Dust Monitoring Systems and Health Hazards in Coal Mining A Review

International Journal of Trend in Scientific Research and Development (IJTSRD)
Volume 5 Issue 3, March-April 2021 Available Online: www.ijtsrd.com e-ISSN: 2456 – 6470
@ IJTSRD | Unique Paper ID – IJTSRD38712 | Volume – 5 | Issue – 3 | March-April 2021 Page 172
Dust Monitoring Systems and Health
Hazards in Coal Mining: A Review
Brajesh Kumar Kori1, Dr. Himanshu Agrawal2
1Research Scholar, 2Associate Professor,
1,2Department of Mechanical Engineering, Government Engineering College, Jagdalpur, Chhattisgarh, India
ABSTRACT
The dust produced during mining operation causes critical illness to miners.
The mining workers are constantly attherisk ofgetting respiratoryillnessdue
inhalation of mining dust, particulate matter (PM) and heavy metals. The
current research studies the hazards of mining and effect of coal dust on
health of workers. The instruments that can be used to measure quartz
content, coal dustconcentrationisalsodiscussed.Themathematical modelling
of dust dispersion is also studied.
KEYWORDS: Coal mine, coal dust, health hazards
How to cite this paper: Brajesh Kumar
Kori | Dr. Himanshu Agrawal "Dust
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1. INTRODUCTION
Dust is used to describe fine particles suspended in the air.
The size of dust particles vary from few nm to 100µm and
the concentration of dust vary from few micrograms to
hundreds of micrograms per cubic meter of air. Various
factors such as dust lifted by weather, volcanic eruptions,
pollutions, mining activity, construction activity etc.
contribute to the formation of dust. The formation of dust
can be attributed to the fine particles which become
entrained in the atmosphere due to turbulent disturbances
produced by wind; it is also formed from mechanical
disturbances and through release of particulaterichgaseous
emissions. Dust includes wide range of particles varying
from 1mm to less than 1µm. But the size range normally
varies from 1-20µm. because particles above 20µm are
usually quick to settle and particles below 1µm don’tform in
abundance. The size of particle considerably influences its
characteristics. Depending upon the size dust can be
classified as
1. Particles greater than 10µm: These particles settle
according to the law of gravity. In still air, they settle
with increasing velocity.
2. Particles between 0.1µm to 10µm: These particlessettle
with a constant velocity obeying Stoke’s law. The
velocity depends upon density and size of particles,
acceleration due to gravity and viscosity of the medium.
3. Particles between 0.01µm to 0.1µm: These particles
don’t settle in air rather remains in colloidal state.
Atmospheric dust is formed by saltation andsandblastingof
sand seized grains from surfaces through the action of wind.
Troposphere is themedium oftransportationofatmospheric
dust. Mostly atmospheric dust comes from the dry and arid
regions which are more susceptible to weathering through
high velocity wind. During dust generation particulate
matter became airborne and flows in the downwind
direction. When a dust is derived from a mixture of sources
or when the source can’t be easily determined, then it is
termed as fugitive dust. In mining activities fugitive dust
generates from the movement of HEMM over non paved
haulage roads and from blastingandloadingoperation.Mine
dusts are generally characterized as fugitivedustssincethey
are mostly generated fromnon-pointsources.Duringmining
and processing of ore body a number of stages of drilling,
blasting, crushing, grinding are required. Abrasion and
crushing of surface due to action of mechanical force
produced fine particles which remain suspended in air due
to small size. The movement of dumpers and other HEMM
along the haul road also produces dust. In most of the cases
the dust produced by the mine is of fugitive nature i.e. the
sources can’t be easily defined and mainly consists of
disturbances of surface. Surface mining methods produces
significant amount of dust as comparedtoundergrounddust
due to use of HEMM, high mechanisation and large surface
area which are vulnerable form dust production on action of
air. In opencast mines, huge quantity of over burden has to
be removed to facilitate accessing minerals. The removal of
overburden requires dumpers, shovels, and draglines etc
IJTSRD38712

International Journal of Trend in Scientific Research and Development (IJTSRD) @ www.ijtsrd.com eISSN: 2456-6470
which discharge enormous quantity of fine particles into
atmosphere.Blastingoperationstoogenerateshuge quantity
of dust. The closure of mine also involves loading and
transportation of overburden and contributes to dust
generation. Large surface area of overburden dump is also
quite vulnerable to dust production if efficient measuresare
not taken to suppress it. Most mining operations produce
dust when air-borne becomes serious hazard to miner’s
health and may cause respiratory diseases e.g. chronic
