Accidents in the Production, Transport, and Handling of Explosives: TOL Method Hazard Analysis with a Mining Case Study
Abstract
1. Introduction
2. Materials and Methods
2.1. TOL as a Classical Method for Analyzing Accidents and Hazardous Events
- Technical causes—e.g., equipment design flaws, improper maintenance;
- Organizational causes—e.g., lack of supervision, inadequate procedures, poor work planning;
- Human causes—e.g., operator errors, unsafe behaviours, compromised psycho-physical condition.
- Expert validation—analysis results are verified by a panel of independent experts. Such verification increases the objectivity of assessments and reduces the risk of misclassification of causes [35];
- Standardized checklists—the analysis is based on structured auxiliary tools with standardized questions for each cause category, which limits interpretive discretion [36];
- As a primary tool for post-incident investigation committees in Poland;
- In combination with the “5 WHY” technique, as schematically illustrated in Figure 1.
2.2. Sources of Data on Explosives Accidents
2.2.1. SAFEX Accident Reports
2.2.2. Queensland Accident Reports
2.2.3. Selected Accident Reports from the PAR Database
2.2.4. Selected Accident Reports from the eMARS Database
2.2.5. Accident Reports from the State Mining Authority
3. Results
3.1. Major Hazards Associated with the Transport of Explosives
3.2. Major Hazards Associated with the Storage of Blasting Agents
3.3. Major Hazards Associated with Priming and Loading Explosives into Blast Holes and Stemming
- manual loading of bulk explosives (e.g., ANFO);
- manual loading of cartridge explosives;
- mechanical loading of emulsion or granulated explosives.
3.4. Major Hazards Associated with Initiating Explosive Charges
3.5. Major Hazards Associated with Post-Blast Face Inspection
3.6. Major Hazards Related to Mucking Operations
4. Case Study and Discussion
4.1. Description of a Selected Explosives-Related Incident in a Polish Mine
- Unclear risk exposure—The injured worker was not directly involved in blasting operations, highlighting the importance of analyzing indirect risk to employees in such environments;
- Need to reconstruct the event sequence and assess barriers—The TOL method supports a broad evaluation of both actual and potential causes, which is especially valuable in seemingly incidental accidents;
- Preventive significance—Analyzing this event can uncover weaknesses in the technological or organizational framework of the mine;
- Applicability to safety system improvements—The results can support managerial decisions to develop better preventive strategies and training for workers not directly involved in blasting but potentially exposed to its consequences.
4.2. Detailed Analysis Using the TOL Method
4.3. Case Analysis Summary Using the TOL Method
5. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Date | Location/Country | Casualties | Type of Event |
---|---|---|---|
16 April 2021 | – | 1 person slightly injured | Explosion at wastewater treatment plant and nitroglycerin storage tanks. |
14 February 2022 | Krupski Młyn, Poland | 2 fatalities | Explosion during nitroester mixture production. |
4 August 2023 | Lorena, Brazil | 0 | Near-miss event—failure to comply with safety procedures during lead azide production. |
30 August 2024 | Queensland, Australia | 1 person slightly injured, 1 fatality | Road tanker transporting 41.5 tonne of AECI S100 Ammonium Nitrate Emulsion (ANE, AECI Mining Explosives, Bajool, Queensland, Australia) was involved in a collision with a utility vehicle travelling in the opposite direction. The collision started a fire that provided approx. 4 h of uncontrolled heating to the ANE within the road tankers & at approx. 0927 h one of the ANE road tankers exploded. |
25 March 2025 | Lima, Peru | 0 | An explosion occurred at the black powder mill during the discharge process. |
Type of Incident | Date of Incident | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | |
Misfires | 690 | 605 | 438 | 285 | 359 | 213 | 212 | 239 | 256 | 244 | 294 | 367 | 107 |
Vehicle incident | 31 | 44 | 25 | 27 | 15 | 18 | 28 | 21 | 38 | 34 | 53 | 54 | 10 |
