Similarly, the route that is from the same dump, dump entry as the previous selected route to the reactive-rock- allowed dump location in the ‘dump entry to dump location’ distance table can be selected. That is, if there is a reactive waste block that is extracted from pit A to pit exit A_1 in the ‘pit block to pit exit’ distance table, only can the route that is from pit A and pit exit A_1 to main dump (main dump is the dump can accommodate reactive rock) in ‘pit exit to dump entry’ distance table be selected as the downstream route. The preselection of the rock haulage route is necessary, which is based on the data in the generated distance fi les (Table 1), and follow the rule that is illustrated in Figure 6. Thousands of blocks in the pit and dump and multiple pit exits and dump entries in the problem will result in millions of possible material haulage routes, and each route represents a variable. This interface can discriminate ore, low-grade material and waste and transport them to the ROM, LGSP and waste dump respectively, and force the PAF rock to the centre of the waste dump and use inert rock for the encapsulation. There are two stages in the procedure of the model construction: possible haulage routes (variables) generation and model generation. The model construction is the core of the interface, which aims to construct the mathematical model using the previously generated distance data in Access tables and other necessary information (Figure 5). The detailed data included in the resulting distance table is summarised in Table 1. To assist the operator generating the MIP model in the next step, the interface allows users to transfer the data from the text fi le to the Access Database table, as shown in Figure 4. The previously generated distance data are stored in the text fi le. can select the text fi le to store the resulting distance data and click the calculate button to complete distance calculation.
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