LKAB MASTER THESIS
A cell is connected to other cells based on a weighted system used for neighbour calculations. The ability to change grade values is essential in order to maintain a profitable operation, but the changed value should be reflected in the draw control strategy by adjusting either the extraction ratio targets or production capacity. Cut-off and shut-off grades should be included in the draw control strategy as well, while grade control should include marginal operating costs and metal prices to provide a more accurately calculation of the average ore grade and shut-off grade. The International Caving Study. Hence, the mine currently has between 18 and 25 active drawpoints. At this point, only the two first criteria are displayed in the LHD cabin for operators.
The authors acknowledge LKAB for its financial and infrastructural support. A cell is connected to other cells based on a weighted system used for neighbour calculations. Shekhar I ; A. The mechanics and design of sublevel caving systems. Zhigui and Xingguo state that cut-off grades are the primary problem with the current draw control strategies and propose a ‘non-dilution draw’ method. The operator can see information related to ring location 1 , last bucket weight 2 , ring design 3 , extraction ratio ratio of the total tonnage of material loaded from the drawpoint to the estimated tonnage of the ring 4 , system status 5 , report status 6 , loading graph 7 , nearby charged holes 8 , ring information 9 , and extraction ratio of proximate rings All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License.
Loading criteria Loading criteria are a set of rules and guidelines that control the loading and closing of drawpoints in SLC. The density-based method is used when there is a significant difference in the density of ore and waste. Study of the influence of interactive draw upon drawpoint spacing in block and sublevel caving mines. In this method, loading should be stopped as soon as dilution is encountered at the drawpoint Zhigui and Xingguo, Doctoral thesis, University of Queensland, Australia.
The results of past studies show that dilution entry in its present form cannot be a useful parameter for judging drawpoint performance because of the non-uniform or chaotic nature of ore flow.
It took only hours to completely analyse more than 2 million draw strategies over the SLC footprint Jamieson, WOLIS Wireless Loader Information System uses the bucket weight together with an assumed theoretical volume of the loaded material to calculate the grade of the material in each fully loaded bucket, i.
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PGCA is a particle-to-particle-based flow modelling technique that can account for material properties, cave back constraints, and other aspects relevant to material flow in caving Power and Campbell, However, for certain cases such as diamond mining, sampling is difficult and ‘observational’ assessments of dilution are required or other indicators for drawpoint monitoring should be created.
It will give SLC mines the flexibility to change their production strategy to better align with production demands and metal prices. Large scale physical modeling and full scale experiments. The weight is directly proportional to the distance from the main cell to the sampling point of the neighbouring cell Salinas, The material can be loaded from the adjacent drift to try to loosen and release low hang-ups, while a kaster ring can be blasted in the adjacent drift to release high hangups.
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All the contents of this journal, except where otherwise noted, is licensed under a Creative Fhesis Attribution License. Historical data on drawpoint abandonment and other performance-related information can provide a baseline for assessing loading issues.
In future studies, the model will be calibrated against complete marker trial results, thus providing a better prediction of mineral production and material flow Power and Campbell, The Newcrest dilution model and SLC optimizer can be divided into a recovery model and a draw strategy optimization model Jamieson, In the study described above, the gold equivalent was used for calibration at Telfer and Ridgeway Deeps, as both mines produce copper and gold.
As mines generally have machines with different bucket sizes, the WOLIS system uses different X and Y values stored for the different machines.
More recently, bulk sampling has been done at Perseverance mine, albeit on rare occasions Booth et al.
A dynamic draw control strategy should be sensitive to the mine design and ore geometry. Mine seismicity is a constraint during operations and affects the sequence of mining in the mining blocks; the number of blasts in a particular mining block is limited to reduce seismicity. The Kiirunavaara orebody consists of magnetite ore with magmatic intrusions.
External thesis projects – Department of Information Technology – Uppsala University
Lkkab marker trials have provided important knowledge on flow behaviour and dilution behaviour and have been used for mine design and ore flow simulation in SLC mines. Internal report, Kiirunavaara mine, Sweden.
A new method based on production data or other mine-specific parameters for dilution entry and total dilution calculation needs to be developed. The model was calibrated against initial marker trial results at Ernest Henry mine, Australia.
The draw control factor is based on the variation in tonnage from working drawpoints. Other methods discussed would benefit significantly from either model improvement or improvement in drawpoint monitoring technologies.
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The curves are used to complement mine planning and scheduling. Mining-induced seismic events can be harmful to the infrastructure and buildings in the city near the mine; in some cases, they can pose a danger to the miners and the mine’s infrastructure.
The assessment shows that traditional draw control strategy, dilution entry method, and non-dilution methods are not recommended for mastef control purposes. Newcrest dilution model and SLC optimizer The Newcrest dilution model and SLC optimizer can be divided into a recovery model and a draw strategy optimization model Jamieson, The operator can see information related to ring location 1last bucket weight 2ring design 3extraction ratio ratio of the total tonnage of material loaded from the drawpoint to the estimated tonnage of the ring 4system status 5report status 6loading graph 7nearby charged holes 8ring information 9and extraction ratio of proximate rings