Metalliferous Mines Regulations, 1961 - Directorate General of ...

(3)(a) Every stopping between the main intake and main return airways shall be
constructed of masonry or brickwork, not less than 25 centimetres in thickness or
such greater thickness as may be required by the Regional Inspector, and shall be
faced with a sufficient thickness of lime or cement plaster to prevent leakage of
air.
(c) Every stopping in use shall be kept accessible for inspection.
(4) The partitions and walls of every air-crossing shall be not less than 25
centimetres in thickness if constructed or masonry or of concrete not properly
reinforced, and not less than 15 centimeters in thickness if constructed of
properly reinforced concrete.
(5) Every air-crossing, ventilation stopping, door or brattice shall be maintained
in efficient working order and good repair.
(6) A competent person shall, once atleast in every 30 days, examine every
airway, air crossing, ventilation stopping and door in use, an shall record the
result thereof in a bound paged book kept for the purpose, and shall sign the
same and date his signature.
136. Auxiliary fans.- (1) Every auxiliary fan :
(a) shall be installed, located and worked in such a manner that –
(i)
(ii)
a sufficient quantity of air shall, at all times, reach it so as to ensure
that it does not re-circulate air; and
there is no risk of the air which it circulates being contaminated by any
substantial quantity of inflammable or noxious gases or dust; and
(b) shall have an air-duct for conducting the air to or from the face or blind end;
and such air-duct shall be so maintained as to minimise any leakage or air and
to ensure an adequate supply of air to within 4.5 metres of the face or blind
end.
(2) No auxiliary fan shall be started, stopped, removed, replace or in any way
altered or interfered with, except by or on the authority of an official.
(3) No person shall enter or remain in any place which is dependent for its
ventilation on an auxiliary fan, unless such fan is operating efficiently.
Whenever the ventilation of any such place has been interrupted, whether by
the stoppage of the fan or otherwise, no person shall so enter or remain
therein, except for the purpose of restoring the ventilation, unless the place has
been examined by a competent person and declared safe.
137. Precautions against fire in ventilation appliances. - The covering of every shaft,
winze or rise sealed off or covered for ventilation purposes, every fan drift, duct or casing
an every part of a mechanical ventilator or fan within such drift, duct or casting, and
every air-crossing an ventilation door shall be constructed of fire-proof material :