1043 Figure 7 – Type C3 cover. 2.4.2 Unified Waste Rock Dump The Unified Waste Rock Dump is located on steeply sloping undulating hillsides, with a maximum height of 45 m for Zone 1, 33.7 m for Zone 2, and 15.6 m for Zone 3, with a slope varying between 27° and 30°, composed of overburden material consisting of fragments of tonalite and sandstone rocks in a sandyclay matrix. The Unified waste rock dump is classified according to the Unified Soil Classification System (SUCS) as poorly graded silty gravel (GP-GM), non-plastic, dense, and with a moisture content varying between approximately 4% and 7%. This waste rock dumps accumulated materials from different mine clearings, cut materials from the pit, adjacent waste materials from the hopper, and material from the demolition of infrastructure. Geochemical Stability Geochemical stability was ensured by covering the overburden materials to prevent contact with water and thus the generation of acid drainage. To this end, two types of cover were used (Type C3 and Type C4). Figure 8 –Type C3 cover.
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