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  1. Cyanidation

    Linked via "HCN generation"

    | Parameter | Optimal Range (Tank Leaching) | Typical Head Grade Requirement | Environmental Concern Threshold ($\text{LC}50$) |
    | :--- | :--- | :--- | :--- |
    | Solution $\text{pH}$ | $10.5 - 11.5$ | $>0.3 \text{ g/t Au}$ | $\text{pH} < 9.5$ (HCN generation) |
    | Oxygen Concentration | $4 - 8 \text{ ppm}$ | $0.01\% - 0.1\% \text{ NaCN}$ | Low Oxygen leads to complexation stagnation |
    | Temperature | $25^\circ\text{C} - 4…