In an underground limestone mine, samplers were placed in the immediate intake and return of
an underground crusher to determine the amount of dust liberated during the dumping/crushing
of the limestone. Figure 2-4 illustrates these sampling locations. Samplers are placed on both
sides of the entry at both sampling locations to obtain more representative measurements of the
airborne dust concentrations.
Figure 2-4. Sampling locations used to isolate dust generated at an underground crusher.
The concentrations from both sides of the entry are then averaged.
If gravimetric samplers are used for this evaluation, the samplers must operate long enough to
ensure that sufficient mass is collected during sampling