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Jan 1, 2002

By Liu Hui Yang Nianhua Feng Shuyu

The paper analyzed the dynamic stress in the rock around the tunnel and the effect on the stress variation for the different blasting parameters. Also, the paper verified the theoretical results by dynamic photoelastical tests and provided helpful reference for the design of blasting near a tunnel.

Jan 1, 1998

By D K. Joyce

Large diameter boreholes have become increasingly popular in underground mining. Drilling equipment can drill full rings, including vertical upholes. Special techniques are required to load upholes of three inch to eight inch diameter. The current methods for loading AN/FO and bulk or packaged emulsions are described.

Jan 1, 1988

By Jim Daley

This case history discusses a pre-split test conducted at BHP Mineralss Navajo Mine in Fruitland, New Mexico. The test was an extension of earlier pre-split testing conducted by Virgil Stachura of the U.S. Bureau of Mines in conjunction with Navajo Mine and WESCO Inc. which tested low-density product in 10.625 diameter holes.

Jan 1, 1996

By Robert A. Farnfield

This paper outlines the theory behind transfer functions and illustrates their application in the prediction of structural response to blast induced ground vibration. The ability to predict the response of a structure to a recorded ground vibration is desirable for a number of reasons.

Jan 1, 1994

By John R. Jr Tripi, Paul N. Worsey

Split round blasting is commonly practiced in underground uranium mining in the Big Indian ore belt located in Southeast Utah. The technique is used to prevent ore dilution by separately blasting the ore from the face.

Jan 1, 1985

By David F. Street

In order to achieve an efficient operation in an open pit mine it is very important to develop and maintain good coordination and communication between various departments within the operation. This paper will address this subject using methods and procedures developed at an open pit gold mine in northern Nevada.

Jan 1, 1994

By Eric R. Achelpohl

The paper follows the introduction of a college student into the explosives industry. The opportunity of experiences from classes and work at the University of Missouri-Rolla, along with summer internship experiences are highlighted.

Jan 1, 1998

By David Harrison, Edward J. Walter, Meitra Ferek

A pre-blast survey can be a great tool in the prevention of blasting complaints and subsequent damage claims. In today's highly competitive industry, we are always looking for ways to become more cost effective. This paper investigates the importance of pre-blast surveys not just for regulatory compliance, but as an overall long term cost cutting and public relations tool.

Jan 1, 1995

By D Reid Watson

A unique blend of theory and hands-on teaching of blast hole drilling and explosives technology is being provided at a Canadian Community College. Students graduate at an apprentice level quite capable of operating and maintaining blast hole drills and designing and executing surface blasts.

Jan 1, 1987

By Donelson A. Robertson

Proper coupling between the seismograph transducer and the surface is the most important aspect of seismograph monitoring but probably receives the least attention in many blasting situations. Without good coupling, particle velocity measurements may be higher than actual and frequencies may be lower. If the field data are inaccurate, sophisticated instrumentation and computer programs cannot correct the readings.

Jan 1, 1993

By Jim Simpson, John Waller, Scott Stewart

The authors review the evolution of drilling and blasting procedures at this West Virginia surface coal mine where management seeks continually to improve and update the drilling and blasting programs. Today's operations require efficient programs which include quality control to maximize production and minimize the public's sensitivity to the blasting events.

Jan 1, 1992

By Bharat B. Dhar, M D. Nabinllah, A J. Prakash

The study is an approach made in simulating air overpressures induced by surface blasting from those produced during gallery blasting in the laboratory, and experiments conducted on a portable window with a view to establish the sound pressure Level (SPL) for cracking of window glasspanes.

Jan 1, 1994

By Paul Miller, Rene Laprade

Does a 76 mm Ø hole drilled over 45 m deep remain straight? This is the question asked by the Engineering department at Placer Dome's Dome Mine in Timmins, Ontario before they could lay out the initiation sequence in a long-hole production stope. Everyone realized that the holes would wander over such great depths, but it was important to know where they went.

Jan 1, 1998

By H J. MacDonald

An Exploding Bridgewire Detonator (EBW) is an explosive initiator which contains only secondary explosives such as PETN and RDX. It is safer than the normal blasting cap because it requires both high electrical energy and a very fast application of that energy to function

Jan 1, 1981

By P D. Katsabanis

Explosives malfunction due to shock waves is a serious concern for successful blasting results. Malfunction includes sympathetic detonation and desensitization of explosive charges as well as the modification of firing times of conventional pyrotechnic detonators.

Jan 1, 1995

By Jack Eloranta

This paper compares energy requirements for blasting, crushing and grinding. By tracking electrical consumption for various powder factors, a general trend has appeared. This study involves over 100 million tons of ore and powder factors ranging from .5 lbs/LT to .8 lbs/LT. Actual energy usage is compared to predicted energy based on the Bond equation.

Jan 1, 1997

By J Lyall Workman, Peter N. Calder

Flyrock can be a serious hazard associated with blasting. Many surface blasting accidents involving injury result from excessive flyrock beyond the protected blast zone. Numerous cases of equipment damage at the mine, quarry or construction site have resulted from flyrock. Fragments propelled beyond the property limits of the operation have also caused injury and damage.

Jan 1, 1994

By Richard N. Snyder

In this system for connecting blasting caps to the initiation source, the need for a redundant design structure provides more reliable method of explosive initiation. This is accomplished by using a complete system starting at the blasting control, through the initiation line structure through the initiation line and connecting blocks to the blasting cap. The connecting structure between the initiation device and the blasting caps may be connecting blocks or other means.

Jan 1, 1995

By C. B. Navalkar

The optimization of blast design under consideration is for the conventional driveways in under ground coal mines with respect to board & pillar workings in India. Basically The Blast Design includes following parameters: AA> Drilling Pattern. BB> Charging Pattern. CC> Material & Method Of Stemming. DD> Selection of type & quantity of explosives. EE> Initiation system & Blasting Sequence.

Jan 1, 2002