The Stability Graph for Open Stope Design;

How to Use the Method Correctly

Name:Winthrop Professor Yves Potvin

Australian Centre for Geomechanics, Australia

DateJune, Sunday 8th, 2014

Time08.30 to 17.30

Summary

This one day course will focus on how to use the stability graph empirical method to design open stopes in hard rock metal mines. This method is often applied at the feasibility study stage of a mine and, as such, some very important general design concepts, applicable to open stope mining, will be reviewed (Section 2). The stability graph method relies on the modified Q’, rock mass classification index, as a key input parameter. It is the instructor’s experience that large inaccuracies can be introduced in the design during data collection. Practical tips will be given to avoid such errors (Section 3).

The stability graph method will be explained in detail, and practical exercises will be given to ensure that attendees develop the skills to use the method correctly (Section 4).

Practical mine planning issues such as blast design, fill exposure stability, mining sequence, etc., and how they relate to open stope stability will be discussed (Section 5).

If time allows, the instructor will share his experience in applying the stability graph method to feasibility studies by presenting a number of case studies.

Course Outline

  1. Course introduction
  2. Open stope mining methods and design concepts
  3. Key design decisions: risk versus profits
  4. Open stope mining options
  5. Mining sequences
  6. Rock mass classification for open stope design
  7. Practical tips and traps when using rock mass classification for open stope design
  8. The stability graph method
  9. The original method and subsequent variations
  10. Practical exercises on how to use the method
  11. Cable bolt design using the stability graph method
  12. Practical exercises on how to design cable bolt support for stopes
  13. Controlling dilution
  14. Stope stability issues
  15. Blasting control
  16. Fill dilution
  17. Mine planning issues
  18. Application of the stability graph method
  19. Feasibility studies
  20. Case studies

Notes:

  • Registration for this short course and the 1st International Conference on Applied Empirical Design Methods in Mining are separate.
  • Limited spaces available.
  • Simultaneous translation (English-Spanish).
  • Short course registration fees include: course notes, participation certificate and refreshmentbreaks.
  • Courseis subject to cancellation if insufficient delegate numbers are received.
  • Delegates to bring along a simple calculator.