Guidelines for designing a new draw control strategy. The model was calibrated against initial marker trial results at Ernest Henry mine, Australia. Loading from the muckpile should be stopped during the sampling period in order to ensure a representative sample. Thereafter, the selected cells’ weight contribution is assigned to the closest suitable production ring Salinas, As production advances, the flat front pattern changes to a V-shape. As a result, loading is stopped when an opening is encountered at the drawpoint because of a gap between the muckpile and the drift roof. Laboratories were set up close to the centres of production, returning assay results within half an hour of sampling using standard sample preparation equipment and a portable isotope fluorescent X-ray analyser Hancock and Mattson,
The paper enumerates the loading criteria and loading constraints at the mines and outlines details of mine design, layout, and geology affecting the draw control. Smith and Rahal state that draw control incorporates the sequencing and scheduling of development, production, and the material handling system, with the dual and contradictory objectives of minimizing mining costs and dilution. This causes problems when material is being loaded onto the train from the orepasses and is handled either by blasting or by using water jets. The density-based method is used when there is a significant difference in the density of ore and waste. The non-uniform nature of material flow in SLC requires constant monitoring to control dilution while also recovering more ore at the drawpoint. Loading criteria are a set of rules and guidelines that control the loading and closing of drawpoints in SLC. Grade control is guided by the overall average run-of-mine grade and the shut-off grade for material loading at the drawpoint.
Other methods discussed would benefit significantly from either model improvement or improvement in drawpoint monitoring technologies. For the last drawpoint of a production drift, the second phase of loading, known as ‘restmalmslastning’ residual ore loadingis sometimes done by reopening the closed tbesis to recover known ore remnants.
The method uses a series of Datamine macros to ,aster the expected diluted grade for a series of rings Allman,in Jamieson, The purpose is to provide information about the ore grade being loaded.
The density-based method is used when there is a significant difference in the density of ore and waste. Introduction A consistent issue in sublevel caving SLC operations is the regulation of loading at the drawpoints, especially as the decision to stop loading from a particular drawpoint and blast the next ring is irreversible. Grade control is guided by the overall average run-of-mine grade and the shut-off grade for material loading at the drawpoint.
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A model for gravity flow of fragmented rock in block caving mines. Draw control strategies based on ore flow prediction models suffer from a lack of complete knowledge of the chaotic and random nature of material flow.
Draw control strategy at Kiirunavaara mine Kiirunavaara mine is the largest underground iron ore operation in the world. Some orebodies in Malmberget contain waste intrusions.
The non-uniform nature of material flow in SLC requires constant monitoring to control dilution while also recovering more ore at the drawpoint. A draw control strategy can use this information to reduce dilution and improve ore recovery. Modeling granular flow in caving mines: Smith and Rahal state that draw control incorporates the sequencing and scheduling of development, production, and the material handling system, with the dual and contradictory objectives tehsis minimizing mining costs and dilution.
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Masster minimum distance of 30 m is maintained between production faces for two levels, such that the lower production level lags the upper production level by a distance of 30 m. Boeg-Jensen II ; L.
Internal report, Kiirunavaara mine, Sweden. It will give SLC mines the flexibility to change their production strategy to better align with production demands and metal prices. Ore recovery was calculated for different sublevels. Sublevel cave practices thesid the Frood-Stobie Complex.
This is a separate process; it assumes that heavy finer ore flows faster than caved material Kvapil, and accumulates at the bottom of the caved material. The table does not, however, comment on the validity of the factors. Mining constraints for draw control.
Kiirunavaara mine is the largest underground iron ore operation in the world. Draw control strategies The issue of when to stop loading from the drawpoint and blast the next ring is at lmab centre of draw control strategies Sarin, When a thesls is encountered at the drawpoint, it is initially handled by the LHD operator.
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. The mining sequence is also changed if mining-induced seismicity occurs. The orebody is first divided into cells. The issue of when to stop loading from the drawpoint and blast the next ring is at the centre of draw control strategies Sarin, As production advances, the flat front pattern changes to a V-shape.
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XRF, spectroscopy must be developed to monitor ,kab grade for copper, gold, or other metals being mined using caving operations. To achieve its production target, Malmberget mine needs 11 active production areas in the eastern fields and two to five in the western field.
Mining constraints for draw control In the initial mining sequence in a mining level at Kiirunavaara, the cave front is kept flat; i. Draw bin method The draw bin method was first implemented in a feasibility study at Telfer mine, Australia, and then used at Ridgeway Deeps, Australia Allman,in Jamieson,