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Road management and maintenance
Published in Thompson Roger J., Peroni Rodrigo, Visser Alex T., Mining Haul Roads, 2019
Thompson Roger J., Peroni Rodrigo, Visser Alex T.
This shows that there is a need to repair defects such as potholes, depressions, corrugations and rutting by means of motor-grader interventions. However, a haul road with a semi-permanent surfacing should be able to withstand damage by tyres if properly constructed. Some mines are now moving towards long-life roads where a minimum of grader maintenance would be required. Under those circumstances the main defect would be dust from spillage or carry-on by tyres. A motor-grader would not be efficient in removing dust, and cutting the hard surface has to be avoided. The maintenance strategy has to be adapted, and often a rotary broom shown in Figure 5.8 is used. Unfortunately a significant cloud of dust is generated (Fig. 5.8) and, in the absence of wind, the dust will again settle on the road, where an unacceptable dust cloud would be created by the haul trucks. In some operations water is sprayed by the broom operation, which reduces the dust and a roll of mud is then swept off the road. This approach may not be highly effective. An alternative procedure would be to use a truck-mounted vacuum cleaner, as is used on some diamond mines, to collect the dust without abrasion. The collected dust would then be disposed of in a waste dump. Spillage of rocks would have to be removed manually or by a ‘hit-squad’, and trucks should be loaded to the correct capacity to avoid rock spillage. It must be appreciated that using semi-permanent surfacings would require a change in the mine road management strategy.
Operational experience at the Line Creek Mine
Published in Tad S. Golosinski, Val Srajer, Off-Highway Haulage in Surface Mines, 1989
From an operators perspective the haul truck is the primary equipment used in open pit mines for the transport of waste or ore. There has been a thrust towards bigger and more efficient trucks to increase mining productivity, but until now the development of larger haul units has been restricted to electric drive trucks. Mechanical drive units greater than 120t capacity have only recently been introduced.
Benefits and limitations of field-based monitoring approaches for respirable dust and crystalline silica applied in a sandstone quarry
Published in Journal of Occupational and Environmental Hygiene, 2022
Emanuele Cauda, Eric Dolan, Andrew Cecala, Kyle Louk, Milan Yekich, Lauren Chubb, Andrew Lingenfelter
As a result of conducting Helmet-CAM assessments, it was determined that the QC lab operator had one the highest exposure levels out of all sessions collected in the quarry. The combined analysis of the video files in EVADE showed that exposures for the QC lab operator occurred while conducting typical QC tasks of analyzing quarry samples. This additional layer of information is one of the benefits of using the Helmet-CAM strategy. Similarly, it was determined that the haul truck drivers were experiencing elevated levels of respirable dust concentrations while entering and leaving the quarry pit. The higher dust exposures in this area of the mine were a result of drilling near the entrance of the pit. Being able to identify exactly where the mine workers were and what tasks they were performing allowed for the identification of these high-exposure events, as in the case of the QC lab operator, or to identify trends and patterns, as in the case of the haul truck drivers.
Energy consumption in mine haulage due to road pavement performance
Published in Mining Technology, 2019
Jarrad Coffey, Hamid Nikraz, Colin Leek
This study has highlighted that optimization of haul road pavement performance, in terms of haul truck energy consumption, appears possible through modifications to the functional, structural and maintenance design. The following are recommended to optimize the functional design and maintenance: Unbound wearing course materials should be gravel materials, ideally with high plasticity of high fines content that prevents ravelling, whilst providing suitable traction. Figure 1 appears a suitable starting point for design assessment utilizing the processes in this paper;The frequency of blading of wearing courses should be selected to optimize haul truck energy consumption;
Analysis of dust emission at coal train loading facility
Published in International Journal of Mining, Reclamation and Environment, 2018
Bisleshana B. Prakash, Vladislav Kecojevic, Ali Lashgari
Cole and Zapert [39] completed a study and concluded that ISC3 model overpredicted the actual PM10 concentrations ranging from a factor of less than 1 (87% over-prediction) to a factor of 5. Authors concluded two reasons of over-prediction – (i) the model failed to account any deposition of the particulates and (ii) the EF for unpaved roads overpredicted the amount of emissions from haul trucks. Reed et al. [40] also completed a study on the ISC3 model using a theoretical rock quarry and concluded that the majority of PM10 concentrations are caused by hauling operations and the haul truck emissions factors may be part of the cause of the over-prediction of PM10 concentrations by the ISC3 model. Reed [41] described a model called the Dynamic Component Programme (DCP) based on a Gaussian equation similar to that used by the ISC3 model for predicting dust dispersion from haul trucks.