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Mining and processing activities in Zimbabwe and some thoughts on mining the Great Dyke.

Mining and processing activities in Zimbabwe and some thoughts on mining the Great Dyke. Dr Michael Roberts, TWP SAIMM Zimbabwe Branch May 2010 . Who are we?. Who are we?. What do we do?. A generic description of some project work undertaken in Zimbabwe by TWP. Activity.

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Mining and processing activities in Zimbabwe and some thoughts on mining the Great Dyke.

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  1. Mining and processing activities in Zimbabwe and some thoughts on mining the Great Dyke. Dr Michael Roberts, TWP SAIMM Zimbabwe Branch May 2010

  2. Who are we?

  3. Who are we?

  4. What do we do? A generic description of some project work undertaken in Zimbabwe by TWP.

  5. Activity Pickstone-Peerless hydrothermal gold deposits.

  6. Location

  7. Activity Pickstone-Peerless hydrothermal gold deposits. A plant will be built on site to treat a sulphide dump. Later there might be consideration given to going underground.

  8. Activity Unki declines on the Great Dyke.

  9. Activity

  10. Activity Unki declines on the Great Dyke. Declines completed.

  11. Activity Evaluating and assisting with respect to efficient Chrome mining associated with the Great Dyke.

  12. Activity Optimise mining and process engineering on the Great dyke with respect to Platinum group elements. How done. Optimise mineralogy, mining and process engineering by recognising that the ore body is not homogeneous.

  13. The Bushveld complex

  14. The Great dyke

  15. Mining on the Bushveld and Great dyke There might be some commonality with respect to structure in the Bushveld and the Great Dyke.

  16. Easy mining on the Great Dyke

  17. Easy mining on the great dyke

  18. Easy mining on the Great Dyke

  19. Easy mining on the Bushveld

  20. Difficult mining on the great dyke

  21. Difficult mining in the Bushveld

  22. Great dyke Some commonality with respect to structure in the Bushveld and the Great Dyke. Flexural slip thrust faults.

  23. Flexural slip thrust fault

  24. What is a flexural slip thrust fault? Flat Ramp Ore body Flexural slip thrust fault Flat Section

  25. Flexural slip thrust fault Ramp Flat

  26. Flexural slip thrust fault on the Great Dyke ?????

  27. Flexural slip thrust fault - origins

  28. Flexural slip thrust fault - origins

  29. Flexural slip thrust fault - origins

  30. Flexural slip thrust fault - origin

  31. S. Perritt and M.K.C. Roberts “Flexural-slip structures in the Bushveld Complex, South Africa?”Journal of Structural Geology, Volume 29, Issue 9, September 2007, Pages 1422-1429. S. Perritt and M.K.C. Roberts “Flexural-slip structures in the Bushveld Complex, South Africa?”Journal of Structural Geology, Volume 29, Issue 9, September 2007, Pages 1422-1429. Scientific description of a flexural slip thrust fault Part of the Platmine Research Programme funded by: Anglo Platinum Impala Platinum Lonmin Peer reviewed scientific paper referenced: S. Perritt and M.K.C. Roberts “Flexural-slip structures in the Bushveld Complex, South Africa?”Journal of Structural Geology, Volume 29, Issue 9, September 2007, Pages 1422-1429.

  32. Fall of ground fatalities over a set period Breakdown as to cause of 32 fall of ground fatalities

  33. Pillar failure due to gouge on flexural slip thrust fault

  34. Pillar failure due to gouge on flexural slip thrust fault Gouge

  35. Pillar failure due to gouge on flexural slip thrust fault

  36. Understanding the structures • Understanding geological structures within the ore body. • Rock mass ratings. • Rock strengths • Mining method. • Appropriate mining span • Excavation support Knowledge gap Rock engineering Mining engineering Structural geology

  37. Understanding the structures • Understanding geological structures within the ore body. • Rock mass ratings. • Rock strengths • Mining method. • Appropriate mining span • Excavation support Knowledge gap Rock engineering Mining engineering Structural geology Expect surprises and production disruptions

  38. Understanding the structures • Understanding geological structures within the ore body. • Rock mass ratings. • Rock strengths • Mining method. • Appropriate mining span • Excavation support No knowledge gap Rock engineering Mining engineering Structural geology Expect smoother production profile

  39. TWP Plant Design Example

  40. Thank you

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