bronchitis/pneumoconiosis. It can be collage nous/non-
collage nous (non-fibrogenic). Based onsizeparticulatescan
be divided into TSP, PM10 and PM2.5. Dust is generally
measured in terms of weight of particles per cubic meter of
air. Dust is a primary thing associated with all mining
activity. In every step of operation there is generation of
dust. Open cast mines produces more dust as compare to
underground mines. The mining activities like drilling,
blasting, loading, transportation, crushing, conveying, haul
road and the exposed overburden face generate large
quantities of fugitive dust. In view of this, identification dust
emission sources and determination of emission rate of
various activities of the mine site is pertinent to assess
impact of mining activities on surrounding air quality. Silica
is a potential carcinogen and its exposure to the workers
may be detrimental to their health which may result in
progress of silicosis and lung cancer.Hencedetermination of
silica content in the respirable air is essential to assess its
impact on miner’s health. Dust emission,dispersionpatterns
are difficult to predict through dispersion models due to the
wide range of fugitive sources in mining activities that may
give rise to dust, empirical emission factors for these
activities, and the impact of local meteorology and
topographic features. Dispersion modelling can provide
simple predictions of probable isopleths, and ambient air
quality monitoring can provide validation of possible levels
of dust concentration in and around a site. In order to
accurately predict dust concentration levels around the
mine, long-term and comprehensive dust monitoring is
essential. Dust dispersion patterns are often affected by
wind speed, short lived dusting events, precipitationandthe
source of emission itself. Sometimes dust emission from the
mining site itself may be low or immaterial, but the receptor
may be subjected to background dust sources. Coal dust
plays a significant role in the gas explosion process.
Meanwhile, coal dust can also cause explosion itself. Coal is
an inherently combustible material, and when it is broken
into dust, the contact area between coal and air significantly
increases, leading to a higher explosion potential once an
ignition source appears. The shockwaves generated by
earlier explosions will raise secondary dust in the roadway,
resulting in explosion propagation, which poses a great
threat to miners and the mine. In addition, dust particles,
containing harmful elements (e.g., silica), with an average
diameter of less than 2.5 μm can directly enter the alveoli in
the human body and combine with toxic host cells
(especially macrophages) to cause permanent damage,7
leading to pneumoconiosis and other diseases.8−12
Moreover, dust can also accelerate the mechanical wear of
equipment and reduce the visibility of the working face,
thereby increasing the risk of safety hazards. In the past,
much concerns have been concentrated onthepreventionof
sudden accidents rather than on the harmful influence of
coal dust on the human body. In recent years, social and
technological progresshasledtoenhancedhealthawareness
and an ever-increasing emphasis on dust reduction in coal
mines. The Chinese government issued the Technical
Specifications of Comprehensive Dust Control Measures for
Underground Coal Mines,whichrequirescoal minestoadopt
strict dust reduction measures. Therefore, the systematic
study of dust characteristics is related to personal health,
production safety, andenvironmental airquality,i.e.,the HSE
of the underground space of the mine. The working face
generatesabout60%ofthetotalamountofdustinacoalmine,18
which deserves the focus of control efforts.Thestudyofdust
characteristics is an important step toward achieving the
goal of dust control. Historical studies were conducted
mainly by crushing coal in a laboratory to generate dust
rather than collecting dust from the working face,
19−22whichwasunrealistic because the chemical
composition, particle size,wettability,andharmful elements
of real dust are different depending on individual coal types
or the surrounding rock. The proximate analysis results
(Table 1) show that the dust in each mine is mainly
composed of organic matter, alongwithdifferentamounts of
minerals. The ash content varies greatly among the mines
within the range of 12.59−77.08% (avg. 28.85%). However,
in the same mining area, the ash content of the dust fromthe
working face dust is always higher than that of thedustfrom
the air intake roadway and there turn air road way. In
particular, the ash content of JLS-2 reaches 77.08%, while
those of JLS-1 and JLS-3 are only 22.34 and 36.69%,
respectively. The ash content of the dust from the different
positions of Hebi no. 6 (HB6) showslowdifferences,withthe
ash content of HB6-2 of 17.83% and those of HB6-1 and
HB6-3 being17.30 and 14.7%, respectively. It can be seen
that the dust composition is complex.
