The average haul distance was reduced from 950 ft to 750 ft by improving feeder-breaker move times.
Setting up the feeder-breaker stations at Copper Range is a much more elaborate operation.
The feeder-breaker is then bolted onto the structural-steel foundation.
The better fragmentation has reduced primary breakage costs by lowering feeder-breaker maintenance costs by 50%.
The face conveyor can usually carry the fallen rock to the feeder-breaker where it is crushed.
These shots represented the main goal of clearing large rocks that jammed the face conveyor or the feeder-breaker as illustrated in Fig.
The face area was rock dusted within 40 ft of the feeder-breaker, and two sheathed charges were placed on the large rock causing the jam.
The next shot was very similar to that described above except that the face conveyor was stopped before the rock had a chance to get stuck at the feeder-breaker.