Algorithm to automatically quantify power law accelerated seismic release
|
|
Review
Data analysis
|
GAP 412
|
A new methodology to determine the effectiveness of grouted support
|
kR 320
|
|
|
|
|
|
|
|
|
|
Project cancelled
|
GAP 414
CD #4
|
A reference work of current rock engineering knowledge
AJ Jager & JA Ryder (eds). TO Hagan, G York, F Vieira, RG Gurtunca, RA Johnson, DJ Adams, SM Spottiswoode, A Daehnke, MKC Roberts, AT Haile, RJ Durrheim, AP Squelch, N Lightfoot (CSIR), MU Ozbay (Wits U), GS Esterhuizen (Pretoria U), R More O’Ferrall (consultant), D Arnold (Avmin), AJ Mendecki, G van Aswegen, P Mountfort (ISSI)
|
??-99
371 pp.
kR 1540
|
G/P
|
Rockfalls
Rockbursts
|
|
Geology
Rock mechanics
Seismology
|
Layouts
Support
|
|
Textbook
|
|
|
Review
|
GAP415
CD #2&3
|
Numerical Modelling of Mine Workings
N Lightfoot & MJ Maccelari (CSIR)
|
04-99
46p.
kR 990
|
ALL
|
All
|
|
Rock mechanics
Computational methods
|
Layouts
|
|
Handbook
|
|
|
Review
Numerical modelling
Back analysis
|
GAP 416
CD 2&3
|
A methodology for the definition of geotechnical areas within the South African gold and platinum stoping horizons
G Güler, G Quaye, AJ Jager, JK Schweitzer, M Grodner, N Reddy, L Andersen, A Milev, T Wallmach (CSIR)
|
12-98
69p +
133p. App.
kR 1040
|
G/P
|
Rockfalls
Rockbursts
|
|
Geology
Rock mechanics
|
Layouts
Support
|
|
Methodology for defining Regional Geotechnical Areas and Ground Control Districts
|
|
|
Review
U/g observations
Workshops
Data analysis
Back analysis
|
GAP 420
CD #2&3
|
Virtual Reality Simulators for Rock Engineering related training
AP Squelch (CSIR)
|
12-97
49p.
kR 290
|
ALL
|
Rockfalls
Rockbursts
|
|
|
|
Hazard id
Causes of accidents
Training
|
Software for virtual reality demo system
|
|
|
Software development
|
GAP 423
CD #2&3
|
Testing of tunnel support: Dynamic load testing of rockbolt elements to provide data for safer support design
WD Ortlepp & TR Stacey (SRK)
|
06-98
??
kR 400
|
G/P
|
Rockbursts
|
|
|
Support (tunnels)
|
|
Report
Methodology for dynamic testing of tendons
|
|
|
Review
Lab tests
|
GAP 442
CD #2&3
|
Problems associated with the use of Rapid Yielding Hydraulic Props
FJ Glisson & DH Kullmann (CSIR)
|
08-98
73p. +
9p.Guideline
kR 160
|
G
|
Rockbursts
|
|
|
Support (stopes)
|
Training
|
Report
|
X
|
|
Review
|
GAP 508
CD #2&3
|
Performance specifications for pack support types to cater for the variety of geotechnical areas encountered in the mining industry.
DH Kullmann (CSIR)
|
03-99
51p.
kR 545
|
G/P
|
Rockfalls
Rockbursts
|
|
|
Support (stopes)
|
|
Report
Methodology for testing of packs
Data base of pack performance
Support Catalogue revised
|
|
|
Review
Lab tests
|
GAP511b
CD #2&3
|
Evaluation and upgrading of records of stress measurement data in the mining industry
TR Stacey & J Wesseloo (SRK)
|
06-98
53p.
kR 368
|
ALL
|
Rockbursts
|
|
Tectonics
Rock mechanics
|
|
|
Data base of in situ stress measurements
|
|
|
Review
|
GAP513
CD #2&3
|
Guideline for probability based stope support design
SRK
|
05-00
20p.
kR 211
|
G/P
|
Rockfalls
Rockbursts
|
|
Rock mechanics
Computational methods
|
Support (tunnels and stopes)
|
|
Guideline
|
|
|
Review
Theoretical analysis
|
GAP516
CD #2&3
|
Further validation of bracket pillar design methodology
F Vieira, T Dede, R Stewart & A Ruskovich (CSIR)
(continuation of GAP 223)
|
07-98
118p.
