Proposal for modernization of blasting works in Austin Detonator Powder Service Company

Abstract

The aim of this diploma thesis assignment was to design a new blast design for Mokra Quarry. Since Mokra Quarry was not a hypothetical mine but a mine with existing operations that incorporates current blasting works the new design was to serve as means to modernize the current blasting works. Blast design is important because good design produces desired fragmentation and reduces cost related to material handling or secondary blasting. The modernization of blasting works at the quarry required detail assessment of current blasting practices that are undertaken. Therefor a visit to Mokra Quarry was contacted to obtain information of current blasting parameters. During the field visit information on geology, bench geometry, explosives, detonators, blast pattern and firing system were recorded. Mine workers on site assisted with logistics and technical information. Based on the information gathered planning model was formulated that incorporates input data and predicted output (results). The thesis has three main sections of importance (1). Evaluation of current blast design and parameters (2).Proposed new blast design and (3). Comparison and evaluation of current and proposed blast design. The diploma thesis finding were that the current blast design was not sufficient in comparison with the proposed blast design because of poor fragmentation (i.e. excess fines) and high cost (i.e. secondary blasting).Therefor it was recommended to amend or re-evaluate the current blasting works to benefit the quarry.