875 filtration process was also carried out, obtaining results like those obtained with whole tailings filtration. Besides, it was determined that four transfer points (chutes) are necessary to achieve mixture homogenization. Furthermore, as part of the development of the Pre Pilot Plant, segregation tests were conducted on slopes13 with characteristics like those of an existing waste dump (discharges were done using trucks of 20 m3). 3.2.2 Mesoscale columns Eighteen mesoscale columns were constructed to observe the long-term geotechnical and geochemical behavior of the waste rock-tailings mixtures. These mesoscale columns store pure M1 and M4 cycloned tailings (2), intrusive “A” and pure marble “C” waste rock (2), and cycloned waste rock-tailings mixtures in ratios of 4:1 and 7:1 (14). Instruments for measuring pressure, oxygen percentage, moisture percentage, flow rate, and sampling of leachate for chemical analysis and evaluation of acid mine drainage production were installed in each mesoscale column during filling to achieve the objectives described. The operation lasted almost three years till December 2025, as all measured parameters achieved a constant value or trend that was repeated in every season (dry and wet). These parameters were included in the PFS, and the update of the Yanacancha waste rock dump geochemical model determining the water quality was similar to that of the waste rock alone dump site. Figure 3 – Instrumented Mesoscale columns 3.2.3 Large Diameter Kinetic Testing - Phase 1 (Canada) Specialized geotechnical studies, conducted in laboratories in Canada and the United States, were performed to characterize the mixtures by determining their mechanical properties, such as strength, hardness, hydraulic conductivity, pore pressure, permeability, and liquefaction potential, among others. Likewise, geochemical studies were conducted to characterize the mixtures (PAG and NPAG) and to determine the quality of the leachate produced at the laboratory level through static and dynamic tests (Large Diameter Kinetic Testing - LDKT) using materials, tailings technology, and mixing ratios similar to those of the mesoscale columns. 13 Areas of 5 m (width) x 10 m (height) and 37° (slope)
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