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Wall control blasting at Donkerpoort
29A 891230 Extraction of narrow-seamed limestone deposits. Experience of qnarrying in New Zealand's Poverty Bay area Pulman, S
891234 Current drilling and blasting practice at Mount Tom Price Mine, Western Australia Hancock, A W J; Lilly, P A
Quarry Manage July 1988, P19-22
Proc lnterMtioaal Conference of the Soatk African Institute of M i ~ and Metallurgy: Planning and Operation of Openpit and Strip Mines, Pretoria, 9-13 April 1984 P213-223. Pubi Johannesburg: South African Institute of Mining and Metallurgy, 1986
Limestone suitable for road wearing surfaces is present in this area only in distorted, folded, steep seams of narrow width. To ensure commercial viability, extensive investigation to gauge the seam, and planning of overburden stripping and disposal are necessary. As small areas and narrow benches only can be worked, carefully controlled blasting is required, and the blast pattern is fine tuned to optimise extraction of each seam. 891231 Review of blast design consideration in quarrying and opencast mining. Part 2. Initiation and computerised design Ball, M
Quarry Manage July 1988, P23-27 Specific attributes of available explosives are first considered. Initiation and detonation to achieve maximum efficiency of blast and required rock pile shape for different rock types are discussed. Computer aided design, in particular the SABREX model, is discussed and the required input parameters on blast geometry, explosives, and rock properties listed. It is demonstrated that it is still possible, however, to achieve safe and economic blasting on the basis of sound experience and accurate survey information. 891232 Finite element analysis of vibrations induced by propagating waves generated by tunnel blasting Valliappan, S; Ang, K K
Rock Mech Rock Engng V21, NI, Jan-March 1988, P53-78 Blast vibrations, caused by detonation of explosives in drilIholes, may induce permanent damage, so amplitudes of the propagating waves should be kept to a safe level. A 2D dynamic finite element analysis to predict the peak particle velocity and stress response due to tunnel blasting has been developed. A pseudo plane strain concept was adopted since it modelled attenuation of propagating waves more accurately than normal plane strain. The method is illustrated for the case of a new tunnel excavated close to an existing tunnel, aiming to predict the level of blast vibrations generated at the existing tunnel and the ground surface. This indicates that results from numerical analyses may complement field investigations to produce guidelines for safe and controlled blasting. 891233 Development and operation of Palabora's dense blasting agent system Fauquier, G P
Proc International Conference of the South African Institute of Mining and Metallurgy: Planning and Operation of Openpit and Strip Mines, Pretoria, 9-13 April 1984 P193-204. Publ Johannesburg: South African Institute of Mining and Metallurgy, 1986 At this very large open pit copper mine, large diameter biastholes and slurry explosives are used, with self operation of all aspects of explosives. An overview of drilling and blasting is presented, and some factors controlling fragmentation introduced. The complete slurry production, transportation, and injection cycle is described and the advantages of having total control over on-site quality of slurry against an outside downthe-hole loading service discussed.
The orebody is intercalated high grade haematite and shale bands, with 10-30m of gocthite overburden. The haematite is divided into three classes according to hardness. Information for blast engineers is gained from the nature of drill chippings and gamma logging. Blast design, charging and blasting procedures, blasting at final pit limits, economics,research, and modelling of blasts are described. 891235 Wall control blasting at Donkerpoort Jordaan, A J; Graham, H L
Proc International Conference of the South Aj~ican Institute of Mining and Metallurgy: Planning and Operation of Openpit and Strip Mines, Pretoria, 9-13 April 1984 P235-244. Publ Johannesburg: South African Institute of Mining and Metallurgy, 1986 Walls at the Donkerpoort mine are of grey dolomite and banded ironstone. Blasting involved presplitting, buffer blasting, and staggered-hole-depth blasting in the ironstone, weathered material, and dolomite respectively. A successful blasting strategy, utilizing the different rock properties, was developed after extensive theoretical work and field trials. Blast design and charging features are illustrated. The steeper walls produce increased efficiency and reduce the stripping ratio. 891236 Comparative study of fragmentation and ground vibration from collar and bottom primed bench blasts Brinkmann, J R
Proc International Conference of the South African Institute of Mining and Metallurgy: Planning and Operation~of Openpit and Strip Mines, Pretoria, 9-13 April 1984 P253-262. Publ Johannesburg: South African Institute of Mining and Metallurgy, 1986 Primer location has a direct effect on magnitude and shape of the stress wave from a blast. Multiple hole small scale bench blasts in dolomitic rock were undertaken to investigate differences in degree of fragmentation and ground vibration magnitudes resulting from top and bottom priming. Complete screen analyses of rock fragments and particle velocity records were recorded for each blast. Bottom priming offers superior results in both respects. 891237 Drilling and blasting practices at Sishen iron ore mine Schoeman, J L
Proc International Conference of the Soatk African Institute of Mining and Metallurgy: Plunalag mad Operation of Openpit and Strip Mines, Pretoria, 9-13 April 1984 P299-309. Pub/ Johannesburg: South African Institute of Mining and Metallurgy, 1986 The geology of the open pit mine is described. Bench heights of 12.5m are used as this conforms well with the stratification of the ore. 4 types of drill bit are used according to formation hardness. Drill hole depth and cost are closely controlled. Blasting is with ANFO or AI/ANFO explosives. Selection of explosive, planning, drilling patterns and blast design are discussed.
