Search Documents

By C Yeung, G Fitz, R Heater, P D. Katsabanis

Explosives malfunction due to shock waves is a serious concern for successful blasting results. Malfunction can range from sympathetic detonation to desensitization and modification of firing times of conventional pyrotechnic detonators.

Jan 1, 1994

By Edward J. Jr Walter

This paper discusses the use of slant hole drilling and water matting as an effective method of reducing costs in shaft sinking operations through a general review of cost priorities for the contractor.

Jan 1, 1976

By Stanley L. Lippincott

A number of Federal and State agencies require formal training for blasters. Federal agencies often specify the need for initial training involving all job responsibilities as well as periodic refresher training to assure adherence to current operating procedures. failure to provide and document such training can result in substantial penalties.

Jan 1, 1995

By Salah A. Taqieddin

In an open pit, or a quarry blasting operation, a muck pile of broken material of given size and quantities suitable to a load/hauling system is normally created at the foot of a bench. Fragmentation can be used to evaluate the efficiency of that blast configuration.

Jan 1, 1987

Vibration resulting from blasting has been a source of concern from the inception of the use of explosives. As a result many investigations have been made concerning the seismic effects of blasting and at present there is available an adequate set of standards with which to judge seismically the damage capability of a blasting operation.

Jan 1, 1976

By Thomas L. Barkley, Steve Salli

In the past, blasters have attempted to evaluate the results of their blast designs and make corrective adjustments to improve the blasts' productivity and value to the mining operation. The methods employed have nearly always been "eyeball" evaluations and "trial and error" corrections.

Jan 1, 1997

By Rowland Jones

This type of quarrying is very much different from that of established quarries in developed countries, demanding somewhat unorthodox techniques to produce the variety of materials required. The demands on the resourcefulness of-the quarrymaster can be very testing, and produces quite a different breed of individual than what is normally met in managerial status in quarries of developed nations.

Jan 1, 1977

By Steve Dillingham

In recent years, there has been a trend toward increasingly demanding blasting standards being enacted by local and regional regulatory authorities. The objective of this paper is to alert blasters of the difficulties that are created for blasting projects as a result of these restrictions, as well as the steps that can be taken to minimize future conflicts.

Jan 1, 1995

By Charles D. Sutton

Safety is an important part of the everyday activity for the explosives industry. The overall accident experience has not been adverse, however, many insurance companies have eliminated coverage for explosive related activities. The Nobel Insurance Group has responded to this insurance problem for our explosives customers. It is vital that safety efforts continue for all aspects of the business. The continuation of insurance policies for explosives, clearly depends on safety.

Jan 1, 1987

By Gerard O'Brien, Douglas Comstock

"The construction of the Third Harbor Tunnel is the first major portion of the Central ArteryProject. The tunnel is designed to connect South Boston to East Boston to alleviateautomobile congestion through the downtown area. The 4000' long tunnel traversesBoston harbor as a cut and cover tunnel as opposed to a bored tunnel."

Jan 1, 1993

By R D. Skaggs

A good blast is dependent on a well engineered design. However, a good design's performance depends on the control of the drilling and loading of the blast holes. The key stone to good blasting is the drilling of straight holes of the correct orientation in the required positions.

Jan 1, 1991

By Robert Hopler

In part four, the instrumentation used to detect the vibrations from the 1876 Hell Gate (East River, New York) reef-clearing blast was discussed. The apparatus consisted of cups of mercury and microscopes or other magnifying instruments to detect ripples or waves on the surface of the liquid metal.

Jan 1, 2007

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 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 N K. Jain

"The idea of writing this article is to give correct picture about the technique in blastingindustries based on the safety aspect, basically without effecting the results thereof.Like many other sciences, blasting is rapidly advancing and research scientists are dailycreating new devices which are very reliable and efficient.The theory of explosion and all the respective changes caused by the explosives takingplace during the detonation has been brought up to the level enabling a mathematicalexpression of detonation characteristics even in comparative complex cases."

Jan 1, 1993

By T. N. Singh, Vasudev Singh

Most of the surface mines in India have drilling and blasting practice as excavation method. All the mines have to keep the blast vibration level below a certain limit. But when mining operation is near some important civil structure, prediction and control of ground vibration becomes critical. Prediction of safe charge and finding the appropriate methodology is important for blasting near important civil structures.

Jan 1, 2006

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 C Deacon, M Jones, P Duniam

Electronic blast timing has been in use around the world since the mid-eighties, and, whilst it has yet to be used commercially by large operations on an ongoing basis, significant inroads have been made in niche areas where tighter control of blasting is required.

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 Dale Nies, David P. Childs

The open pit gold and silver mining operations in the State of Nevada have historically used simple row by row, echelon, or chevron delay patterns. Common practice has been to use detonating cord trunklines and either detonating cord downlines or nonelectric common in-hole delays in conjunction with surface delays. Several operations use a series of downhole nonelectric delays with an entire row loaded with the same delay to develop similar patterns.

Jan 1, 1991