Abstract
The existing blast fragmentation models were investigated in a sandstone quarry for bench blasting
 operations. It was tried to present different perspectives for evaluation of blast fragmentation.
 Size distribution curves were created for each blast. KuzRam model provided successful results.
 Kuznetsov-Cunningham-Ouchterlony (KCO) model was useful especially for the fine size
 predictions. Capability of the models for fine, mean and coarse size predictions were evaluated in
 detail. Uniformity coefficients proposed by the models were examined. Chung & Katsabanis model
 was practically tested and a modification implemented for the studied quarry. Model validation was
 performed using ten different error metrics. Applicability of symmetric errors and scaled errors was
 investigated for evaluation of blast fragmentation. KuzRam model predicted mean fragment size
 with an error lower than three centimeters. The results of the modified Chung & Katsabanis model
 is quite promise.
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