Dumping oversize rock fragments in orepasses: the impact on the production cycle of a sublevel caving operation

S. Manzoor, A. Gustafson, H. Schunnesson
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Abstract

ABSTRACT Oversize rock fragments are highly undesired in a sublevel caving (SLC) operation as they affect the production cycle, equipment, and infrastructure. In this study, a field test was carried out in Malmberget mine to analyse the impact of oversize fragments on the production cycle and the costs of different procedures for handling such fragments. The tests involved monitoring of dumping oversize fragments in two orepasses, one with a grizzly and the other one without a grizzly, using cameras. The cycle times of load-haul-dump (LHD) machines were determined for both orepasses. The results indicate that the grizzly increased the availability and productivity of the orepass despite increasing the cycle time of the LHD machines. Moreover, installation of a boulder breaker system along with the grizzly can further increase the productivity and the cost of such a system will be paid off in a shorter time in terms of enhanced productivity.
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在过山口倾倒超大岩块:对分段崩落法生产周期的影响
在分段崩落法(SLC)作业中,超大岩石碎片是非常不希望出现的,因为它们会影响生产周期、设备和基础设施。在本研究中,在Malmberget矿山进行了现场试验,以分析超大碎片对生产周期的影响以及处理此类碎片的不同程序的成本。测试包括使用摄像机监控在两个通道中倾倒超大碎片,一个有灰熊,另一个没有灰熊。确定了两次超限时的装卸车(LHD)机的周期时间。结果表明,尽管增加了LHD机器的循环时间,但灰熊提高了矿道的利用率和生产率。此外,与灰熊一起安装破石系统可以进一步提高生产率,并且就提高生产率而言,这种系统的成本将在更短的时间内得到回报。
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来源期刊
CiteScore
2.20
自引率
9.10%
发文量
5
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