kR 580
|
G/P
|
Rockbursts
|
|
Geology
Rock mechanics
Seismology
|
Layouts (stabilizing pillars)
|
|
Methodology to design bracket pillars
|
|
|
Review
U/g observations
Numerical modelling
Back analysis
|
GAP517
CD #2&3
|
Quantification of seismic hazard from seismic events in mines
A Kijko (Council for Geoscience)
|
12-98
10p.
kR 538
|
G/P
|
Rockbursts
|
|
Seismology
Computational methods
|
|
|
Software to assess seismic hazard
Training course
|
|
|
Review
Theoretical analysis
Data analysis
|
GAP524
CD #2&3
|
A study of rockburst source mechanism
WD Ortlepp (SRK)
|
06-00
42p.
kR 85
|
G
|
Rockbursts
|
|
Rock mechanics
Seismology
|
|
|
Report
|
|
|
U/g observations
Lab tests
|
GAP530
CD #2&3
|
Improvement of worker safety through the investigation of the site response to rockbursts
TO Hagan, AM Milev, SM Spottiswoode, B Vakalisa & N Reddy (CSIR)
(Continuation of GAP 201)
|
01-99
146p.
kR 1911
|
G/P
|
Rockbursts
|
|
Geology
Rock mechanics
Seismology
|
Layouts
Support (tunnel and stope)
|
Hazard id
|
Report
|
|
|
U/g observations
U/g test
Data analysis
Back analysis
|
GAP601a
|
Experimental and theoretical investigations of mining induced fracturing and rock instability close to excavations
R Lynch & AJ Mendecki (ISSI)
|
12-02
113p.
kR 2781
|
G/P
|
Rockbursts
|
X
|
Rock mechanics
Seismology
|
Hazard identification
|
|
Report
Training
Device: ISSI Crack Counter
|
|
|
Theoretical analysis
U/g observations
Data analysis
Numerical modelling
|
GAP601b
CD #4&5
|
Experimental investigation of mining induced fracturing
JAL Napier, K Drescher, MW Hildyard, MO Kataka, DF Malan, EJ Sellers (CSIR)
|
03-02
kR 11271
|
G/P
|
Rockbursts
|
|
Rock mechanics
Seismology
Computational methods
|
|
|
Report
Software - extension of DIGS & WAVE
|
|
|
Lab tests
Computer simulation
|
GAP602
CD #4&5
|
Stope gully support and sidings geometry at all depths and at varying dip
K Naidoo, AR Leach, D Spencer (Itasca Africa (Pty) Ltd.)
|
08-02
208p. +
10p. App. +
42p. Guideline
kR 951
|
G/P
|
Rockfalls
Rockbursts
|
|
Rock mechanics
|
Support (gully)
|
|
Report
Guideline booklet
|
|
|
Review
Numerical modelling
|
GAP603
CD #3
|
The integration of seismic monitoring with numerical modelling
A J Mendecki & A Ilchev (ISSI); JAL Napier & EJ Sellers (CSIR)
|
06-01
122p.
