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By He Guangyi

During rock blasting in extending deep cutting from Jiu Li Mountain to Dong Zhuang Village in Jiao Zhi Railway line, we have drilled deep hole with large scale diving drilling machine and successfully carried on controlled blasting. This has provided new experiences for rock blasting in extending existing cutting. The aim of this article is to provide an introduction to bench height, blast holes arrangement, powder charge calculation, and detonating technique during blasting.

Jan 1, 1997

By R J. Roach, D Roy

After months of discussion on ways and means to improve productivity in the shaft sinking process, it was decided to look at those areas where, historically, methods have been stagnant for many years. These categories included drilling, hole diameter, drill patterns, explosive types, explosive loads, initiation techniques, cut design, wall control, fragmentation and heated magazines.

Jan 1, 1997

By Cameron McKenzie, John Heilig, Patrick Andrieux, Andree Drolet

It is widely accepted that both underground and surface blasting operations can de-stabilise excavations to the point where it can threaten the feasibility of mining through personnel safety or OK dilution. Research has been undertaken to outline a practical method in which the impact of blasting will be accounted for during the early excavation design stage by modelling, and during the following production stages by monitoring rock response to blasting operations.

Jan 1, 1994

By Calvin J. Konya

When blasts are designed, we normally assume the best case situation. We assume that all burdens and spacings will be properly drilled, holes will be properly loaded, initiators will fire at the nominal time and the explosives will release their full energy. This type of precision can be obtained at a machine shop where precision equipment is available to do machining, however, in the field, no matter how well a blast is designed on paper, it most likely will not be done in the exact manner in the field.

Jan 1, 1990

By Gerald R. Coonan

I'm really here to talk about my pet subject of government relations. I've been in Peabody's Environmental Quality Department, working on regulations, for over five years, and I have seen a number of individuals in the coal industry who were completely stunned when a new regulation was brought to their attention. Their first reaction was, "where did this come from"?

Jan 1, 1980

By TH Kleine, AR Cameron

Size assessment of fragmentation is all about estimating the population of fragment sizes in the rock pile. A knowledge of the size distribution of particles can be used in applications from evaluating the stability of a waste dump, to optimizing a blast design to achieve a required fragmentation, to on-line control of a crushing and sieving operation.

Jan 1, 1997

By Peter F. Bayer, Fred C. Drury

This paper deals with explosives regulations in the State of Wisconsin. As has been typical elsewhere, there has been considerable pressure to add additional restrictions over blasting in Wisconsin. What we believe to be a novel approach to the problem has been developed and is being implemented. Members of this Society have been instrumental in this approach whereby the emphasis of the regulations is directed at permissible levels of blasting resultants rather than at specific methods of blasting. It is our intent that this paper serve as a guide to others who may become involved in similar regulatory review in other states.

Jan 1, 1984

By R Wing, D Corkery

"Several mines in the region of Sudbury, Ontario, occur in or near populated areas. In anattempt to examine the effects of environmental changes and blast induced vibrations onhomes in the area, a monitoring study was conceived. The study was conducted fromNovember 1990 to May 1991 in homes located near the 880 Stope at INCO Ltd.'s CopperCliff South Mine."

Jan 1, 1993

By Paul Downing

A major component of an effective blasting company safety program is the self-audit. A self-audit can help reveal hazardous conditions that should be corrected and training needs that should be addressed before accidents occur, insurance claims are filed, and/or fines are levied. Such audits, when they lead to appropriate corrective action, can provide significant economic benefits for employers by reducing the costs associated with insurance claims, accidents, and injuries.

Jan 1, 2001

By Francis O. Otuonye

An application of a time series and systems analysis modeling technique to blast vibration data is discussed. The vibration data was taken from a rock support structure and the surrounding rock mass at distances close (less than 15 feet) to a blast. The analysis technique provides quantitative information on the frequencies of ground motion as well as the frequencies and damping ratios of a near-field support structure.

Jan 1, 1994

By A Gene Riggs

The Cerrejon Coal Project in Colombia, South America is one of the largest coal mines in the world. The mine is located in northeastern Colombia on the La Guajira penninsula. The area is in a remote valley 132 miles east of the city of Barranquilla.

Jan 1, 1984

By E Emery Gray, Gary Ard

Each year when hundreds of Engineers and Specialists in the explosives industry meet for the SEE Annual Conference, new ideas are exchanged and new business relationships formed. Harbert Construction Corp. and EGA, Inc., a company specializing in drilling and bIasting, formed such a relationship through mutual interest in such a manner.

Jan 1, 1981

By G Alan Foster

Because of the marked human response to blast effects and inherent defects present in many modern structures the real possibility of being named as a defendant in a law suit faces most blasters. Until recently even frivolous law suits involved a great deal of expense since legal costs were inevitably incurred whilst waiting for your day in court, which typically occurred some 2-4 years after the alleged damage took place.

Jan 1, 1989

By Feng Shuyu Yang Nianhua

According to the results of high speed photography tests, particle velocity measurement tests and the digital calculation with TP2 software, the shape of shock wave, the declined laws of the shock wave propagation speed and the peak particle velocity are described and analyzed in detail. New viewpoints about the theories of blasting fragmentation based on analysis of the progressive pictures of the fracture region are given. The formula for calculating the depth of fracture regions is established on the basis of the new viewpoints.

Jan 1, 1997

By Bengt Niklasson

"A test stope at the Luossavaara Research Mine in Kiruna, Sweden,was divided into four different modules in which various hole patterns and explosives were tested in order to evaluate:1. The optimum combination of explosive and hole pattern2. The resulting fragmentation3. The damage to the surrounding rock4. The application techniques of the VCR mining method"

Jan 1, 1985

By Steven D. Knudsen, Dale S. Preece

The spherical element computer code DMC (Distinct Motion Code) used to model rock motion resulting from blasting has been enhanced to allow routine computer simulations of bench blasting. The enhancements required for bench blast simulation include: 1) modifying the gas flow portion of DMC, 2) adding a new explosive gas equation of state capability, 3) modifying the porosity calculation, and 4) accounting for blastwell spacing parallel to the face.

Jan 1, 1992

By B H. A Brown

The components of passive laser survey systems and their relative functions are presented. A general outline of the capabilities and the information available are followed by two case histories. These involve the use of such systems in quarry blasts where loading adjustments and drilling designs were required. Their application in blast casting operations, stockpile measurement, surface and underground construction, and general surveying areas are briefly covered, with comments on the potential for demonstrating a return on an investment in laser survey equipment.

Jan 1, 1990

By Kfw Eick

The paper describes the use of the Nonel millisecond delay blasting system in narrow, deep, tabular ore bodies and briefly describes the standard stoping method as used on Harmony Gold Mine and compares this with the new Nonel short panel system.

Jan 1, 1990

By R Keller, R Law

In the rush to beat the clock before the handover of Hong Kong back to China in June of 1997, an unprecedented amount of infrastructure work is being undertaken at a breakneck pace. In the middle of this construction explosion, on this island of barren granite , stands some of the most concerning and restrictive slope stability measures. So conservative, these measures impact blasting and vibration control to an extent unmatched anywhere in the world.

Jan 1, 1996

By Karl Ingmarsson

A model for drilling productivity and total drilling cost is presented. It specifically addresses down-thehole drilling, but also covers other drilling methods. The important factors are: 1, productivity in tons drilled; and 2, total cost per drill ton. For non-blasthole applications these factors are measured in drill feet and cost per foot. The model focuses on the entire system and allows the operator to optimize the system based on individual drilling conditions.

Jan 1, 1998