Resumo

GOMES-SEBASTIAO, G.L.  e  DE GRAAF, W.W.. An investigation into the fragmentation of blasted rock at Gomes Sand. J. S. Afr. Inst. Min. Metall. [online]. 2017, vol.117, n.4, pp.321-328. ISSN 2411-9717.  http://dx.doi.org/10.17159/2411-9717/2017/v117n4a2.

Gomes Sand is a quarry operation that produces sand and aggregate for the construction industry. The quarry is experiencing inconsistencies in the fragmentation and poor pit conditions as a result of poor drilling and blasting practices. This results in excessive downtime in the load and haul and crushing processes. A benchmarking exercise of the blasting practices was conducted to evaluate the effect of the inconsistency on the mining cycle. After changes in the blasting practices the downtime was reduced, which improved the crushing plant utilization by 4.9%. The improved blasting practices and more consistent fragmentation decreased the average number of loads lost each month due to jaw crusher blockages from 9.2% to 3.9% of plant throughput. The change in blasting practices also improved pit conditions.

Palavras-chave : drilling; electronic delay detonators; blasting practices; fragmentation; communition; crusher throughput.

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