Unsecured explosives | 11 | 15 | 11 | 10 | 18 | 8 | 16 | 18 | 26 | 6 | 14 | 3 | |
Explosives discrepancy | 7 | 11 | 10 | 10 | 9 | 12 | 9 | 15 | 17 | 11 | 12 | 18 | 8 |
Fume event | 36 | 23 | 19 | 24 | 21 | 10 | 7 | 8 | 10 | 5 | 13 | 8 | 3 |
Damage to explosives/packaging | 22 | 8 | 20 | 11 | 6 | 6 | 11 | 12 | 12 | 10 | 13 | 13 | 12 |
Explosives found | 14 | 8 | 5 | 3 | 4 | 4 | 5 | 2 | 4 | 2 | 4 | 9 | 1 |
Illegal activity | 4 | 7 | 5 | 5 | 2 | 4 | 6 | 6 | |||||
Breach exclusion zone | 3 | 6 | 9 | 17 | 11 | 7 | 4 | 13 | 9 | 11 | 10 | ||
Inne (other) | 8 | 32 | 23 | 26 | 16 | 7 | 13 | 5 | 4 | 4 | 8 | 4 | 9 |
Unintended initiation | 4 | 12 | 2 | 1 | 6 | 3 | 2 | 2 | 5 | 1 | 1 | ||
Flyrock | 8 | 4 | 4 | 4 | 6 | 5 | 4 | 2 | 2 | 4 | 6 | 1 | |
Theft of Explosives | 3 | 2 | 2 | 1 | 1 | 2 | 1 | 1 | |||||
Unauthorized possession of explosive | 3 | 1 | 1 | 1 | 2 | ||||||||
Pump incident | 8 | 3 | 6 | 2 | 2 | 1 | 1 | 2 | |||||
Ground vibration | 1 | 1 | 1 | 1 | 1 | ||||||||
Storage | 1 | 1 | 6 | 3 | 2 | 4 | 4 | ||||||
Overpressure | 3 | 1 | 1 | 2 | |||||||||
Drill into/near explosives | 3 | 4 | 3 | 1 | 1 | 3 | 3 | 1 | 6 | 1 | |||
Fireworks, blasting complaints | 46 | 11 | 55 | 53 | 87 | 93 | 103 | ||||||
Product failure | 3 | 1 | 3 | 2 | 1 | 2 | |||||||
Unauthorized entry to reserve | 3 | 2 | 1 | ||||||||||
Homemade explosives | 3 | 3 | |||||||||||
Sum of incidents other than misfires) | 199 | 180 | 194 | 186 | 198 | 215 | 215 | 99 | 121 | 136 | 136 | 135 | 61 |
Fatality | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Injury | 2 | 8 | 9 | 0 | 3 | 0 | 2 | 0 | 0 | 2 | 0 | 0 | 0 |
Year | Location/Country | Industry Sector | Casualties | Type of Incident |
---|---|---|---|---|
2005 | Brantham, United Kingdom | Manufacturing | 1 injured | Explosion due to improper handling and use of dried nitrocellulose before mixing |
2006 | Murcia, Spain | Manufacturing | 1 fatality, 3 injured | Explosion at an explosives plant, likely while workers were cleaning |
2006 | Espoo, Finland | Transport | 10 injured | Explosion on a construction site caused by a falling rock hitting a truck carrying ~30 kg of dynamite |
2006 | Bao, Vietnam | Use | 5 fatalities, 2 injured | Unplanned explosion of an explosives batch in a limestone quarry |
2008 | -, India | Storage | 8 fatalities, 17 injured | Explosion of blasting materials in a storage magazine at a mining site |
2008 | Rasvumchorrsky, Russia | Use | 13 fatalities, 5 injured | Explosion during pneumatic loading of ANFO mixture into boreholes in an underground mine |
2010 | Karadiyanaru, Sri Lanka | Transport/Unloading | 25 fatalities, 52 injured | Explosion of containers with road construction explosives |
2011 | -, Bulgaria | Use | 2 fatalities | Unplanned explosion of explosives in an underground mine |
2012 | Yingde, China | Transport/Unloading | 10 fatalities, 20 injured | Detonation of detonators during unloading of delivery truck at a mine |
2013 | -, Peru | Use | 2 fatalities | Unplanned dynamite explosion in a mine |
Accident ID | Accident Title | Start Date | Seveso II Status | Industry Type | Accident Description |
---|---|---|---|---|---|
000956 | Explosions in a pyrotechnic workshop causing several casualties | 31 August 2015 | Upper tier | Production and storage of fireworks | Several explosions occurred within seconds. Based on fragment distribution, the initial blast likely originated in drying installation no. 23, in the colours manufacturing area, possibly while a worker was handling production samples. The subsequent explosions spread through the powder and colour storage areas, reaching the assembly section. According to emergency teams, an industrial truck nearby, loaded with explosives, may have intensified the blast and contributed to the propagation of the shockwave. |
000008 | Explosion and fire at a facility handling explosive substances | 8 September 2015 | Upper tier | Production, destruction and storage of explosives | Due to an internal fault in the kneading process in a kneader (kneading powder cake), an explosion occurred, resulting in a fire Safety function: Blast wall, automatic supply of extinguishing water, fire brigade automatically alerted. |
