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