through the primary crusher, the rock is transported by belt to the crushing and screening facilities, resulting in the desired product sizes. The daily min ing and processing operations aver age to kt (6,000 to 7,000 st) within 1 to 2 m (3 to 6 ft) of the noise source while the "far" measurements were those taken farther than 2 m (6 ft) from the source. Worker noise exposure ...