001069 | Fire of smokeless powder | 9 September 2015 | Upper tier | Production, destruction and storage of explosives | Burning smokeless dust on the ramp of an object and then extending the fire to the entire object. Because of the smokeless dust feature, the whole object burned. |
001071 | Explosion of warehouse of explosives | 21 September 2015 | Upper tier | Production, destruction and storage of explosives | An explosive initiation and a subsequent detonation occurred during the transfer of the explosive and explosive composition and the movement of the explosives during the process. |
001068 | Explosion and Fire | 23 February 2017 | Upper tier | Production, destruction and storage of explosives | An explosion in an ammunition factory. The accident occurred when pressing charges of plastic explosives. |
001074 | Explosion of nitroesters | 2 March 2017 | Upper tier | Production, destruction and storage of explosives | The accident occurred during construction work inside the blending unit. An electric hammer struck nitroesters unexpectedly present in the concrete floor, causing an explosion. Prior to the works: (a) the unit had been shut down (no pro-duction, storage, or transport of hazardous substances); (b) the floor was cleaned with 10% NaOH solution; (c) contractors received training according to internal procedures. |
001108 | Explosion in bunker for manufacturing detonators | 7 May 2017 | Upper tier | Production, destruction and storage of explosives | An explosion occurred in the cap loading line room at Orica Sweden AB’s Gyttorp plant, where detonators are filled and pressed with explosives and delay compositions. One operator presents at the time suffered fatal injuries. The accident happened during a shift change, with no witnesses. Damage was confined to the cap loading line room. |
001149 | Explosion and release of substances in an explosives production plant | 26 October 2018 | Upper tier | Production, destruction and storage of explosives | Explosion in the crushing room. |
001332 | Combustion of smokeless powder | 1 November 2019 | Upper tier | Production, destruction and storage of explosives | The dropping of a 70 kg handling package on the floor, which contained dry smokeless powder, caused the ignition and combustion. |
001220 | Explosion at a plant producing, destroying and storing explosives | 21 December 2020 | Upper tier | Production, destruction and storage of explosives | On 21 December 2020 at around 2:15 p.m., an explosion occurred near room 80 during the incineration of explosive materials in a static furnace. The blast originated under the canopy near the furnace, where materials were fed via a metal slide. At the time, nautical flares, composite propellant fragments, and TNT-contaminated wood were being destroyed. The explosion, likely about 2 m from the left side of the furnace, caused fatal injuries to three workers present. |
001295 | Explosion in an explosives storage facility | 10 November 2021 | Upper tier | Production, destruction and storage of explosives | Police and internal investigations, supported by experts, ruled out electrical faults, third-party interference, or atmospheric causes. An expert report confirmed no link between the electrical system and the fire. The operator assumes spontaneous combustion of nitrocellulose (NC) as a possible chemical cause, leading to a fire in the storage chamber and subsequent deflagration. The blast blew off the bunker roof, scattering debris up to 50 m, with some items found 100 m away. The impact stayed within legal hazard limits and safety margins. Post-incident, the area was safe, and no urgent measures were required beyond temporary closure. |
Date | Location | Casualties | Type of Incident |
---|---|---|---|
21 August 2008 | KGHM Rudna | 1 slightly injured | Detonation of a drilled misfire |
22 January 2010 | Mine Strzelin | 0 | Flyrock |
25 February 2010 | KGHM Lubin | 1 fatality, 3 severely injured, 1 slightly injured | Drilling into a loaded and primed blast hole |
13 March 2010 | KGHM Lubin | 1 slightly injured, 1 severely injured | Drilling into a misfire and detonation |
