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That's true for underground coal operations, specifically at the working face, where the coal is actively being extracted. MSHA rules for ventilation, airflow, and air quality are very strict due to the dangers associated with stray sparks, static charge, open flames, etc., when working in a confined space with coal dust and methane gas. Diesel equipment use underground is permissible by MSHA away from the working face(s) if they meet some fairly rigorous guidelines.I thought most under ground mines where going to electric everything?
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