kR 2953
|
G/P
|
Rockbursts
|
|
Seismology
Computational methods
|
Layouts
Hazard identification
|
|
Report
Software – extension of MAP3D, IDRM, Point Kernel & MINF
|
|
|
Review
Theoretical analysis
Seismic monitoring
Numerical modelling
Software development
|
GAP604
CD #4&5
|
Routine moment tensor inversion for design of stabilizing pillars
LM Linzer, BP Watson, JS Kuijpers & E Acheampong (CSIR)
|
03-02
kR 3121
|
G/P
|
Rockbursts
|
|
Geology
Rock mechanics
Seismology
Computational methods
|
Layouts
Stabilizing pillars
Hazard identification
|
|
Report
Software – moment tensor inversion toolbox
|
|
|
Review
Theoretical analysis
Seismic monitoring
Numerical modelling
Back analysis
Software development
|
GAP605
CD #2&3
|
Analysis of the processes which lead to potentially damaging seismic events associated with geological structures and highly stressed areas in extensively mined areas and old mines
G van Aswegen (ISSI)
|
??-02
kR 1580
|
G
|
Rockbursts
|
|
Geology
Rock mechanics
Seismology
Computational methods
|
Layouts
Stabilizing pillars
Hazard identification
|
|
Report
Methodology: quantification of seismic hazard associated with geological features
|
|
|
Review
Theoretical analysis
Seismic monitoring
Numerical modelling
Back analysis
Software develpmnt
|
GAP 606
CD #3
|
Support technologies for rockbursts and f o g in the immediate face area
A Daehnke, E Acheampong, N Reddy, KB le Bron & AT Haile (CSIR), H Kirsten, J Wesseloo, G le Roux (SRK)
|
03-00
kR 1780
|
G/P
|
Rockfalls
Rockbursts
|
|
Geology
Rock mechanics
|
Support (face area)
|
Risk assessment
|
Report
Tables: support types for geotechnical environments
Methodology: engineering design of face support systems
|
|
|
U/g observations
Theoretical analysis
Numerical modelling
Data analysis
|
GAP607
CD #4&5
|
Support for non-standard stope areas in the mining industry
AR Leach, K Naidoo, T Rangasamy, D Spencer (Itasca Africa (Pty) Ltd
|
12-02
122p +
44p. Booklet
kR 378
|
G/P
|
Risk assessment
|
|
Geology
Rock mechanics
|
Layouts
Support
|
|
Report
Methodology: identification of changing rock mass conditions
Guidelines: mining layout and support strategies
Booklet
|
|
|
Review
Practitioner survey
U/g observations
|
GAP608
CD #3
|
Survey and assessment of techniques used to quantify the potential for rock mass instability
A vZ Brink, TO Hagan, SM Spottiswoode & DF Malan (CSIR), SN Glazer, S Lasocki (Poland)
|
03-00
117p.
kR 1291
|
G/P
|
Rockbursts
|
X
|
Rock mechanics
Seismology
|
Hazard identification
|
Risk assessment
|
Report
Procedure: evaluating seismic risk
|
|
|
Review
|
GAP 609a
CD #3
|
Effective training methods in strata control for underground workers
RA Johnson, TO Hagan, AP Squelch, E Jaku (CSIR)
|
03-00
33 p.
kR 740
|
ALL
|
Rockfalls
Rockbursts
|
|
Geology
Rock mechanics
|
Support
Drilling & blasting
Making safe
Hazard identification
|
Training
|
Report
Matrix: training requirements, SAQA levels 1-4.
|
|
|
Review
|
GAP 609b
CD #3
|
Technology transfer and human interface in the gold and platinum sector
AN Venter (Anvitech)
|
04-00
42 p.
kR 670
|
G/P
|
All
|
|
|
|
Training
|
Report
|
|
|
Review
Survey of experts
|
GAP610
CD #3
|
Evaluation of the risk to underground mine personnel due to the rockmass response to continuous mining operations
G van Aswegen (ISSI)
|
11-01
??
kR 569
|
G/P
|
Rockbursts
|
|
Seismology
|
Mining systems (FULCO)
Hazard identification
|
Risk assessment
|
Report
|
|
|
Review
Theoretical analysis
Data analysis
|
GAP 611
CD #2&3
|
Dynamic testing of stope face support using a testing facility
WD Ortlepp (SRK)
|
08-00
33 p.
kR 1488
|
G/P
|
Rockbursts
|
|
|
Support (stope)
|
|
Report
Facility: dynamic testing of stope support
|
|
|
Design
Construction
Commissioning
Lab tests
|
GAP 612a
CD #3
|
The relationship between ERR, system stiffness parameters and seismic energy release for different geotechnical areas
R Lachenicht (ISSI)
|
02-01
71p + 17p. Addendum
kR 383
|
G/P
|
Rockbursts
|
|
Geology
Rock mechanics
Seismology
|
Layouts
Hazard identification
|
|
Report
Methodology: assessment of seismic hazard for various layouts
Guidelines: optimisation of mine layouts
|
|
|
Theoretical analysis
Data analysis
Numerical modelling
Back analysis
|
GAP 612c
CD #2&3
|
The Relationship between ERR, system stiffness parameters and seismic energy release for different geotechnical areas
SM Spottiswoode, J Napier, A Milev & F Vieira (CSIR)
|
04-00
49 p.
