Mining and processing activities in Zimbabwe and some thoughts on mining the Great Dyke.
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ProjectsTHE BASIL READ GROUP
Mining and processing activities in Zimbabwe and some thoughts on mining
the Great Dyke.
Dr Michael Roberts, TWP
SAIMM Zimbabwe Branch May 2010
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Who are we?
Basil Read
Construction
Buildings
Roads
Civils
Mining Developments Engineering
Basil Read Engineering
TWP
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Who are we?
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A generic description of some project work undertaken in Zimbabwe by TWP.
What do we do?
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Pickstone-Peerless hydrothermal gold deposits.
Activity
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Location
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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.
Activity
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Unki declines on the Great Dyke.
Activity
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Activity
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Unki declines on the Great Dyke.
Declines completed.
Activity
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Activity
Evaluating and assisting with respect to efficient Chrome mining associated with the Great Dyke.
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Activity
Optimise mining and process engineering on the Great dyke with respect to Platinum groupelements.
How done.
Optimise mineralogy, mining and process engineering by recognising that the ore body is not homogeneous.
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The Bushveld complex
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The Great dyke
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There might be some commonality with respect to structure in the Bushveld and the Great Dyke.
Mining on the Bushveld and Great dyke
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Easy mining on the Great Dyke
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Easy mining on the great dyke
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Easy mining on the Great Dyke
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Easy mining on the Bushveld
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Difficult mining on the great dyke
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Difficult mining in the Bushveld
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Some commonality with respect to structurein the Bushveld and the Great Dyke.
Flexural slip thrust faults.
Great dyke
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Flexural slip thrust fault
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What is a flexural slip thrust fault?
Ore body
SectionFlexural sl
ip thrust f
ault
Flat
Flat
Ram
p
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Flexural slip thrust fault
FlatRam
p
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Flexural slip thrust fault on the Great Dyke ?????
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Flexural slip thrust fault - origins
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Flexural slip thrust fault - origins
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Flexural slip thrust fault - origins
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Flexural slip thrust fault - origin
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Scientific description of a flexural slip thrust fault
Part of the Platmine Research Programme funded by: Anglo PlatinumImpala PlatinumLonmin
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.
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.
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Fall of ground fatalities over a set period
Curved joint moved as a precursor to fall of ground
Thrust fault or curved joint directly fell on deceased
Seismic causes
Other reasons for fall of ground
9/32 15/32 2/32 6/32
Breakdown as to cause of 32 fall of ground fatalities
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Pillar failure due to gouge on flexural slip thrust fault
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Pillar failure due to gouge on flexural slip thrust fault
Gouge
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Pillar failure due to gouge on flexural slip thrust fault
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Understanding the structures
• Understanding geological structures within the ore body.
• Rock mass ratings.• Rock strengths
• Mining method. • Appropriate mining span• Excavation support
Structural geology Rock engineering Mining engineering
Knowledge gap
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Understanding the structures
• Understanding geological structures within the ore body.
• Rock mass ratings.• Rock strengths
• Mining method. • Appropriate mining span• Excavation support
Structural geology Rock engineering Mining engineering
Knowledge gap
Expect surprises and production disruptions
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Understanding the structures
• Understanding geological structures within the ore body.
• Rock mass ratings.• Rock strengths
• Mining method. • Appropriate mining span• Excavation support
Structural geology Rock engineering Mining engineering
Expect smoother production profile
No knowledge gap
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TWP Plant Design Example
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Thank you