Where must mine maps be kept at all times?

Mine maps are a critical aspect of ensuring safety and operational efficiency in underground mining. They depict the layout of the mine, including tunnels, shafts, and other vital infrastructure. Keeping mine maps in the mine office is essential because this location provides immediate access to information that is crucial for daily operations, emergency situations, and safety planning.

The mine office serves as the central hub for communication and coordination among the mining staff, making it the most practical and effective place for mine maps to be stored. This location allows for quick reference during emergencies, such as evacuations, where miners may need to find escape routes or avoid hazardous areas.

In contrast, storing mine maps in locations like local government offices or operators’ home offices would not facilitate on-site decision-making and could lead to delays in response times during critical situations. Similarly, while miners' safe-houses may offer some level of protection, they are not ideal for the operational access required by the mine staff on a day-to-day basis. Hence, keeping mine maps in the mine office is the best practice for ensuring both safety and operational integrity.