The work will, I understand, be on the opposite side from the Hunter-bored tunnels in the 'David Jones' part of the quarry.
As a result, Greaves need to be sure that they're not going to drop the roof onto anyone's head who happens to have ambled into the mine and is walking around mill floor - hence the blocking of the adit.
🔗Maenofferen-Slate-Mine-User-Album-Image-54782[linkphoto]Maenofferen-Slate-Mine-User-Album-Image-54782[/linkphoto][/link]
I would, however, offer up the comment that blocking the adit may not be the best of solutions in the longer term: once the chambering is opened up as the untopping gathers pace, the lure of an easy entrance may be too much for some to resist and it would be a *very* bad idea to be walking around in an area that's been recently blasted and has an unstable roof.
Hello again darkness, my old friend...