(a) Underground section boxes or magazines shall be constructed of substantial nonsparking material and shall be placed in a crosscut or idle room neck at least 25 feet from roadways, trolley wires, or power lines, at least 75 feet from any working face and in a reasonably dry and well rock dusted place, free of oil, grease, or other debris.
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(b) Explosives and detonators shall be stored separately and at least five feet apart. Not more than a 48-hour supply of explosives and detonators, including any surplus remaining from the previous day, shall be stored underground in section boxes or magazines. This maximum 48-hour supply will include supplies in individual or face boxes where used.(c) A one day’s supply of explosives and detonators may be kept in individual or face boxes. Those boxes shall be wooden with hinged lids and shall be kept not less than 15 feet from roadways, trolley wires, or power lines; provided, that 15 feet may be reduced to five feet when the boxes are kept in a niche in the rib at least 75 feet from any working face and in a location out of line of blast where they will not likely be subjected to shock. Separate boxes, kept at least five feet apart, shall be used for explosives and detonators.(d) Explosives and detonators shall be kept in their containers until removed for use at the working faces.(e) Care shall be exercised to use the oldest explosives from storage before new supplies are used so that explosives will not remain in underground storage long enough to deteriorate.
