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Compliance für natürliche Ressourcen 12 Punkte

Heap Leach Cyanide Management & Destruction Checklist

Diese Checkliste ist auf Englisch.

Verify solution containment, cyanide destruction/detoxification, and closure controls for a gold or silver heap-leach operation using cyanide, consistent with the International Cyanide Management Code.

International Cyanide Management Code40 CFR 261ASTM D7237State Cyanide Regulations

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Containment & Solution Management

  • Are leach pads, ponds, and process solution channels equipped with liners and leak-detection/collection systems to prevent release? *
  • Is adequate freeboard and storm-event storage capacity maintained in solution ponds to prevent overtopping? *
  • Are process solutions kept within the design operating range to avoid uncontrolled discharge? *

Cyanide Handling & Worker Safety

  • Is cyanide unloaded, mixed, and stored using engineered systems that prevent HCN gas formation and worker exposure? *
  • Is solution pH maintained sufficiently alkaline (protective alkalinity) to minimize HCN gas evolution? *
  • Are HCN gas monitoring, cyanide antidote, and emergency response provisions available where cyanide is handled? *

Cyanide Destruction & Detoxification

  • Is a cyanide destruction process (e.g., SO2/air, hydrogen peroxide, or INCO) applied to detoxify solutions and tailings before discharge or disposal? *
  • Is weak-acid-dissociable (WAD) cyanide monitored to confirm it is reduced below the applicable discharge or storage threshold? *
  • Record the WAD cyanide concentration of the treated solution (mg/L). *

Wildlife Protection & Closure

  • Are open-water cyanide concentrations kept below 50 mg/L WAD or otherwise mitigated to protect wildlife and birds? *
  • Is a heap and pond rinse/detoxification plan in place for closure to neutralize residual cyanide? *
  • Are cyanide monitoring and destruction records retained to demonstrate compliance? *

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