The MSHA’s proposed rule is a testament to the growing concern about the health implications of prolonged silica dust exposure. The new standards aim to lower the permissible limit of silica dust exposure for mining workers. The proposed rule suggests a limit of 25 micrograms per cubic meter of air for a full shift exposure, calculated as an 8-hour time-weighted average. This is a significant reduction from the current permissible limit of 50 micrograms per cubic meter. Notably, this proposed standard aligns with the current silica exposure limits set by the Occupational Safety and Health Administration (OSHA).

THE IMPORTANCE OF ENGINEERING & ADMINISTRATIVE CONTROLS

To achieve these new standards, mines will be required to implement comprehensive engineering controls. These controls serve as the primary means to reduce silica dust creation at the source. They encompass a range of solutions, from advanced machinery modifications to innovative technologies that minimize dust generation.

However, engineering controls alone might not suffice. The proposed rule also emphasizes the importance of administrative controls. These controls are procedures and policies that help reduce workers’ exposure to silica dust. Examples include protocols for safely removing dust from work clothes, regular cleanup routines, and other measures that reduce both exposure and creation of silica dust.