Abstract
Uniformity index n represents the range of fragment size distribution and it is applied to evaluate fragment size by Rosin and Rammler cumulative distribution function for a muck pile. The uniformity index n of fragment size distribution has been assessed by digital image analysis technique using Split-Desktop for several blasthole parameters and different zones of in-situ rock mass conditions in five mines having a wide range of blastabilty index (BI). Rosin and Rammler equation has been determined by a new procedure using a software entitled Pixler to delineate images the same as manual method for achieving a proper fragment size distribution by Split-Desktop. The obtained values of n had significant differences with estimated n by the former equations. Relations between n and several blasthole parameters, BI and mean fragment size X50 of the results and their various combinations have been analyzed. Finally, a new empirical model having a good correlation has been developed to predict n value for using 25 ms electric delay detonators.
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Acknowledgments
The authors would like to thank Mr D. Taghizadeh, Mining Engineer of Rashakan Limestone Mine, Mr M. Baghernegad, Managing Director of Sungun Open Pit Copper Mine, Mr M. Shabany, Managing Director of Angouran Lead and Zinc Open Pit Mine and Mr Ahmadzadeh, Mining Engineer of Soufian Limestone Mine and Mr S. Habibi, Mining Engineer of Bonab Tootakhaneh silica mine, for their continuous support during carrying out the project.
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Published in Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, 2020, No. 1, pp. 54–65.
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Nourian, A., Moomivand, H. Development of a New Model to Predict Uniformity Index of Fragment Size Distribution Based on the Blasthole Parameters and Blastability Index. J Min Sci 56, 47–58 (2020). https://doi.org/10.1134/S1062739120016478
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DOI: https://doi.org/10.1134/S1062739120016478