I could have made it a lot longer...!
One more thought, rather more pertinent to this forum:
Through the creation of a mine and its subsequent abandonment, the UKC QC's approach would have it that access would become 'as of right'.
I would counter-argue that as the existence of a mine is solely due to the actions of the landowner (and their predecessors), the right to access it must be at their discretion.
It follows that as they giveth they may also take away: bulldozing a mine entrance would seem to be within their right as a landowner to modify their land as they wish.
Essentially, while a right of access may apply whilst the mine is there, collapse of the adit (by whatever means) would make that right impossible to exercise.
Otherwise, the ultimate inference would be that a landowner would be obliged to clear underground collapses in order to allow mine explorers to access the entire mine!
To take away the right of a landowner to restrict access to a mine on their land would be a very problematic step - it would, in all probability, lose a lot more access than it ever gained.
Indeed, we've already seen landowners blocking adits because of the fear of the CROW Act.
We'll all be a lot better off if people don't go barging across farmland and demanding access underground 'as of right' - that right certainly doesn't exist at the moment and may well never be granted by a Court of law.
The potential gains are very slight, but the potential losses are massive.
Hello again darkness, my old friend...