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Blasting is an important part of most mining operations. Between 1978 and 2000, 106 miners were killed and 1,050 were injured by explosives and breaking agents. Through the efforts of government, mine operators, labor, and academia, these numbers have been significantly reduced. In 2001, there were 7 blasting-related injuries and fatalities in the mining industry, compared to 140 in 1978. While blasting has become safer, accidents still occur so continued vigilance is needed. For the past two decades, most explosives-related injuries and fatalities in surface mines occurred when workers were struck by rock, either because they were too close to the blast or rock was thrown much farther than expected. The second leading cause was blasts that shoot prematurely. In underground mines, most explosive-related fatalities were caused by miners being too close to the blast, followed by explosive fumes poisoning, misfires, and premature blasts. Misfires lead to injuries and fatalities as miners try to shoot explosives that failed to detonate in the original blast. Premature blasts occur without warning while blasters are near the explosive-loaded boreholes; the explosive may be initiated by lightning, the impact of explosives being dropped down a dry borehole, or careless handling of the initiating system (blasting caps).|
Explosives Spotlights
A Century of Bureau of Mines/NIOSH Explosives Research (PDF, 177 KB, 2010) Relationship Between Radiated Seismic Energy and Explosive Pressure for Controlled Methane and Coal Dust Explosions in an Underground Mine (PDF, 594 KB, 2012) A Review of Recent Accidents Involving Explosives Transport (PDF, 601 KB, 2009-03) |
Overviews
A Review of Recent Accidents Involving Explosives Transport (PDF, 601 KB, 2009-03)
This article is a review of recent accidents involving explosives transport both in the United States and outside of the United States.
Data & statistics
Fatal Accidents Due to Flyrock and Lack of Blast Area Security and Working Practices in Mining (PDF, 173 KB, 2003)
This paper briefly describes six representative fatalities due to flyrock and lack of blast area security in coal and nonmetal mines. Several mines were visited to collect information relative to working practices aimed at mitigating blasting hazards. Salient information obtained through these visits is presented
Flyrock Issues in Blasting (PDF, 61 KB, 2001)
A compilation of the primary causes of flyrock in surface mining blasting operations and reasons a safe blast area was not secured.
A Summary of Fatal Accidents Due to Flyrock and Lack of Blast Area Security in Surface Mining, 1989 to 1999 (PDF, 264 KB, 2002)
This paper summarizes flyrock and blast area security fatalities from 1989 to 1999 and examines the causative factors. Accident data indicates that flyrock and lack of blast area security were the primary causes of blasting related injuries in surface mining. Fatal injuries due to lack of blast area security were attributed to: failure to clear blast area; failure to follow instructions; inadequate guarding; inadequate blasting shelter; and unsafe location.
History
A Century of Bureau of Mines/NIOSH Explosives Research (PDF, 177 KB, 2010)
The authors' goal is to summarize the totality of the USBM's explosives and blasting research.
A Primer on Explosives for Coal Miners (PDF, 1953 KB, 1911-01)
This little book on explosives is published in the hope that it may aid in preventing accidents resulting from the improper use of explosives in mining.
Models
Work Principle for Predicting Explosive Toxic Fumes (PDF, 1167 KB, 1998)
Research on applying the work principle to the non-ideal conditions of mining explosives to determine toxic fume production.
Work-Principle Model for Predicting Toxic Fumes of Nonideal Explosives (PDF, 919 KB, 2004-08-01)
The work-principle from thermodynamics was used to formulate a model for predicting toxic fumes from mining explosives in underground chamber tests, where rapid turbulent combustion within the surrounding air noticeably changes the resulting concentrations. Two model constants were required to help characterize the reaction zone undergoing rapid chemical transformations in conjunction with heat transfer and work output: a stoichiometry mixing fraction and a reaction-quenching temperature. The work-principle model yields toxic concentrations for a range of charge formulations, making it a useful tool for investigating the potential hazard of released fumes and reducing the risk of unwanted incidents.
Hazards
Dangers of Toxic Fumes from Blasting (PDF, 63 KB, 2007)
This paper reviews the potential hazards posed by the toxic fumes produced by detonating explosives in surface mining and construction operations. Techniques to protect workers and the public from the potential hazards of explosive-related toxic fumes are discussed.
