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Adequate drainage system design for heap leaching structures.

Abbas Majdi1, Mehdi Amini, Saeed Karimi Nasab

  • 1School of Mining Engineering, University College of Engineering, University of Tehran, Iran. amajdi@ut.ac.ir

Journal of Hazardous Materials
|February 27, 2007
PubMed
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This study presents an optimized heap leach drainage system design, enhancing mine safety and economics. It addresses acid level increases and pore pressure to prevent heap slides, crucial for environmental protection.

Area of Science:

  • Mining Engineering
  • Geotechnical Engineering
  • Environmental Engineering

Background:

  • Heap leaching operations can experience increased acid levels, leading to operational issues.
  • Elevated pore acid pressure in heaps poses a significant risk of heap-slides, endangering the mine environment.
  • Effective drainage system design is critical for mitigating these risks and improving hydrometallurgical processes.

Purpose of the Study:

  • To develop an optimum design for a heap leaching drainage system.
  • To evaluate factors influencing acid level increases and pore acid pressure.
  • To propose a method for calculating drainage layer thickness and auxiliary pipe diameters.

Main Methods:

  • Determining gravelly drainage layer thickness using empirical equations.

Related Experiment Videos

  • Calculating internal diameter for slotted polyethylene pipes, considering overburden pressure and pipe deformation.
  • Applying the proposed design to a heap structure at Sarcheshmeh copper mine.

    • Main Results:

    • An optimized drainage system design was developed for heap leaching structures.
    • The design accounts for factors contributing to increased acid levels and pore pressure.
    • Calculated results were compared with existing equations, validating the proposed approach.

    Conclusions:

    • The proposed drainage system design positively impacts mine environment and economics.
    • Proper drainage design is essential for preventing heap-slides and ensuring operational stability.
    • The study provides a practical approach for designing effective heap leach drainage systems.