Análise de custos da aplicação do sistema de iniciação não elétrico em uma pedreira dos Sertões de Crateús-CE

Abstract

The rock breaking stage is fundamental in the mining process, as it directly influences operational efficiency, production costs, and the quality of fragmentation required in subsequent stages of mining. In this context, this study analyzes the technical and economic feasibility of applying the non-electric initiation system (NONEL) in a blasting plan developed for a gneiss quarry, considering that the costs of explosives and accessories represent a significant portion of blasting operations. The methodology adopted was based on a literature review, collection of geological and operational data from the quarry studied, and the development of new firing plans using the NONEL system, considering parameters such as distance, spacing, bench height, explosive charge distribution, and firing sequence. The results obtained and bibliographic studies indicate that the use of NONEL provides greater reliability in shock wave transmission, with a possible reduction in detonation failures, in addition to contributing to a decrease in the consumption of explosives and accessories. The main advantages of the system include greater operational safety, resistance to electrical interference, and the potential for reduced consumption of explosives. A disadvantage is the possibility of occasional failures associated with loss of contact in the charge column. Overall, the cost analysis showed a reduction in overall blasting costs from R$257,300.64 to R$105,285.08, or R$123,232.79, when two Nonel accessories were used per hole, showing that the NONEL system is a technically efficient and economically advantageous alternative, contributing to cost optimization and the reduction of operational risks in open-pit mining activities.