Which of the following incidents qualifies as an accident in a mine?

An unplanned inundation of a mine by liquid or gas is categorized as an accident because it involves an unexpected and uncontrolled event that can lead to significant hazards, including injuries, damage to equipment, or even loss of life. This type of incident often arises from various factors such as equipment failure, geological conditions, or human error, and requires immediate response and investigation to mitigate its impacts and prevent future occurrences. Accidents in a mining context are typically defined as events that result in harm to personnel or significant property damage, which aligns with the characteristics of an unplanned inundation.

In contrast, minor injuries that don't require medical assistance do not typically qualify as accidents because they do not result in significant harm. Scheduled maintenance activities and routine inspections by safety officials are planned events aimed at ensuring safety and operational efficiency, and thus do not fall under the definition of an accident.