36 • Cement dosage ≈ 4 % of filtered tailings (≈65 kg/m³), • Water content ≈ 500 L/m³. This mix reliably met the mine’s UCS criteria and pumpability requirements but implied high cement and water consumption. Table 1 – XRD analyses of Cerro Lindo tailings Mineral Chemical composition Percentage, % (*) Quartz SiO2 32.0 Pyrite FeS2 28.0 Plagioclase (Oligoclase) (Na,Ca)(Al,Si)4O8 12.0 Mica (Muscovite) Feldspar (Orthoclase) Chlorite (Clinochlore) Mica (Biotite) Barite Pyrrhotite Calcite Kaolinite Amphibole (Actinolite) KAl2(Si3Al)O10(OH,F)2 KAlSi3O8 (Mg,Fe)5Al(Si3Al)O10(OH)8 K(Mg,Fe)3[AlSi3O10(OH,F)2] BaSO4 Fe1-xSx CaCO3 Al2Si2O5(OH)4 Ca2(Mg,Fe)5Si8O22(OH)2 8.0 5.0 4.0 4.0 3.0 < L.D. < L.D. < L.D. < L.D. *L.D. = Limit of detection below 2%
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