670 Table 3 – Ore Sorting Rehandling Costs Cost Value ($/t) Loading 1.36 Hauling 2.29 Services 0.24 Supervision 0.08 Rehandling Cost 3.97 Ore sorting plant cost: This cost is subdivided into fixed costs, variable costs, and sustaining costs. The fixed cost represents 75% of the ore sorting plant operating cost. Table 4 - Ore Sorting Plant Costs Cost Value ($/t) OS Plant Fixed Cost 2.30 OS Plant Variable Cost 0.39 Sustaining 0.33 OS Plant Cost 3.02 5.4 Ore Sorting Cut-off Grade Calculation To better understand the additional reserve quantification that the ore sorting process can provide, it is necessary to determine the cut-off grade associated with the ore sorting process. Therefore, based on the parameters and costs related to the sorting process, the following analysis is proposed to determine the cutoff grade. ● Quantify the costs associated with the product, preconcentrated material, and the reject, waste product from the OS plant. ● For the processing cost of the product, the total ore sorting process cost and processing and G&A costs must be considered. Therefore, the associated cost is 11.70 $/t. ● In the case of reject processing, only the costs of the ore sorting process, rehandling and OS plant, must be considered. Therefore, the associated cost is 7.00 $/t. ● Considering the costs, preconcentrate 11.70 $/t, waste 7.00 $/t, and the mass recovery, 40.8% and 59.2%, weighted according to the mass pull of the preconcentrate, a cut-off grade is obtained which, when divided by the upgrade ratio of the highest-value metal, Cu, defines the cut-off grade. Based on the points mentioned above, the following cut-off grade calculation structure is detailed in the table below:
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