874 Additionally, the preliminary design of mesoscale columns was defined to analyze the long-term geochemical-geotechnical behavior using the material produced by the Pre Pilot Plant. 3.2 Pre-Feasibility Stage – Gate 2 As part of the development of the Pre-Feasibility Study, based on Antamina's project management guidelines, the following activities are included: 3.2.1 Pre-Pilot Plant The Pre-Pilot Plant consisted of two areas: ● Tailings dewatering area. This area included three dewatering technologies: thickening (deep-cone thickener), cyclone screening, and filtration (filter press). Figure 1 – Dewatering area – Pre Pilot Plant ● Mixing area. This area had a mobile crushing and waste rock classification station and a conveyor belt system with chutes (four belts) to mix the waste rock and tailings at the defined mixing ratios for subsequent stacking. Figure 2 – Mixing area – Pre Pilot Plant Satisfactory results were obtained regarding tailings dewatering, particularly with cyclone - screening dewatering, achieving an average moisture content of 15% and a 65% split. Likewise, the fines
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