What is the time frame for conducting a pre-shift examination?

The correct timeframe for conducting a pre-shift examination is three hours before the shift starts. This timing is essential to ensure that any potential hazards or unsafe conditions in the workplace can be identified and addressed adequately before the miners begin their work. Conducting the examination three hours in advance allows enough time for any necessary corrective actions to be implemented and ensures that the safety of all personnel is prioritized. This procedure contributes to the overall safety management within the mine, helping to prevent accidents and promote a culture of safety awareness among workers. The other timeframes do not sufficiently allow for the thorough assessment that is required to ensure the work environment is safe before miners enter the site.