Gas and Fume Generation at the Blast Site (PDF, 4116 KB, 2011)
Gases and fumes are generated as a result of explosives detonation at a blast site. This chapter discusses only those gases produced by the detonation of commercial explosives.
Measurement & analysis
Behavior of Nitrogen Oxides in the Product Gases from Explosive Detonations (PDF, 117 KB, 2006)
In this study, 10-lb charges of blasting agent confined in either thin-wall 4-in-diam galvanized pipe or 4-in schedule 80 stainless steel pipe were detonated in a closed chamber. detonation gases were analyzed for nitrogen dioxide, nitric oxide (NO), ammonia, hydrogen, carbon monoxide, carbon dioxide, nitrogen, oxygen, and methane. Data were evaluated to determine the kinetics of the oxidation of NO to nitrogen dioxide. The information on NO oxidation kinetics provided will prove useful in efforts to model the behavior of NO and nitrogen dioxide in clouds of detonation products near blasting operations.
Blasting-Related Carbon Monoxide Incident in Bristow, Virginia (PDF, 581 KB, 2004)
A detailed description of blasting-related carbon monoxide migration from a construction site into nearby residential homes.
Chemical and Physical Factors that Influence N0x Production During Blasting: Exploratory Study (PDF, 1147 KB, 2002-02)
Report on a NIOSH study to identify factors that may contribute to nitrogen oxides (NOx) production associated with non-ideal detonation of blasting agents.
CO Migration from Trench Blasting in Amherst, New York (PDF, 1480 KB, 2004)
A general overview of the blasting and CO monitoring of a highway construction project is presented and discussed. The use and effectiveness of residential type CO monitors and multi-gas monitors are discussed.
Factors Affecting ANFO Fumes Production (PDF, 307 KB, 2000-02)
Study of toxic fumes produced by the detonation of various ammonium nitrate/fuel oil (ANFO) mixtures and several cap-sensitive explosives.
Factors Affecting Fumes Production of an Emulsion and ANFO/Emulsion Blends (PDF, 2452 KB, 2001-01)
Study of toxic fumes produced by the detonation of ANFO/emulsion blends. An extension of previous ANFO fumes production research that includes an emulsion blasting agent.
Field Studies of CO Migration from Blasting (PDF, 659 KB, 2005)
Describes a small-scale field study to identify key factors that may contribute to the migration of CO through the ground.
Fugitive Carbon-Based Gases: Blasting Related or Not (PDF, 212 KB, 2004)
This paper discusses elements of a stray gas investigation and the analyses necessary to identify the source of a stray gas.
A Gas Pressure-Based Drift Round Blast Design Methodology (PDF, 158 KB, 2008)
The paper begins with a description of the gas pressure-based design approach to blasting and then provides a simple technique for estimating the damage radius associated with the buffer row of holes. It concludes with a discussion of smoothwall design for the contour row of holes.
Impact, Thermal, and Shock Sensitivity of Molten TNT and of Asphalt-Contaminated Molten TNT (PDF, 236 KB, 1996)
Research evaluating the autoclave meltout process to recover TNT from MK-9 depth bombs.
Overlap Probability for Short-Period-Delay Detonators Used in Underground Coal Mining (PDF, 2594 KB, 1985)
Investigation of coal-mine-type short-delay electric detonators to determine the delay accuracy and the probability of overlap between adjacent delay periods.
Relationship Between Radiated Seismic Energy and Explosive Pressure for Controlled Methane and Coal Dust Explosions in an Underground Mine (PDF, 594 KB, 2012)
This paper describes the research conducted to quantify a relationship between measured values of radiated seismic energy and peak explosive pressure generated.
A Technique for Measuring Toxic Gases Produced by Blasting Agents (PDF, 226 KB, 1997-01)
Traditional techniques for the experimental determination of toxic fumes produced by the detonation of high explosives are not applicable to blasting agents. A facility for detonating large, confined charges in a controlled volume has been constructed at the Pittsburgh
Research Center's Experimental Mine.
Technology News 488 - Migration of Blasting Fumes into a Western Pennsylvania Home (PDF, 539 KB, 2001-05)
NIOSH tech news report on an incident where CO generated from blasting at a strip mine migrated through the ground into a nearby home, poisoning the occupants.