26 August 2010 | KGHM Polkowice-Sieroszowice | 1 slightly injured | Drilling into a misfire and detonation |
2 September 2010 | Mine Ogorzelec | 0 | Flyrock |
12 October 2010 | Mine Józefka | 1 slightly injured | Misfire detonation during mucking |
21 October 2011 | Hard Coal Mine Mysłowice-Wesoła | 1 slightly injured | Worker struck by flyrock after unauthorized presence in danger zone |
21 August 2012 | Hard Coal Mine Ziemowit | 1 slightly injured | Worker struck by flyrock after unauthorized presence in danger zone |
26 July 2013 | Mine Czernica-Granit | 1 severely injured | Worker struck by flyrock after drilling into misfire during secondary rock splitting |
2 July 2014 | Mine Barwałd Dolny | 0 | Flyrock |
11 July 2015 | Hard Coal Mine Sośnica | 4 slightly injured | Methane ignition due to improper blasting operations |
15 June 2016 | Mine Łagów IV | 0 | Flyrock |
16 June 2016 | Mine Chwałków I | 0 | Flyrock |
31 July 2017 | Mine Łagów II | 0 | Flyrock |
23 October 2017 | Mine Strzelin | 0 | Flyrock |
25 March 2018 | Hard Coal Mine Ruda Bielszowice | 1 slightly injured | Worker struck by flyrock after unauthorized presence in danger zone |
12 April 2018 | Mine Łażany II | 0 | Flyrock |
13 March 2019 | Mine Osielec | 0 | Flyrock |
18 July 2019 | Mine Małogoszczt | 0 | Flyrock |
17 June 2020 | Mine Łagów IV | 0 | Flyrock |
24 August 2020 | Hard Coal Mine Bobrek-Piekary | 1 slightly injured | Hammer impact on undetonated explosive from previous blasting |
13 April 2022 | Mine Chwałków I | 0 | Flyrock |
6 May 2022 | Mine Tłumaczów Wschód | 0 | Flyrock |
8 May 2023 | Mine Mucharz | 0 | Flyrock |
24 October 2023 | Mine Kujawy | 0 | Flyrock |
6 February 2024 | Mine Kujawy | 0 | Flyrock |
7 June 2024 | Mine Skała 1 | 0 | Flyrock |
22 April 2025 | Mine Żelatowa | 0 | Flyrock |
Classification Criterion | Type/Description |
---|---|
Hazards by Job Position | Specialist positions (blasting supervisor, shotfirer, explosives issuer, shotfirer’s assistant) |
Specialist positions not explicitly regulated by mining law (MEMU operator, escort personnel, explosives transport driver) | |
Non-specialist positions not directly handling explosives (excavator operator, loader operator, rock miner) | |
Hazards by Activity in Blasting Operations | External transport on public roads |
Internal on-site transport | |
Storage of blasting agents | |
Priming and loading explosives into blast holes | |
Preparation and connection of the initiation system | |
Initiation of explosive charges | |
Post-blast face inspection | |
Auxiliary and emergency operations | |
Hazards by Technology or Type of Explosive Used | Mechanized loading of emulsion or ammonium nitrate-based explosives |
Manual loading of nitroester-based explosives | |
Hazards by Potential Consequences and General Mining Hazards | Hazards likely to cause fatal accidents (e.g., due to weather, rockfall from unstable overhangs) |
Hazards likely to cause disability or occupational illness (e.g., exposure to vibration, noise, dust) | |
Hazards likely to cause temporary health issues (e.g., poor ergonomics, physical or mental overload) |
T—TECHNICAL CAUSES (Related to Equipment, Materials, Infrastructure) | |||
---|---|---|---|
No. | Question | Answer (Yes/No) | Remarks |
1. | Was the equipment technically operational? | The main equipment involved consisted of a drilling rig and an excavator. | |
(a) During blasting operations | Yes | ||
(b) During excavator operation | No | ||
2. | Were appropriate technical safeguards (shields, locks) applied? | The use of technical safeguards during blasting operations is not feasible due to the technological process. The excavator was not equipped with windshield protection. | |
(a) During blasting operations | Yes | ||
(b) During excavator operation | No | ||
3. | Were environmental conditions (lighting, noise, temperature) adequate? | The operator was working during the third shift under artificial lighting. | |
(a) During blasting operations | Yes | ||
(b) During excavator operation | No | ||
4. | Were appropriate tools/materials used? | The tools and materials used complied with the blasting log and the extraction technology design. | |
