938                                        LAWS OF MARYLAND                            [Ch.

CONSTRUCTED LINE BRATTICE SHALL BE USED FROM THE LAST
OPEN CROSSCUT OF AN ENTRY OR ROOM, WHEN NECESSARY TO
REMOVE GAS, EXPLOSIVE PUKES, AND SMOKE. IF DAMAGED,
IT SHALL BE REPAIRED PROMPTLY.

(2)    SPACE BETWEEN BRATTICE AND RIB.—THE
SPACE BETWEEN THE LINE BRATTICE AND THE RIB SHALL BE
LARGE ENOUGH TO PERMIT THE FLOW OF A SUFFICIENT VOLUME
OF AIR TO KEEP THE WORKING FACE CLEAR OF FLAMMABLE AND
NOXIOUS GASES.

(3)                 CONSTRUCTION                               OF
BRATTICE.—FLAME-RESISTIVE MATERIAL SHALL BE USED IN
THE CONSTRUCTION OF LINE BRATTICE.

REVISOR'S NOTE: This   subsection presently appears

as Article 66C, section 573(a) and

(b), inclusive, of the Code. The "s" after

"explosives" is proposed for deletion
because the word "explosive" qualifies

"fumes". The only other changes made are
in style.

(J) OLD WORKINGS.—

(1)      POSTING WARNINGS; SEALING OR
VENTILATING.—THE ENTRANCE TO ANY ABANDONED WORKING
SHALL BE POSTED TO WARN ANY UNAUTHORIZED PERSON
AGAINST ENTERING THE TERRITORY. EVERY ABANDONED
WORKING SHALL BE SEALED OR VENTILATED.

(2)   MANNER OF SEALING.—WHERE THE PRACTICE
IS TO SEAL AN ABANDONED WORKING, IT SHALL BE DONE IN A
SUBSTANTIAL MANNER WITH INCOMBUSTIBLE MATERIAL. IN
EVERY SEALED AREA, ONE OR MORE OF THE SEALS SHALL BE
FITTED WITH A PIPE AND CAP OR VALVE TO PERMIT THE GAS
BEHIND THE SEAL TO BE SAMPLED AND PROVIDE A MEANS OF
DETERMINING ANY EXISTING HYDROSTATIC PRESSURE.

(3)   REUSING AIR IN GASSY MINES.—IN GASSY
WINES, AIR THAT PASSES THROUGH OR BY ABANDONED
SECTIONS OR VENTILATES PILLAR LINES MAY NOT BE REUSED
TO VENTILATE LIVE FACE WORKINGS. MINES THAT CANNOT
COMPLY WITH THIS REQUIREMENT, ON JULY 1, 1973, MAY
CONTINUE TO OPERATE UNTIL FUTURE MINE DEVELOPMENT AND
VENTILATION CAN BE CHANGED TO PERMIT COMPLIANCE WITH
THIS SECTION.

REVISOR'S NOTE: This subsection presently appears
as Article 66C, section 574 (a) through (c),
inclusive, of the Code. The only changes