What is the maximum quantity of explosives that may be stored underground in magazines?

The correct response indicates that the maximum quantity of explosives that may be stored underground in magazines is restricted to no more than a 48-hour supply. This regulation is designed to ensure safety within underground mining environments, where the presence of explosives poses significant risks due to potential accidents or unauthorized access. By limiting the supply to a 48-hour amount, the rules help manage the hazards associated with explosive materials, including the risk of fire, detonation, and the impact on personnel and equipment.

Keeping the quantity minimal reduces the potential dangers and allows for more frequent resupply, thus maintaining better oversight of explosive inventories. This measure also ensures that miners work in a safer environment, minimizing the risk of prolonged exposure to dangerous materials. Compliance with this regulation is crucial for maintaining operational safety and adhering to mining safety standards in West Virginia and in various mining jurisdictions.

The other options suggest larger quantities or no limits, which would pose increased risks and is not aligned with safety protocols established in mining regulations.