kR 383
|
G/P
|
Rockbursts
|
|
Rock mechanics
Seismology
|
Layout criteria (ERR)
Support (stope)
|
|
Report
Guidelines: application of ERR
|
|
|
Review
Back analysis
|
GAP613
CD #3
|
The impact of soft loading conditions on the performance of elongate support elements
A Daehnke, BP Watson, D Roberts, E Acheampong & M van Zyl (CSIR)
|
03-00
180 p.
kR 1550
|
G/P
|
Rockbursts
|
|
Geology
Rock mechanics
Seismology
|
Support (stope)
|
|
Report
Design charts: assess likelihood of keyblock rotation
Software: optimise support spacing in areas prone to keyblock rotation
|
|
|
Theoretical analysis
Lab tests
U/g observations
|
GAP 615
CD #4&5
|
Influence of regional pillars and backfill on local area and internal support
AP Squelch, AM Milev, E Acheampong, T Dlokweni, A Janse van Rensburg & BP Watson (CSIR)
|
11-01
130 p.
kR 3914
|
G/P
|
Rockfalls
Rockbursts
|
|
Geology
Rock mechanics
Seismology
|
Layouts
Support (regional and stope)
|
|
Report
Methodology: design of local support in vicinity of regional support
|
|
|
Numerical modelling
U/g observations
|
GAP 616
CD #3
|
Effect of repeated dynamic loading on tunnel support performance
G Guler, JS Kuijpers, L Wojno, A Milev & AT Haile (CSIR)
|
03-01
107p.
kR 1021
|
G/P
|
Rockbursts
|
|
Seismology
|
Support (tunnels)
|
|
Report
Methodology: design of fabric support for tunnels
|
|
|
Lab tests
U/g observations
|
GAP 617
|
Parameters for crush pillars, stable pillars and effective pillar height
DP Roberts, I Canbulat & JA Ryder (CSIR)
|
04-02
kR 1091
|
P
|
Rockbursts
|
|
|
Layouts
Pillars (yield & crush)
|
|
Report
|
|
|
Numerical modelling
|
GAP 622
CD #2&3
|
Identifying rock mass discontinuities in a cloud of seismic event foci
A Kijko & SJP Retief (Council for Geoscience), S Lasocki (Poland)
|
12-99
20p.
kR 204
|
G/P
|
Rockbursts
|
|
Seismology
Computational methods
|
|
|
Report
|
|
|
Review
Theoretical analysis
Data analysis
|
GAP 625
CD #2&3
|
Numerical modelling of mines - additional programs and design criteria
N Lightfoot & MJ Maccelari (CSIR)
Expansion of GAP 415. Hardcopy of report available from SIMPROSS
|
03-00
kR 540
|
ALL
|
Rockfalls
Rockbursts
|
|
Computational methods
|
Layouts
|
|
Guidebook: 3 volumes on CD-ROM
|
|
|
Numerical modelling
Back analysis
|
GAP 627
CD 2&3
|
Preliminary Investigation into the zone of support influence and stable span between support units
A Daehnke, KB le Bron & M van Zyl (CSIR)
|
01-00
174p.
kR 570
|
G/P
|
Rockfalls
Rockbursts
|
|
Rock mechanics
|
Support systems (stope)
|
|
Report
Methodology: quantify zone of influence associated with hangwall beams
Design procedure: integrating tributary area, zone of influence & keyblock approaches
|
|
|
Theoretical analysis
Numerical modelling
|
GAP 629
CD #2&3
|
Numerical modelling of mines workings - annual update 1999/ 2000
(See GAP 415 and GAP 625)
|
09-99
13p.
kR 200
|
ALL
|
Rockfalls
Rockbursts
|
|
Computational methods
|
Layouts
|
|
Report
Internet web site: contains info on currently available software packages and freeware
|
|
|
Numerical modelling
Back analysis
|
GAP 630
CD #2&3
|
Stope support database maintenance
|
kR 50
|
ALL
|
|
|
|
|
|
|
|
|
|
GAP 632
|
Software maintenance of stope support design methodology software
|
kR 38
|
ALL
|
|
|
|
|
|
No report as output
|
|
|
|
GAP 633
CD #4&5
|
A textbook on rock mechanics for tabular hard rock mines
AJ Jager & JA Ryder (eds), DF Malan, L Andersen, G York, AP Squelch, A Daehnke, MKC Roberts, EJ Sellers, N Lightfoot, MW Hildyard (CSIR),
OD Goldbach (Snowden), MU Ozbay (Wits U)
|
2002
489 pp
kR 1560
|
G/P
|
Rockfalls
Rockbursts
|
|
Geology
Rock mechanics
Seismology
|
Layouts
Support
|
Training
|
Textbook
|
|
|
Review
|
GAP 641
CD #3
|
Workshops around the Pillar System Design computer program produced in SIMRAC project GAP 334
G York (CSIR)
|
03-00
31p.
