A study of the correlation between dragline diggability and blasting technology at Syberfontein colliery.

[摘要] Given the high capital intensity of the draglineoperation, the mine can not afford to toleratefragmentation problems with its concomitant low draglineproductivities. At Syferfontein colliery very largeboulders and completely unfraqmented sections resultingin Low digging efficiency of the dragline wereencountered in the interburden blast,This project, investigates the causes of the blastingrelated problems with an intent of improving draglineproductivity at the minimum possible cost. This isachieved through blast monitoring, evaluation of theexisting practice (blast design) using empirical relations,fragmentation assessment using a model, analysis of operatorsperformance and dragline availabilities. Dragline productivity is evaluated in thelight of the various productivity indices , viz, fillfactor, fill time and BCM/H. The results indicatedexplosive incompatibility with the blasting environmentand. questionable practices regarding blast design andDelay performance. Engineering field controls such asreduction in drill pattern, reduction of VODof explosiveand improvement in draqline utilisation are foundnecessary.Contributing 61% to the total cost I concentrating onreducing draqline cost must receive preference overdrilling and blasting cost as it would produce the mosttangible advantage in any cost reduction effort.Regression equations relating cbst and productivity areestablished.

[发布机构] University of the Witwatersrand