Provide training in the health effects of dust and its control.Apply good house-keeping practices to prevent dust build-up.Ensure suppressed dust is captured by scrubbing or filtering so it cannot be re-entrained in workplace air.Use ventilation, either dilution or extraction, to control dust spread and dust release.Use water curtains and rubber curtains to prevent dust release, particularly at conveyor transfer points and chute draw points.Ensure ore passes are not emptied below the brow point and crusher chutes are kept full.Use water suppression to prevent dust spread.Use wet processes to prevent dust generation.Use sharp cutting tools that minimize the generation of large quantities of fine dust.Design and operate processes and activities to minimize emission, release and spread of dust.Position personnel so they are out of the dust either in enclosed and filtered cabins or so they are working upwind of dust emission.The control principles that apply to Respirable Crystalline Silica are like those that apply to all mechanically generated dust exposures. Offer regular medical examinations for workers exposed to the action level for over 30 days per year. Develop and execute a written "exposure control plan" that details work that involves exposure to silica and protection measures.Offer alternative housekeeping practices to those that expose workers to silica whenever feasible.Provide respiratory protection where dust control measures fail to reduce the silica levels to below the PEL.Take measures to control the dust where silica levels are above the PEL.Limit worker access to areas where silica levels are above the PEL.Provide their employees with protection from crystalline silica if over 50µg/m3.Measure how much silica their employees are exposed to if it is likely to be above the action limit of 25 µg/m3 averaged over an 8-hour day.With the reduction in the PEL, employers now must: OSHA has reduced the Permissible Exposure Limit (PEL) of Crystalline Silica for workers to 50µg/m3 averaged over an 8hr day. Tuberculosis (for those with silicosis).Silicosis is irreversible and continues to worsen even after exposure has ceased. When these nodules become large, it becomes difficult to breathe and can result in death.
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