Table 1 Proximate Analysis of Dust
There are quite a number of ways in which monitoring
airborne dust can be carried out. Based on principles of
operation, they can be classified as
A. Filtration
B. Sedimentation
C. Inertial precipitation
D. Thermal precipitation
E. Electrical precipitation
F. Optical methods based on light scattering
However, for this study DustTrak II is used for real timedust
monitoring at different sources of mine. It is based on the
principle of scattering of light. Personal Dust Sampler is
based on the principle of filtration. DustTrak II aerosol
monitor gives the real time aerosol massreadings.Itisbased
upon the principle of light scattering through the laser
photometer. It uses a sheath system which isolates the

aerosol in the optic chamber to keep optic clean and to
improve reliability. It can be used in harsh industrial
workplaces and construction sites.Itmeasuresaerosolssuch
as dusts, smokes, fumes and mists. Dust Track hand held
model 8532 is light weight and portable. It can monitor
indoor air quality, engineering control evaluations and for
baseline trending and screening. It has single point data
logging capability which can be used for walk through
industrial sanitation survey and indoor air quality surveys.
DustTrak II instrument is shown in Fig. 1.2.
Figure 1.2: DustTrak II Aerosol Monitor
2. LITERATURE REVIEW
During almost all mining activitiestherearevariousformsof
activities from mining extraction to refinery thatputtherisk
of workers and communities at risk due to dust from such
activities that pollute the mining and nearby surrounding to
endanger the health of those in close proximity mining
environment [1, 2]. Actually themostnotabledust emissions
are usually particulate matter (PM), sulfur dioxide (SO2),
nitrogen dioxide (NO2) and heavy metals and mostly these
are suspended as dust in the mining environment. It should
be noted that dust from mine environment is a verybigissue
as it deteriorate air quality and ultimately affect the human
health, flora and fauna in and around coal mining areas [3].
The novella article, by Momoh et al., is a very explicit articles
in terms of leveraging mining dust effects to human health
both within mining environment and communities within
their vicinities [4]. Thearticle“Potential implicationsof mine
dusts on human health: A case study of Mukula Mine,
Limpopo Province, South Africa” published in 2013 is an
important article because it is very comprehensive in
establishing what dust particles are unacceptable by WHO
standard. The purpose of this study was to estimate levelsof
Suspended Particulate Matter in ambient air within mining
environment and the potential risks to mineworkers and
communities nearby. While the “Respiratory Diseases
Caused by Coal Mine Dust” by Laney and Weiss man is
informative and insightful becausetheauthorsemphasizesa
spectrum of respiratory diseases that affect miners as a
results of dust from the mine environment termed as “coal
mine dust lung disease” though the paper does not address
the effects of mining dust on community living in close
proximity, the main objective of the paper is to provide an
update on respiratory diseases caused by coal mine dust.
The paper by Rey et al., in his paper “Underground Coal
Mining: Relationship between Coal Dust Levels and
Pneumoconiosis, in Two Regions of Colombia, 2014”
published in 2015 observed that there was a high levels of
coal dust and silica among the 29 companies that were
sampled and that the prevalence of pneumoconiosis was
much higher than what has been reported in other studies
among mine workers [5]. Other studies focused on levels of
dusts observed from small scale mining, like a studydone by
Bråtveit, Moen, Mashalla and Maalim in 2002 called “Dust
Exposure During Small-scale Mining in Tanzania: A Pilot
Study”. This paper discusses that there is actually more dust
produced from small scale mining that what has been
assumed and if the focus is only on economic strides this
may make sustainable mining difficult. The objectivesofthis
pilot study were to monitor the exposure to dust during
work processes, which are typical of small-scale mining in
developing countries, and to make a rough estimation of
whether there is a risk of chronic pulmonarydiseasesfor the
workers [6]. Lastly a paper done by Önde in a paper
published in “Investigation of Dust Levels in Different Areas
of Underground Coal Mines”. The paper found that levels of
mining is too high and there is need to control these levels.
It should be stressed that Health and safety is always the
first priority in the mining industry. It requires not only to
provide a safe workplace for mining operations, but also to
offer a safe and sustainable environment for the
communities around the mine-site. Some of the pertinent
issues form mining environment that arise during an entire
mine life cycle include the following categories: general
workplace health and safety and the hazardous substances
such as dusts that come as a result of theprocessesofmining
[7].