© 1989 Pergamon Press pie. Reproduction not permitted
891234 Current drilling and blasting practice at Mount Tom Price Mine, Western Australia Hancock, A W J; Lilly, P A
Quarry Manage July 1988, P19-22
Proc lnterMtioaal Conference of the Soatk African Institute of M i ~ and Metallurgy: Planning and Operation of Openpit and Strip Mines, Pretoria, 9-13 April 1984 P213-223. Pubi Johannesburg: South African Institute of Mining and Metallurgy, 1986
Limestone suitable for road wearing surfaces is present in this area only in distorted, folded, steep seams of narrow width. To ensure commercial viability, extensive investigation to gauge the seam, and planning of overburden stripping and disposal are necessary. As small areas and narrow benches only can be worked, carefully controlled blasting is required, and the blast pattern is fine tuned to optimise extraction of each seam. 891231 Review of blast design consideration in quarrying and opencast mining. Part 2. Initiation and computerised design Ball, M
Quarry Manage July 1988, P23-27 Specific attributes of available explosives are first considered. Initiation and detonation to achieve maximum efficiency of blast and required rock pile shape for different rock types are discussed. Computer aided design, in particular the SABREX model, is discussed and the required input parameters on blast geometry, explosives, and rock properties listed. It is demonstrated that it is still possible, however, to achieve safe and economic blasting on the basis of sound experience and accurate survey information. 891232 Finite element analysis of vibrations induced by propagating waves generated by tunnel blasting Valliappan, S; Ang, K K
Rock Mech Rock Engng V21, NI, Jan-March 1988, P53-78 Blast vibrations, caused by detonation of explosives in drilIholes, may induce permanent damage, so amplitudes of the propagating waves should be kept to a safe level. A 2D dynamic finite element analysis to predict the peak particle velocity and stress response due to tunnel blasting has been developed. A pseudo plane strain concept was adopted since it modelled attenuation of propagating waves more accurately than normal plane strain. The method is illustrated for the case of a new tunnel excavated close to an existing tunnel, aiming to predict the level of blast vibrations generated at the existing tunnel and the ground surface. This indicates that results from numerical analyses may complement field investigations to produce guidelines for safe and controlled blasting. 891233 Development and operation of Palabora's dense blasting agent system Fauquier, G P
Proc International Conference of the South African Institute of Mining and Metallurgy: Planning and Operation of Openpit and Strip Mines, Pretoria, 9-13 April 1984 P193-204. Publ Johannesburg: South African Institute of Mining and Metallurgy, 1986 At this very large open pit copper mine, large diameter biastholes and slurry explosives are used, with self operation of all aspects of explosives. An overview of drilling and blasting is presented, and some factors controlling fragmentation introduced. The complete slurry production, transportation, and injection cycle is described and the advantages of having total control over on-site quality of slurry against an outside downthe-hole loading service discussed.
The orebody is intercalated high grade haematite and shale bands, with 10-30m of gocthite overburden. The haematite is divided into three classes according to hardness. Information for blast engineers is gained from the nature of drill chippings and gamma logging. Blast design, charging and blasting procedures, blasting at final pit limits, economics,research, and modelling of blasts are described. 891235 Wall control blasting at Donkerpoort Jordaan, A J; Graham, H L
Proc International Conference of the South Aj~ican Institute of Mining and Metallurgy: Planning and Operation of Openpit and Strip Mines, Pretoria, 9-13 April 1984 P235-244. Publ Johannesburg: South African Institute of Mining and Metallurgy, 1986 Walls at the Donkerpoort mine are of grey dolomite and banded ironstone. Blasting involved presplitting, buffer blasting, and staggered-hole-depth blasting in the ironstone, weathered material, and dolomite respectively. A successful blasting strategy, utilizing the different rock properties, was developed after extensive theoretical work and field trials. Blast design and charging features are illustrated. The steeper walls produce increased efficiency and reduce the stripping ratio. 891236 Comparative study of fragmentation and ground vibration from collar and bottom primed bench blasts Brinkmann, J R
Proc International Conference of the South African Institute of Mining and Metallurgy: Planning and Operation~of Openpit and Strip Mines, Pretoria, 9-13 April 1984 P253-262. Publ Johannesburg: South African Institute of Mining and Metallurgy, 1986 Primer location has a direct effect on magnitude and shape of the stress wave from a blast. Multiple hole small scale bench blasts in dolomitic rock were undertaken to investigate differences in degree of fragmentation and ground vibration magnitudes resulting from top and bottom priming. Complete screen analyses of rock fragments and particle velocity records were recorded for each blast. Bottom priming offers superior results in both respects. 891237 Drilling and blasting practices at Sishen iron ore mine Schoeman, J L
Proc International Conference of the Soatk African Institute of Mining and Metallurgy: Plunalag mad Operation of Openpit and Strip Mines, Pretoria, 9-13 April 1984 P299-309. Pub/ Johannesburg: South African Institute of Mining and Metallurgy, 1986 The geology of the open pit mine is described. Bench heights of 12.5m are used as this conforms well with the stratification of the ore. 4 types of drill bit are used according to formation hardness. Drill hole depth and cost are closely controlled. Blasting is with ANFO or AI/ANFO explosives. Selection of explosive, planning, drilling patterns and blast design are discussed.
© 1989 Pergamon Press pie. Reproduction not permitted