Where must the mine ventilation plan revisions be submitted?

The mine ventilation plan revisions must be submitted to the MSHA district manager because MSHA, or the Mine Safety and Health Administration, is the federal agency responsible for regulating safety and health in mines across the United States. This includes overseeing the ventilation plans that are crucial for maintaining air quality and ensuring the safety of miners underground. These plans must be reviewed and approved by the MSHA to confirm that they meet the necessary safety standards and regulations. Submitting revisions to the MSHA district manager ensures that any changes made are in compliance with federal laws and that the working conditions of the mine are safe for all personnel involved. This process is a key component of maintaining regulatory oversight and protecting the health of miners.