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Fragmentation of Sandstones and Quartzites
By Lewis L. Oriard
Some two million cubic yards of sandstone and orthoquartzite were blasted and excavated at Upper Stillwater Dam, located high in the Uinta Mountains in northern Utah. The material was processed to pro
Jan 1, 1993
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Gulf Slurry Products and Their Uses
By Charles B. Ingram, Neil E. Gehrig
The development of water gel explosive products has been the single most important development in explosive research and development since the invention of nitroglycerine and dyne-mite many years ago.
Jan 1, 1977
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Flyrock Revisited: An Ever-present Danger in Mine Blasting
By Harry Verakis, Thomas Lobb
A great deal of information has been presented and published on the danger from flyrock created from blasting operations. The creation of flyrock is not specific to any one blasting operation. Flyrock
Jan 1, 2007
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Angle Drilling and Blasting Procedures Martin Marietta Aggregates
By Michael E. Kovach
This discussion is an overview of an approach to drilling and blasting angle holes at Martin Marietta Aggregates. Method of determining burdens, hole depths, angle settings and explosive selection wil
Jan 1, 1992
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Test and Study on Hard Rock Blasting in Drift-Pilot of Qinling Tunnel
By Qi Jingyue, Wang Zhongquian, Yang Nianhua
Qinling Tunnel is the longest tunnel in China. The rock stratum is very hard rock - intact mixed gneiss. At the beginning of the construction, drift-pilot excavation is very costly due to the use of r
Jan 1, 1998
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Cast Blasting Around Town
By Jeff Wachendorf
As the title "Cast Blasting Around Town" implies, this paper details the starting of a cast blasting program in and around the town of Colstrip, Montana. As strip ratios have increased, the need to ad
Jan 1, 2009
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Blind Hole Raise Blasting at the Homestake Mine
By Justus Deen, Paul V. Sterk
Through the 119 year history of the Homestake Mine various methods of raise mining have been used, these include conventional, bored, and drop raises. These raises provide passage for men and supplies
Jan 1, 1996
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Amplitude and Frequency Variation of Vibration Wavelets Associated with Overlapping Wave Trains
By Edward J. Walter
A vibration record is a complex of motions resulting from a combination of direct, reflected and refracted seismic energy that originated at a blast source. Multiple hole blasting using delays further
Jan 1, 1989
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Small Scale In-Rock Precompression Testing: Effects of Delay Timing
By J J. Mullay, G W. Anderson, C J. McFinley, J F. VanNorman, C J. Kefer
Previous work has shown that testing of precompression effects conducted on a small scale under simulated field conditions in actual rock provides a reasonable model for the evaluation of explosives a
Jan 1, 1994
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Drilling and Blasting in Thick Seam Coal Mines in the Powder River Basin
By Denard A. II Brandt
Today I would like to share with you some blasting practices used in the thick coal seam mines of Northeastern Wyoming. I will begin by giving you a general overview of a thick seam coal operation at
Jan 1, 1984
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On the Development of Explosion Technology in Seoul Metro-Subway Construction
By Ginn Huh
The blasting work to construct a subway in Seoul, Korea have often caused increased neighbor’s complaints because of ground vibration. In order to prevent the damage to the structure, it was necessary
Jan 1, 2000
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Blast Vibration Wavefront Reinforcement Model
By Adrian J. Moore, Alan B. Richards, Rob Evans
Air and ground vibration from blasting is influenced by the delay pattern that is used. Wavefronts from blastholes fired in a blasting pattern can combine in certain circumstances to give increased bl
Jan 1, 1994
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Numerical Modeling of Oil Shale Fragmentation Experiments
By J S. Kuszmaul
The economic development of modified in situ oil shale retorting will benefit from the ability to design a blasting scheme that creates a rubble bed of uniform permeability. Preparing such a design de
Jan 1, 1985
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The Safe Elimination of Buried Explosives Near Gillette, Wyoming
By William H. Snyer, Victor A. Sterner
A cache of buried explosives was discovered by ICI Explosives, USA Inc. at one of their sites near Gillette, Wyoming. An intensive investigation conducted by ICI management indicated that nitroglyceri
Jan 1, 1997
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Effect of Fragmentation on Loader Efficiency
By David Willock, S. Singh, Michael Glogger
The efficiency of the loading system in a mine depends upon the characteristics of the muck pile, the loading machine specifications and the loading practices. The focus of this paper was to look spec
Jan 1, 2001
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Explosion Bonded Electric Products and Explosion Cutting of Retired Nuclear Installations Pipes
By Hu Wenjun
This paper changes the section of copper of copper to aluminum adapter bar into aluminum plate covered one face or double face with copper coat, and changes the conductor material of knife switch, fus
Jan 1, 2000
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Blast-Induced Rock Fracturing and Minimizing Downstream Comminution Energy Consumption
By Farshad Rashidi Nejad, Ali Asgari, Sanaz Norouzi
Blasting is known as the first step of rock breakage in mines. An indication of the importance of blasting is that more than 1 billion kg (2.2 billion lb) of explosives are used annually in Australia
Jan 1, 2015
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The Effect of Available Energy on Blast Design
By Lyall Workman, P D. Katsabanis
Energy released by the explosive is typically partitioned in brisance, heave and losses. The fact that energy released in the P-V expansion curve below a certain point is lost has resulted in the conc
Jan 1, 1998
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Large Hole Presplitting with Modified Air Gap Blast Designs in Weak Rock
By Larry R. Fletcher, Virgil J. Stachural, Matthew N. Plis
The Bureau of Mines is conducting research on blasting methods that reduce highwall overbreak and the associated rockfall hazards. This paper presents the results of a series of tests to improve presp
Jan 1, 1991
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Explosives Malfunction in Decked Blasts
By Robert Lee, Jay Rodgers, Kirk Whitaker
The time domain during which an explosive detonates and causes rock to fragment and displace is on the order of tens of milliseconds. Because of this, the dynamic processes that occur during this time
Jan 1, 2000