Which gases are typically monitored in underground mines?

In underground mines, the monitoring of gases is critical for ensuring the safety of miners and the integrity of the mining operation. Gases such as methane, carbon monoxide, and hydrogen sulfide are particularly important to monitor due to their hazardous properties.

Methane is a flammable gas that can accumulate in underground environments, creating a risk of explosion if ignited. Carbon monoxide is a toxic gas that can be produced during various mining processes and poses a significant health hazard as it can lead to carbon monoxide poisoning without warning. Hydrogen sulfide is another dangerous gas that can be present in mining operations, characterized by its toxic nature and the potential to cause harm to individuals if inhaled.

While other gases mentioned in the options have certain industrial and environmental relevance, they do not carry the same level of immediate danger in the mining context as methane, carbon monoxide, and hydrogen sulfide do. For instance, nitrogen and argon are inert gases that do not pose a direct risk in terms of toxicity or flammability, while helium does not typically contribute to hazardous conditions within mining operations.

This highlights why the selection of methane, carbon monoxide, and hydrogen sulfide as monitored gases is appropriate; they are critical for ensuring miner safety and maintaining safe working conditions underground.