Dear Old Maggie, who, as you write, did so much for the British Coal industry - was of course great friends with Chile's benevolent, caring and compassionate* leader Pinochet.
Pinochet's brutal dictatorship combined with his laissez-faire economic style is certainly part of the reason for the utter lack of safety which led to the collapse of this mineshaft.
So, by association, it's Maggies fault.
The milk-snatching union-bashing polltax-grabbing pain in the ass.
Paris - cos she'd have loved to have had 33 miners in a hole.