kR 38
|
G/P
|
|
|
|
|
Training
|
Workshops: training in use of pillar design methodology and software
|
|
|
Technology transfer
|
GAP 642
|
Design and develop a quiet, self-thrusting blast hole drilling system
RW Otterman & NDL Burger (Pretoria U)
See GAP 702 below
|
kR 1040
|
ALL
|
Rockbursts
Rockfalls
Noise
|
|
|
Drilling
|
|
|
|
|
|
GAP 702
|
Develop tele-controls for self-thrusting percussion drilling
RW Ottermann, AJ von Wielligh, NDL Burger (Pretoria U), VA Kononov (CSIR)
|
58p.
10-01
kR 892
|
ALL
|
Rockbursts
Rockfalls
Noise
|
|
|
Drilling
|
|
Experimental development model (XDM): tested and demonstrated
|
|
|
Review
Functional analysis
Conceptual & detailed designs
XDM surface tests
|
GAP 705
CD #3
|
The feasibility of a mine-wide continuous closure monitoring system for gold mines
DF Malan, VA Kononov, SJ Coetzer, AL Janse van Rensburg & BS Spottiswoode (CSIR)
|
10-00
48p.
kR 400
|
G/P
|
Rockfalls
Rockbursts
|
X
|
Rock mechanics
|
Support systems
Hazard identification
|
|
Report
Device: conceptual design of closure meter with radio link
|
|
|
U/g observations
Numerical modelling
U/g tests
|
GAP 706
CD #2&3
|
Pre-feasibility investigation of infrared thermography for the identification of loose hangingwall and impending falls of ground.
VA Kononov (CSIR)
|
10-00
26 p.
kR 171
|
G/P
|
Rockfalls
Rockbursts
|
X
|
|
Support systems
Hazard identification
|
|
Report
|
|
|
Theoretical analysis
U/g tests
|
GAP 707
CD #4
|
Understanding and determining the variability of the primitive stress environment
EJ Sellers, SJ Coetzer & R Kamstra (CSIR)
(Extension of GAP 314)
|
10-02
121p.
kR 989
|
G/P
|
Rockbursts
|
|
Tectonics
Rock mechanics
Computational methods
|
Layouts
|
|
Report
Methodology: stress measurement programme
Device: improvement to 3-borehole stress measuring device
|
|
|
Review
U/g tests
|
GAP 708
CD #3
|
The design and development of an effective support system for tabular stopes in gold and platinum mines
Part a: A Daehnke, MKC Roberts, M van Zyl, E Acheampong & G Harper (CSIR), R Otterman, D Burger & A von Wielligh (Pretoria U)
Part b: D Spencer (Turgis)
|
10-00
27p.
a. kR 700
b. kR 100
|
G/P
|
Rockfalls
Rockbursts
|
X
|
|
Support systems (stopes)
|
|
Report
Device: conceptual design of face area support systems
|
|
|
Review
Functional analysis
Specification
Conceptual designs
|
GAP 709a
CD #4
|
The meaningful use of peak particle velocity at excavation surface for the optimisation of the rockburst support criteria for tunnels and stopes
AM Milev, SM Spottiswoode, BR Noble, LM Linzer, M van Zyl, A Daehnke & E Acheampong (CSIR)
|
03-02
139p.
kR 3000
|
G/P
|
Rockfalls
Rockbursts
|
|
Seismology
|
Support systems (tunnels and stopes)
|
|
Report
Methodology: improved stope support design
|
|
|
Review
Theoretical analysis
U/g observations
Data analysis
Back analysis
|
GAP 709b
CD #4
|
The meaningful use of peak particle velocity at excavation surface for the optimisation of the rockburst support criteria for tunnels and stopes
A Cichowicz (ISSI)
|
03-01
49p.
kR 700
|
G/P
|
Rockfalls
Rockbursts
|
|
Seismology
|
Support systems (tunnels and stopes)
|
|
Report
|
|
|
Review
Theoretical analysis
U/g observations
Data analysis
Back analysis
|
GAP 710
CD #4&5
|
Underground verification of the large deflection performance of fibre reinforced shotcrete subjected to high stresses and convergence and to dynamic loading.