It should be understood that most if not all mining
operations produce dust and this may result in various
spectrum of health issues as far as the community is
concerned and most importantly the health of workers e.g.
chronic bronchitis/pneumoconiosis. Dustintheminingarea
could simply be viewed as particulates matters and this can
be divided into TSP, PM10 and PM2.5. At the same time it is
should well be understoodthatdustisgenerallymeasuredin
terms of weight of particles per cubic meter of air. There is
an inherent and well understood association between
mining activity and the resulting dust and this association is
progressive in every step of miningoperations.Itshouldalso
be well noted that open cast mines produces more dust as
compared to underground mines. From the above rationale,
the paper by Abuh et al., does highlight that mine are as a
result of mining activities’ and the paper explains the
different and various constituents of dust, methodologically
however the paper does not seem to provide much
information on what methodsofdata collectionwereusedas
this could be important to understand the study findings. As
far as dust and mining environment is concerned every
paper to address this issue should endeavor to address both
the workers and community impact of dust.Thispaperseem
to shed much emphasis on community concerns as farasthe
effects of dust is concerned on their health compared to
other papers. The study does not also provide a progressive
way for control and monitoring of dust in mining
environment in light of sustainable mining. At thesametime
the study seem to establish an important that exposure fora

risk really dependent on the dust levels. While a study by
Laney and Weismman states that the most important aspect
which is the fact that mining is very important for
community and global economies and for the advancement
of welfare of workers and community living. The study
strikes a balance unlike the other studies, that when
addressing dust effects on environments and human health,
it is important that the benefits are weighed against the risk
because given any situation any mining operations will
continue to provide dust, but what matters is the amount of
dust that is generated and the levels and how they risk
workers and community health as well as the environment.
This study however just like the preceding study does not
provide for mechanismofsustainablemanagementofdustin
mining environments to curtail on the impacts of dust on
workers and human health. Thestudytooonlyaddresses the
health of workers as far as dust is concerned and fails to
addresses the proximity of dust effects on communities [8]
Rey et al., study addresses coal dust mining and its effectson
environment within mines and beyond. This was study was
methodologically meaningful in proving reliable and valid
results and this is because it was carried out as cross
sectional analytical interventional study with the use of
instruments to measure amount of dust in mining
environment as well as the effects of dust on the workers
and this was not merely dependent on other studiesreports.
The study also did establish one important factor that the
other studies seem to fail to addressee and that is the past
medical history of workers. This important as other worker
smoke and are exposed to other pollutants other than that
which come from the mines. This is an important
investigation as the findings of a study could be confounded
by any other exposure that inherently existamongthosethat
work in the mines [5].
A study by Onder, is methodologically robust among all the
studies because this study made use of records of dust
measurements in the mining environment since the 1978
until 2006. This could be helpful to understand the trends in
dust production over the years. Thus, information could be
utilized to come up with sustainableworkablemeasuresthat
could address the growing concern of dust in mining.
However, this study does no conclusively and
comprehensively reports on the findings of such reviews.
One feature that seem to fall short in the studies is the
mention of an intersectoral approach when doing mining
[10]. A study by Billig et a’ suggest that an intersectoral
approach involving community, governmental and
nongovernmental agencies, and the management of the
mining firm. And from this study it appears success was
achieved using this approach in addressing dust from the
mining environment [9, 10]
Chaulya et al. (2002) [11] carried out study for
determination of emission rateforSPMtocalculateemission
rate for various opencast mining activities. For validation
Fugitive Dust Modelling (FDM) and Point, Area and Line
source model (PAL2) were used.Bothmodelsrunseparately
for the same input data for each mine to get predicted
concentrations at three receptor locations. FDM was found
to be more suitable for Indian mining conditions. It was
observed that coal handling plants, haul roadsandtransport
roads were the major sources of dust emission. The average
accuracy between observed and predicted values for SPM at
certain locations for PAL2 and FDM model were found to be
60-71% and 68-80% respectively.
Chaulya (2004) [12] carried out an assessment of air quality
around Lakhanpur area of Ib valley. TSP, PM10, SO2, NOx
were monitored at 13 locations for a period of one year. 24
hour and annual average concentrations of TSP and PM10
exceeded NAAQS standards whereas SO2andNOxremained
within the limit. 31.94% of TSP was found to be within
PM10. Green belts were prescribed as a mitigation measure.
Erol et al. (2013) [13]examined the quartz content in
respirable dust in the working faces of coal mines and
evaluated the risk of getting pneumoconiosis among the
workers working at coal faces. Dust samples were collected
using MRE 113A dust sampler and the quartz content of the
dust was determined using FTIR. The mean respirable dust
concentration at most the coal faces were above the limit.
Analysis of variance (ANOVA) was performed to determine
the effect of workplace and seam characteristics on dust
levels. They found a remarkable variation of respirable dust
and quartz content at different seams and collieries.
