Where in an underground coal mine is hydrogen sulphide commonly found?

Hydrogen sulfide is commonly found in stagnant water in underground coal mines due to its production through the microbial breakdown of organic matter in anaerobic conditions. When water remains still or gets trapped in low-lying areas of the mine, the lack of oxygen promotes the activity of sulfate-reducing bacteria, which generate hydrogen sulfide. This gas can then accumulate in these stagnant areas, posing potential hazards for miners.

Understanding the sources of hydrogen sulfide is crucial for safety, as its toxic properties can lead to severe health risks, including respiratory issues and potential fatalities in high concentrations. Stagnant water bodies serve as a conducive environment for its formation compared to other locations such as ventilation shafts, which are designed for airflow, or heating areas, where the temperature may impact gas solubility.