#PIT FRAGMENTS MEANING PDF#
PDF of the production capacity based on loading cycle times. The use of loading cycle time for measuring performance of the open-pit mine focuses on one out of seven components of the total cycle time, while other researches consider all the components for identification of bottlenecks in production capacity.įigure 1. Several factors effecting productivity like location design, truck model, excavator model, weather conditions, material type, shift availability, truck-excavator matching, etc., were used to assess performance, using loading cycle time data. The answer to this problem is that there are many factors influencing the production capacity, identification and analysis of which forms the basis of this paper. This paper investigates why the mines are unable to stick to consistently high range of production capacity for a long time. The wide variations in production capacity manifests also in its high standard deviation which is about 3870 t/h, showing that very high production capacity values exist. With the mean value of 1365 t/h, it is important to note that the production capacity in one month varied between 100 and 10,000 t/h which is about 100 times.
#PIT FRAGMENTS MEANING SERIES#
Statistical time series analysis techniques were used to analyze the loading cycle time data recorded from different scenarios.Ĭhallenges in production capacity based on loading rate do exist in open-pit mine operations, leading to wide variations in the production capacity, as shown in Figure 1. In this study, identification of the factors affecting excavator/shovel performance during material loading by analyzing loading cycle time data is presented.
Understanding the factors causing performance variations can lead to improved production capacity in the rather complex and stochastic systems like material transport in an open-pit mine. For simplicity, researchers fix some factors and focus on few factors to make logical results. One of the major problems addressed in this study is the wide variation in production capacity for an open-pit mine, caused by a large number of factors. Several means of identifying costs exist, including direct financial analysis which uses operational parameters to estimate the cost using the information based on breakdown and maintenance data, fuel consumption, number and categories of employees, material transportation data, operational cycle time or delays, etc. Open-pit mine operation is an expensive business endeavor, with main cost components comprising of earth moving (or material transport) costs and heavy duty equipment investment, to mention a few. The data from such a dispatch system in Geita Gold Mine (GGM) was used in this study to assess the productivity of the open-pit mine.
#PIT FRAGMENTS MEANING DRIVERS#
Such systems are currently computerized, giving signals to truck and shovel drivers for the next operations, while storing data on loading, dumping, haul, etc. The truck dispatch problem occurs in several practical situations in the real-world, both in the mining industry and outside it, especially in any industry that needs to manage a vehicle fleet. The productivity during loading process in an open-pit mine.ĭuring material transportation in an open-pit mine, trucks shunt between shovels located in different loading points and the dump points, while fully loaded (full haul) and vice versa while empty (empty haul). Loading location, excavator model and truck-shovel combinations strongly affect
It was concluded that shift availability for excavators, Loading cycle time series were used to identify differences in performance underĭifferent situations. Non-acid forming waste rock), it was observed that loading cycle time depends on excavator model,
Under fixed tonnage loaded and waste type (33 t of Loading cycle time data for each dispatch for a period of four months (betweenĪugust and December). AboutĤ465 dispatches per excavator and 1276 dispatches per truck were assessed using Month involving several shifts, 14 excavators and 49 trucks were loaded. The data analyzed was collected from aĬomputerized dispatch system at GGM from which 62,000 loading dispatches per Loading is among the components of cycle time during which The key components of the total cycle time for material transportation in an
Time was used to assess the material loading system performance which is one of Study presents the effect of excavator model, loading operation location, shiftĪvailability and truck -shovel combination on loading cycle time and productivity of an open-pit mine.
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