159. Every outside conveyor used to transport asbestos ore, asbestos concentrates or asbestos tailings and all transfer points must be completely enclosed and connected to a dust collector whose asbestos fibre emissions comply with the limit prescribed by section 158.
If the loading or unloading of ore or asbestos concentrates into or from trucks, railroad cars or ships causes particle emissions visible more than 2 m from the emission point, the person in charge of the source of contamination must take the necessary measures so that the loading or unloading points are in an enclosed space that has ducts which draw the particles into a dust collector in such manner that the asbestos fibre emissions comply with the limit prescribed by section 158.
This section does not apply to stacker-conveyors discharging asbestos tailings onto waste piles.