How soon may a person approach the face after a shot has been fired?

When a shot has been fired in a mining operation, it is crucial for safety to ensure that the area is clear of harmful gases and debris created by the explosion. The smoke that is produced can significantly impair visibility and may also contain dangerous particulate matter. Therefore, it is essential to wait until the smoke has fully cleared before approaching the face.

This waiting period allows not only for the smoke to dissipate, increasing visibility and ensuring the area is safe to enter, but also allows for any potential harmful gases that may have been released during the blast to disperse. Mines are high-risk environments, and protocols such as this are in place to protect the workers from accidents and health hazards.

Approaching the face too soon could lead to accidents, injuries, or health risks caused by inhaling smoke or gases. Hence, it is mandatory to wait for the smoke to clear before proceeding.