(225 ILCS 705/34.04) (from Ch. 96 1/2, par. 3406)
Sec. 34.04.
During pillar recovery in any mine when working places approach
within 50 feet of abandoned sealed workings, as shown by surveys made and
certified by a competent engineer or surveyor, which may contain dangerous
accumulations of water or gas, or within 200 feet of any workings of an
adjacent mine, boreholes shall be drilled to a distance of at least 20 feet
in advance of the face of such working place. Such boreholes shall be
drilled sufficiently close to each other to insure that the advancing face
will not accidentally hole through into such workings. Boreholes shall also
be drilled not more than 8 feet apart in the rib of such working place to a
distance of at least 20 feet and at an angle of 45 degrees. Such rib holes
shall be drilled in one or both ribs of such working place as may be
necessary for adequate protection of persons working in such place. The
above provisions shall apply to any working place in any mine at any time
should conditions warrant same in the interest of safety.
(Source: Laws 1957, p. 2413.)
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