(a) Auger machines which are exposed to highwall hazards, together
with all those parts of any coal elevating conveyors where persons are
required to work during augering operations, shall be covered with heavy
gage screen which does not obstruct the view of the highwall and is strong
enough to prevent injuries to workmen from falling material.
(b) No work shall be done under any overhang and, when a crew is
engaged in connecting or disconnecting auger sections under a highwall, at
least one person shall be assigned to observe the highwall for possible