Precautions against inrushes of water

Pages:57-58
CHAPTER XIV
PRECAUTIONS AGAINST INRUSHES OF WATER
REGULATION 50. GENERAL PROVISIONS
1.
Mine operators shall be bound to acquire and record on
their plans all useful information concerning the position, extent
and depth of old workings and natural reservoirs (water-bearing
strata, known water-bearing faults, and natural springs at the
surface) that may exist in or near their mines.
2.
(1) Exploratory borings in the coal or the rock shall be
made whenever there is reason to suspect the existence of bodies
of water near the workings.
(2) The number, length and arrangement of such trial borings
shall be fixed by the mine manager in conformity with the require-
ments laid down in national laws or regulations or by the com-
petent authority.
(3) Work shall not be carried on in a mine below the level
of known bodies of water, dammed or held back by natural or
artificial means, in the same mine, except in conformity with the
requirements of the competent authority.
3.
(1) In mines under strata that are, or are suspected to
be,
waterlogged, a " protective roof " should be left intact.
(2) The thickness of this
roof,
together with such other require-
ments as may be considered necessary in each particular case, shall
be specified by the competent authority.
(3) In areas where soluble rocks or gypsum overlie coal
measures situated at workable depths, bore holes from the surface,
even if they have not reached the coal measures, shall be so filled
before abandonment that no considerable volume of water can
penetrate through them into the coal measures or into any over-
lying beds of soluble rocks or gypsum.
(4) In areas where salt deposits overlie coal measures situated
at workable depths the salt shall not be worked by solution from
bore holes.
4.
For mine workings in which the tapping of bodies of water
or of quicksand is to be feared, or is deliberately intended, national

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