Toxic Fume Comparison of a Few Explosives Used in Trench Blasting (PDF, 532 KB, 2003)
Report on NIOSH studies using a 12-foot diameter sphere to identify key factors that may enhance the levels of CO associated with the detonation of several commercial trenching explosives.
Case studies
Application of the NIOSH-Modified Holmberg-Persson Approach to Perimeter Blast Design (PDF, 1722 KB, 2008)
This paper presents a modification which corrects the mathematical error in the Holmberg-Persson approach to perimeter blast design.
A Case Study Examination of Two Blast Rounds at a Nevada Gold Mine (PDF, 900 KB, 2008)
NIOSH researchers collected basic data from two blast rounds at the SSX-Steer Mine as a component of a larger study on controlled blasting, the goal of which is to reduce injuries from falling rocks in underground mines.
Engineering controls
An Analysis and Prevention of Flyrock Accidents in Surface Blasting Operations (PDF, 133 KB, 2004)
Discusses several flyrock injury incidents at surface mines and construction sites and describes some injury mitigation techniques.
Blasting Safety - Revisiting Site Security (PDF, 99 KB, 2005)
This paper examines the factors related to injuries due to inadequate blasting shelters and blast area security, and identifies mitigation techniques.
Evaluation of a Sheathed Permissible Explosive Charge for Open Shooting in Flammable Atmospheres (PDF, 1087 KB, 1982-04)
The Bureau of Mines has developed a prototype nonincendive explosive rock-breaker charge that can be fired unconfined in underground bituminous coal mines without the danger of igniting a flammable atmosphere that might be present.
Monitoring and Removal of CO in Blasting Operations (PDF, 396 KB, 2008-12)
This paper discusses the most feasible means of preventing CO migration, mitigating CO that has migrated, and detecting CO in an underground enclosed space and may help reduce the exposure of unsuspecting area residents to carbon monoxide and help prevent the implementation of unnecessary regulations and limitations on blasting.
Protecting Workers From Toxic Fumes Generated by Explosives (PDF, 110 KB, 1999-12)
An article outlining the hazards of carbon monoxide (CO) generated from blasting operations.
Securing the Blast Site to Prevent Blasting Related Injuries: Blasting Safety - Revisiting Site Security (PDF, 129 KB, 2005)
This article examines the factors related to injuries due to inadequate blasting shelters and blast area security, and identifies mitigation techniques.
Short-Delay Blasting in Underground Coal Mines (PDF, 2091 KB, 1986)
Research to determine whether the total elapsed delay time for blasting bituminous coal in underground coal mines could be safely expanded beyond the 500-ms limitation without igniting a methane or methane-coal dust atmosphere. Also reports on safety evaluation of 18" hole spacing for delay blasting in coal relative to misfires.
Training packages
Toolbox Training on Flyrock Awareness
The objective of this toolbox training on Flyrock Awareness is to improve blast safety by providing information about blasting to those who work around blast sites.
Training
Technology News 522 - Blast Area Security: Flyrock Safety (PDF, 101 KB, 2006-12)
NIOSH has released communication products about flyrock safety in the form of informational brochures, flashcards, and toolbox talk materials. These communication tools target the mining and construction industries, and can be used as refresher training for employees and as introductory safety materials for onsite visitors.
Videos
Blast Area Security
This video provides information about blast area security to those working around blast sites.
Facilities
Bombproof 142
Assessing the quality and performance characteristics of explosive materials.
Explosives Testing Pond
Underwater testing of explosives.
Explosives Testing Site (Plateau)
Explosives testing.
Lake Lynn Experimental Mine
Large-scale explosion trials and mine fire research.
Information gateways
Alcohol, Tobacco, and Firearms (http://www.atf.gov/)
Institute of Makers of Explosives (IME) (http://www.ime.org)
International Society of Explosive Engineers (ISEE) (http://www.isee.org)
Mine Safety and Health Administration (http://www.msha.gov)
Occupational Safety and Health (OSHA) (http://www.osha.gov/)
Office of Surface Mining Reclamation and Enforcement (OSMRE) (http://www.osmre.gov/)