[tomkat]

Mines are dangerous places, esp. for outsiders .. people hit their heads on stuff, trip and fall down real big holes, get lost and are never heard from again . . .

(so i've heard)

[Colorado Doug]

Mines are dangerous places, esp. for outsiders

Some neighborhoods are even more dangerous places, esp. for outsiders. That doesn't explain overzealous regulation like what I am describing. I am talking about a safe, very well run mine. No big holes to fall in and to my knowledge nobody has ever got lost there, never to be heard from again.