How to Process Sulphide–Oxide Gold Ore in Iran？

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A recently reviewed Iranian ore displays a mixed sulphide–oxide gold system with notable Ag, Cu, Mn, and S. Head grades of 1.0–3.5 ppm Au are moderate but commercially attractive when paired with a disciplined flowsheet. To fast-track deployment and control costs, we propose a containerized CIL/CIP leaching plant.

gold leaching plant Iran - How to Process Sulphide–Oxide Gold Ore in Iran？

Why a containerized plant?

  • Accelerated delivery and commissioning through factory-built, pre-tested modules
  • Scalable capacity by adding containers as ore supply grows
  • Consistent quality, instrumentation, and safety standards
  • Compact footprint with reduced civil works—suited to remote sites

Ore characteristics and implications

  • Elevated S and Cu increase cyanide and lime consumption and can compete for carbon sites
  • Robust oxygenation is required to sustain leach kinetics in sulphidic matrices
  • Selective copper management (e.g., SART) can improve gold recovery and reduce OPEX

We recommend pre-production lab and pilot work to confirm:

  • Cyanide/lime consumption and target pH (10.5–11.0)
  • Leach kinetics versus grind size and oxygen regime
  • Copper and sulfur deportment
  • Carbon loading, fouling, and regeneration conditions
  • Detox requirements for tailings and effluent

  1. Crushing and milling
  • Primary crushing and ball milling to an optimized P80 of 75–106 μm, confirmed by kinetics testing
  1. Thickening
  • High-rate thickener to 40–50% solids by weight to reduce tank volume and enhance kinetics
  1. Cyanide leaching with carbon (CIL/CIP)
  • Controlled pH and cyanide addition with air/oxygen sparging
  • Approximate 48-hour residence to achieve the first batch of loaded carbon
  1. Carbon handling and gold recovery
  • Interstage screening, Zadra or AARL elution, electrowinning, and doré smelting
  • Carbon reactivation via kiln to maintain adsorption performance
  1. Copper and reagent management
  • Staged cyanide dosing and lime for stability and HCN suppression
  • SART where soluble copper is significant to precipitate Cu as sulfide and recycle cyanide
  • Lead nitrate dosing as warranted by testwork to accelerate kinetics
  1. Tailings and environmental stewardship
  • Tailings thickening and cyanide detox (SO2/air, peroxide, or Caro’s acid)
  • Monitoring of WAD cyanide and residual Cu to meet environmental standards

Containerized plant configuration

  • ISO-container modules for:
    • Crushing–milling and classification
    • Thickening with flocculant preparation
    • Leach/CIL/CIP tankage with agitators and interstage screens
    • Elution–electrowinning–smelting
    • Reagents, water, air/O2, MCC/PLC controls
    • Optional assay lab and carbon regeneration
  • Site needs: level pad, power, raw water, kiln/boiler fuel, and compliant tailings storage

Performance snapshot

  • Head grade: 1.0–3.5 ppm Au (rock gold)
  • Leach density: 40–50% solids by weight
  • Residence: ~48 hours to first carbon harvest; finalize via pilot testing
  • Expected recovery: typically 75–90% with proper grind, oxygenation, and copper control

Testwork program

  • Mineralogy (QEMSCAN/MLA), head assays (Au, Ag, Cu, S, Fe, Mn)
  • Grind–leach optimization across PSD bands
  • Reagent screening for cyanide, lime, oxygen, lead nitrate
  • Carbon isotherms and fouling/attrition assessment
  • SART amenability and detox verification

containerized CIL - How to Process Sulphide–Oxide Gold Ore in Iran？

Why Dasen Mining?

  • Over 30 years in gold recovery with international project delivery
  • Proven containerized CIL/CIP plants tailored to mixed sulphide–oxide ores
  • End-to-end support: sampling, lab/pilot, flowsheet design, manufacturing, installation, commissioning, and operator training
  • Ongoing optimization: reagent audits, carbon management, and remote monitoring?

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