[abe is now!]

Suppose you built a mine to harvest Mudokon bones, and then found coal or gold seams in it, now Blind Mudokons are slightly harder to maintain than normal ones, and Glukkons are out to make the biggest profit after all, so the gold and coal etc would be mined by Mudokons who could actually see what they were digging to cut costs, the only difficulty would be ensuring the two groups never met. This would explain the paranoiac security around the place.

And why in the game this doesn't appear? Why do I see some normal Mudokons digging something that I think it's bones whereas it's something else?