Material handling cost: This is primarily subdivided into loading, hauling, services, and supervision costs, with loading being the most significant component, representing approximately 60% of the total material handling cost. For the calculation of hauling cost, an average haul distance value associated with the feeding and transport of ore sorting plant products, preconcentrate and waste, has been considered. 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 cut-off 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
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