1392

LAWS OF MARYLAND

Ch. 418

powder, or cardox heater elements in amounts of 125 pounds
or less, or. 5,000 detonators or less, shall be stored in
accordance with preceding standards or in a separate
box-type magazine. A box-type magazine also may be used as a
distributing magazine when quantities do not exceed those
mentioned. A box-type magazine shall be constructed of 2
inch hardwood or its equivalent. Each metal magazine shall
be lined with nonsparking material. No magazine may be
placed in a building containing oil, grease, gasoline, waste
paper, or other highly flammable material, nor may it be
placed less than 20 feet from a stove, furnace, open fire,
or flame.

(c)  If feasible, the location of any magazine shall be
at least 200 feet from any mine opening unless the opening
is barricaded effectively.

(d)  The supply kept in any distributing magazine shall
be limited to approximately one day's requirement. The
supply of explosives and detonators may be distributed from
the same magazine, if separated by at least a 6 inch
fastened hardwood partition or its equivalent.

(e)  The area within 25 feet of any magazine shall be
kept free of rubbish, dry grass, or other combustible
material.

(f)  If the explosives magazine is illuminated
electrically, each lamp shall be of an explosion-proof type,
installed and wired to afford minimum fire and contact
hazards.

(g)  Only a nonmetallic tool may be used to open any
container. Extraneous material may not be stored in an
explosive or detonator magazine.

(h) Carrying smokers' articles or any open flame in or
near any magazine is prohibited.

(i) A cardox charging station shall:

(1)  Be in a fireproof structure on the surface
or isolated from any other operation in the building by a
substantial fireproof partition;

(2)  Be provided with at least two methods of
relieving excess pressure in the storage tank. If one of
these methods is a valve, the valve shall be tested monthly;
and

(3)  Have a box-type magazine or its equivalent
for storing the daily supply of heater elements.

(j) (1) Individual Containers. — Permissible
explosives or detonators carried underground shall be in an
individual container constructed of substantial
nonconductive material, maintained in good condition, and
kept closed.