(a) During blasting operations | Yes | ||
(b) During excavator operation | Yes | ||
5. | Were the materials and means used free of defects? | It cannot be definitively ruled out that the detonator was defective. | |
(a) During blasting operations | No | ||
(b) During excavator operation | Yes | ||
6. | Were the devices free of malfunctions and damage? | Blasting and loading operations proceeded without complications or deviations from the plan. | |
(a) During blasting operations | Yes | ||
(b) During excavator operation | Yes | ||
O—ORGANIZATIONAL CAUSES (related to management, procedures, supervision) | |||
No. | Question | Answer (Yes/No) | Remarks |
1. | Was there a documented procedure for the performed task? | An appropriate blasting log and extraction plan were in place. | |
(a) During blasting operations | Yes | ||
(b) During excavator operation | Yes | ||
2. | Was the employee properly trained? | Employees were qualified to perform their assigned duties. | |
(a) Shotfirer | Yes | ||
(b) Excavator operator | Yes | ||
3. | Was supervision present and acting appropriately? | Supervision by an authorized person is mandatory during blasting operation. | |
(a) During blasting operations | Yes | ||
(b) During excavator operation | Yes | ||
4. | Were the work schedule and shift organization appropriate? | Blasting operations were carried out on the first shift, and mucking was performed during the third shift. | |
(a) During blasting operations | Yes | ||
(b) During excavator operation | Yes | ||
5. | Was communication maintained (e.g., between shifts)? | Information about work progress was exchanged between supervisory personnel during shift transitions: from the first to the second and from the second to the third. | |
(a) During blasting operations | Yes | ||
(b) During excavator operation | No | ||
L—HUMAN CAUSES (related to behaviour, mistakes, psychophysical condition of the worker) | |||
No. | Question | Answer (Yes/No) | Remarks |
1. | Was the worker equipped with and using personal protective equipment (PPE)? | Employees were equipped with personal protective equipment in accordance with the occupational risk assessment. | |
(a) Shotfirer | Yes | ||
(b) Excavator operator | Yes | ||
2. | Did the worker follow the applicable instructions? | It cannot be clearly determined whether the shotfirer verified the correctness of the connection or failed to detect any faults. | |
(a) Shotfirer | No | ||
(b) Excavator operator | Yes | ||
3. | Was the worker rested and focused? | The operator’s third-shift work may have affected his psychophysical condition. | |
(a) Shotfirer | Yes | ||
(b) Excavator operator | No | ||
4. | Were the worker’s behaviours compliant with safety principles (absence of risky actions)? | Employees did not engage in any risky behaviours. | |
(a) Shotfirer | Yes | ||
(b) Excavator operator | Yes | ||
5. | Was the worker aware of the hazards associated with the task? | Authorization to perform the work was granted based on a signed acknowledgment of the occupational risk assessment. | |
(a) Shotfirer | Yes | ||
(b) Excavator operator | Yes |
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Nowak-Senderowska, D.; Pyra, J. Accidents in the Production, Transport, and Handling of Explosives: TOL Method Hazard Analysis with a Mining Case Study. Appl. Sci. 2025, 15, 10150. https://doi.org/10.3390/app151810150
Nowak-Senderowska D, Pyra J. Accidents in the Production, Transport, and Handling of Explosives: TOL Method Hazard Analysis with a Mining Case Study. Applied Sciences. 2025; 15(18):10150. https://doi.org/10.3390/app151810150
Chicago/Turabian StyleNowak-Senderowska, Dagmara, and Józef Pyra. 2025. "Accidents in the Production, Transport, and Handling of Explosives: TOL Method Hazard Analysis with a Mining Case Study" Applied Sciences 15, no. 18: 10150. https://doi.org/10.3390/app151810150
APA StyleNowak-Senderowska, D., & Pyra, J. (2025). Accidents in the Production, Transport, and Handling of Explosives: TOL Method Hazard Analysis with a Mining Case Study. Applied Sciences, 15(18), 10150. https://doi.org/10.3390/app151810150