WC Joughin, JL Human and PJ Terbrugge (SRK)
|
10-02
185p.
kR 862
|
G/P
|
Rockfalls
Rockbursts
|
|
|
Support
(tunnels, shotcrete)
|
|
Report
|
|
|
Review
U/g observations
Lab tests
Numerical modelling
|
GAP 711
CD #3
|
Assessment of seismic risk in the Bushveld complex platinum mines
A vZ Brink, TO Hagan, MKC Roberts & AM Milev (CSIR)
|
03-01
52p.
kR 401
|
P
|
Rockbursts
|
|
Seismology
|
Layouts
Support (regional/local)
Hazard identification
|
Risk assessment
|
Report
Design chart: energy capacity - deformation
Technique: seismic risk assessment
|
|
|
Data analysis
|
GAP 712
CD #3
|
Implementation of state-of-art mining knowledge and technologies in design and operation of a safe and efficient deep gold mine stope for 21st Century
JN van der Merwe, L Wojno, AZ Toper (CSIR)
|
02-01
65p.
kR 250
|
G/P
|
Rockfalls
Rockbursts
|
|
|
Support (face area)
Barring
Drilling
Cleaning
Ventilation
|
|
Report
Conceptual design: integrated mining system
|
X
|
|
Review
|
GAP 714
CD #4&5
|
Software tool for managing rock related hazards in South African mines
A vZ Brink & TO Hagan (CSIR)
|
03-02
50p.
kR 500
|
G/P
|
Rockbursts
|
|
Seismology
|
Hazard identification
|
Risk assessment
|
Report
Software: seismic risk assessment
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Theoretical analysis
Software devlpmnt
Data analysis
Back analysis
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GAP 722
CD #4&5
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A methodology and computer program for applying improved, inelastic ERR for the design of mine layouts on planar reefs
SM Spottiswoode & AM Milev (CSIR)
(Extension of GAP 612c)
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08-02
86p.
kR 1314
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G/P
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Rockbursts
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Rock mechanics
Seismology
Computational methods
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Layouts
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Report
Methodology: use of inelastic ERR
Software: MINF expanded
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Theoretical analysis
Software devlpmnt
Data analysis
Back analysis
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GAP 723
CD #4
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Enhancements to the Support Design Analysis (SDAII) software
Software available from SIMPROSS
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kR 200
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GAP 727
CD #3
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Updating and maintaining the accident database
EP Jaku, AZ Toper & AJ Jager (CSIR)
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03-01
22p.
kR 30
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G
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Rockfalls
Rockbursts
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Hazard identification
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Cause of accidents
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Report
Database: rock-related accidents
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Review
Data analysis
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GAP 728
CD #3
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Updating of Numerical Modelling Handbook
See GAP415
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kR 30
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GAP 729
CD #4&5
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Support Database Catalogue update
Database available from SIMPROSS
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kR 30
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GAP 730
CD #3
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The effectiveness and profile of the SIMRAC research effort in improving safety in gold and platinum sectors
R Triebel & S van Niekerk (LHA Management Consultants)
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11-01
28p. +
8p. App.
kR 40
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G/P
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Rockfalls
Rockbursts
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Implementation
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Report
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X
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Survey
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GAP 801
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Finalisation of the design, testing and commercialisation of the quiet rock drilling system
RW Otterman & NDL Burger (Pretoria U)
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In progress
kR 1118
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GAP 804
CD #4
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Role of illumination in reducing risk to health and safety in South African gold and platinum mines
AM Rushworth, CF Talbot, RM Lomas FH von Glehn (BBE) RM Franz(CSIR)
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11-01
42p +
152p. Apps.
kR 562
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G/P
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Rockfalls
Slip/trip/fall
Machine collisions
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Illumination
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Report
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Review
U/g observations
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GAP 810
CD #4
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Performance of various types of containment support under quasi-static and dynamic loading conditions
Part 1: JS Kuijpers, AM Milev, AJ Jager & E Acheampong (CSIR)
Part 2: WD Ortlepp & AH Swart (SRK)
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