History | Mine Safety and Health Administration (MSHA)
The Federal government passed modest legislation to establish minimum ventilation requirements in underground coal mines and prohibit operators from hiring children under age 12.
Coal mining - Wikipedia
Coal mining is the process of extracting coal from the ground. Coal is valued for its energy content, and, since the 1880s, has been widely used to generate electricity. Steel and cement industries use coal as a fuel for extraction of iron from iron ore and for cement production.