Ghosh and Majee (2007) [14] have conducted an
investigation to determine air borne dust created by
opencast mines at Jharia coalfield. Particles were more
respirable in nature withmediandiameter20µm.Work zone
air was found to contain moreTSP,RPMandbenzenesoluble
matter than ambient air. Highest concentration of SPM was
found at Dragline section and the next lower concentration
at haul road. At feeder TSP was found to be the highest.
Respirable particulate matter was found to be highest in
summer. TSP concentration at day time was found to be
highest compared to other two time periods as majority of
the works were done during general shifts (from 0800hrs to
1700hrs). TSP concentrations at almost all locations exceed
the permissible limits by CPCB during winter, summer and
monsoon period. The weight percentage of respirable
fraction in haul road TSP was found to be more than that of
feeder breaker TSP.
Kumari et al. (2011) [15] carried out a study to determine
quartz content in airborne respirable dust (ARD)usingFTIR
spectrometer. Personal dust samplers were used to collect
airborne respirable dust at different locations of the mine
using GLA-500 PVC membrane filters. Percentage of quartz
was found to be less than 1% in almost all workings atJharia
coalfield. Maximum Exposure Limit (MEL) was equal to
3mg/m3 in most of the working places. However in case of
metal mines, quartz content was found to be more than 5%
in many workings. It has been found that good ventilation
and wet drilling controls the dust problematsomelocations,
whereas in some other locations rotations of workers are
required.
Mukherjee et al. (2005) [16] assessed respirable dust, free
silica content and personal exposure of the miners to find
the risk of coal worker’s pneumoconiosis in 9 coal mines of
eastern India during 1988-91. MRE113 and AFC123 were
used for dust monitoring and the samples were analysed in
FTIR. Dust levels in the return air in both B&P and Longwall
are found to be above permissiblelimit.Drilling,blastingand
loading were the major sources of dust emissions. Exposure
of driller and loader were more affected in B&P workings,
while DOSCO loader, powersupportfaceworkerandshearer
operator were more exposed in Longwall working. In
opencast mining, driller and compressor operatorswerethe
major exposed groups. The percentage of free silica is found
to be less than 5% in most cases except amongquarryloader
and drillers in opencast mines.

Mishra and Jha (2010) [17] carried out dispersionmodelling
in an opencast coal mine and validated the results with the
actual field data. The research was aimed for the validation
of FDM model. They have assessed activity wise dust
generation potential and studied distance vs dust
concentration to determine impact zone of dust
concentration. Major polluters were haul road and coal
transportation road. Dust emission from the mine was
directly proportional to the lengthofthetransportationroad
and to the speed of vehicle. Fugitive dust modelling used for
dust dispersion modelling was 90% accurate in predicting
dust concentration. They have found that dust particles are
largely deposited within 100m. Concentration decreases
with increase in distanceawayfromsourceandwithin300m
to 500m after which it reaches background concentration.
Also 80% of dust generated by thehaul trucksisgreaterthan
10µm.
Trivedi et al. (2008) [18] examined different sources of dust
generation and calculated dust emissions from different
point, line and area sources in an opencast coal mine. They
have carried out air quality modelling using Fugitive Dust
Model. Dust produced by different mining activities doesn’t
add to ambient air quality beyond 500m. Modified Pasquill
and Gifford formula was used to determine level emission
rate. Predicted value of suspended particulate matter was
found to be 68-92% of the observed value. An exponential
fall in TSPM concentration with distance from source had
been observed. Dust generation due to miningactivitydidn’t
contribute to ambient air beyond 500m.The mainsourcesof
dust emission were loading and unloading of coal,
overburden and haul road.
Buchanan et al. [19] found no significant association
between cumulative respirable dustandopacities2/1+after
adjustment for quartz. However, the absolute risk for
opacities 2/1+ after 15 years’ exposure to nonquartz
respirable dust was 0.8%.
Seaton et al. [20] found that cases (change in opacities
progression of at least 1+) had been exposed to higher %
quartz but lower % coal and concluded that quartz might be
an important factor in the development and rapid
progression of opacities.
3. CONCLUSION
The scholars have conducted various studies onsourcesand
causes of coal dust dispersion. The findings from most ofthe
researches have shown that the effect of coal dust on
ambient atmosphere is upto 500 meters. The Fugitive Dust
Model is also presented by scholars which predicted the
dispersion of dust particles on ambient airandinmineswith
90% accuracy. The studies conducted by international
institutions like WHO has raised concerns on respiratory
illness (interstitial lung disease)caused due to mining
activity. The safe concentration of various suspended
particles like particulate matter (PM), sulfur dioxide (SO2),
nitrogen dioxide (NO2) and heavy metals are also studied.
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