Line curtain should be kept close to the face primarily to control exposure to which hazard?

Line curtain should be kept close to the face primarily to control exposure to which hazard?

• A. Methane
• B. Oxygen deficiency
• C. Coal dust
• D. Hazardous gases

Answer: (A)

Keeping the line curtain close to the face creates a barrier that limits gas moving from the gob into the face area. Methane is the main gas hazard in underground coal mining because it can mix with intake air and create an explosive environment. By positioning the curtain near the face, you reduce the amount of methane that miners are exposed to and hinder its entry into the working area, lowering the risk of a methane-related explosion. Oxygen deficiency depends on overall ventilation and air flow, which the curtain alone doesn’t fix. Coal dust control relies on dust suppression and ventilation strategy, not curtain proximity. While other gases are possible, methane is the specific hazard this curtain practice is designed to mitigate.

Keeping the line curtain close to the face creates a barrier that limits gas moving from the gob into the face area. Methane is the main gas hazard in underground coal mining because it can mix with intake air and create an explosive environment. By positioning the curtain near the face, you reduce the amount of methane that miners are exposed to and hinder its entry into the working area, lowering the risk of a methane-related explosion. Oxygen deficiency depends on overall ventilation and air flow, which the curtain alone doesn’t fix. Coal dust control relies on dust suppression and ventilation strategy, not curtain proximity. While other gases are possible, methane is the specific hazard this curtain practice is designed to mitigate.