Edited sentence: Also, at risk of being political incorrect, many of the black workforce are not experienced miners and can unwittingly put themselves into great danger.At depth the hangingwall (roof) is constantly moving and stopes are closing up due to the extreme pressure, and what was a sound piece of hanging yesterday could today be a lose block of rock ready to fall at the slightest movement.Most of today's mines are deep and many are subject to rockbursts, which are usually unpredictable and can be lethally destructive over significant areas.Unfortunately the accident rate on the South African gold mines is likely to remain unacceptably high because they are inherently dangerous