouldn't link myself professionally or financially to a project of this scope and nature.
As I mentioned before, I'm sure Wardell's are keeping schtum because in their view, there is no credible strategy, client or authority.
Let's have a little perspective. This is a very large, open working with at least two long-term tenants whose co-operation you have no reason to be assured of. It undoubtedly contains bats, who have legal rights which, like the Peace of God, passeth all understanding. It is apparently much out of favour with EA, is an Ancient Monument - which confers great restrictions and obligations, but no money to pay for them, enthusiastically championed at times by well-connected Ladies Who Lunch - and an SSSI to boot. By way of a finale, it occasionally sheds blocks the size of cars from its roof, without warning.
I would concur with Simon H in advising the utmost caution.
''the stopes soared beyond the range of our caplamps' - David Bick...... How times change .... oh, I don't know, I've still got a lamp like that.