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The size and type of transportation equipment in the quarry, pit, or mine should be coordinated with the primary crusher and with the proposed method of feeding this machine.
It is not our purpose to discuss the selection of quarry equipment, other than to point out the ways in which different types and sizes of transportation equipment may affect the operation at the primary crusher house.
It is difficult to deal with this subject in precise terms, because the factors involved are so variable, but a few general statements about what is, and what is not, considered to be sound practice may serve to point in the right direction, even if they do not give the exact distance.
Except for those rare cases where the size of the primary crusher receiving opening is greatly in excess of the size of the largest pieces of rock to be fed to it, the amount of material dumped into it at one time should not be much more than to fill the crushing chamber j otherwise, if blocking 01' bridging occurs, the time consumed in clearing the receiving opening is bound to be excessive. Therefore, if quarry cars of the quick-dumping type are to be used, their size should be selected with a view to preventing such a condition. For the average quarry operation the following table will serve as an approximate guide in establishing the maximum size of quick-dumping car that should be used to feed different sizes of gyratory crushers:
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