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(225 ILCS 705/31.06)
(from Ch. 96 1/2, par. 3106)
If a split of air returning from active underground
working places in a mine contains as much as 1.5% of methane as
determined by a permissible methane detector, a multi-gas detector, air analysis, or other recognized means of accurately detecting
such gas, the employees shall be withdrawn from the portion of the mine
endangered thereby and all power shall be cut off from such portion of
the mine until the quantity of methane in such split shall be less than
1.5%. However, in virgin territory in mines ventilated by exhaust fans,
where methane is liberated in large amounts, if the quantity of air in a
split ventilating the workings in such territory equals or exceeds twice
the minimum volume of air prescribed in Section 31.02 and if only
permissible electric equipment is used in such workings and the air in
the split returning from such workings does not pass over trolley or
other bare power wires, and if a certified person designated by the mine
operator is continually testing the gas content of the air in such split
during mining operations in such workings, it shall be necessary to
withdraw the employees and cut off all power from the portion of the
mine endangered by such methane only when the quantity thereof in the
air returning from such workings exceeds 2%, as determined by a
permissible methane detector, a multi-gas detector, air
analysis, or other recognized means of accurately detecting such gas.
(Source: P.A. 99-538, eff. 1-1-17