What is the threshold value of silica according to the revised mines safety regulations?

The threshold value of silica as outlined in revised mines safety regulations is identified as being within the range of 5-50 mppcf. This standard is crucial for ensuring the health and safety of miners, as inhalation of silica dust can lead to serious health issues, including silicosis and other respiratory diseases.

Establishing a threshold allows for monitoring and control measures to be put in place, thereby reducing the risk of exposure to harmful levels of silica. This value is determined based on extensive research and statistical analysis to ensure it represents a safe limit under varying conditions in mining operations.

While the other ranges provided might seem plausible, they do not align with the findings and recommendations set forth by relevant health and safety authorities regarding silica exposure in mining environments. The adopted threshold is a clear indication of a concerted effort to protect workers from the adverse effects associated with silica dust exposure.