historical research report - Institute of Occupational Medicine

Transcription

HISTORICAL RESEARCH REPORT
Research Report TM/74/05
1974
Pneumoconiosis Field Research:
Environmental conditions at Linby
Colliery, 1972/73
Sinha MM, Annis R
HISTORICAL RESEARCH REPORT
1974
Pneumoconiosis Field Research: Environmental
conditions at Linby Colliery, 1972/73
Sinha MM, Annis R
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INSTITUTE OF OCCUPATIONAL MEDICINE
Research Avenue North, Riccarton, Edinburgh, EH14 4AP
Tel: +44 (0)870 850 5131 Fax: +44 (0)870 850 5132
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ii
NOT FOR PUBLICATION
I N S T I T U T E
REPORT NO. TM/74/5
O P
O C C U P A T I O N A L
M S D I C I N
PNSUMOCOKIOSIS PI3LD RESEARCH '
•
ENVIRONMENTAL CONDITIONS AT LINBY COLLIERY, 1 9?2/73
ty
M.M. Sinha and R. Annis
Environmental Branch
Institute of Occupational i-Iedicine
Koxburgh Place
Bdinearth. 2H8 93U
(Tel. No. 031-667-5131)
•
April, 1974
REPORT NO. TH/74/5
I N S T I T U T E
O P
M E D I C I N E
PNEUKOCQN103IS FIELD RESEARCH
ENVIRONMENTAL CONDITIONS AT LlilBY COLLIERY, 1972/73
M.M. Siriha and R. Annis
CONTESTS
SUMMARY
1.
INTRODUCTION
2.
LIIJBY COLLIERY
2.1
Colliery details
2.2
Ventilation and dust suppression
2.3
Manpower and occupational groups
3.
SAMPLING AND EVALUATION
3.1
Sampling programme
3.2
Sampling method and evaluation
4.
RESULTS AND DISCUSSION
4.1
Faceworkers
4.2
Non-faceworkers
4.3
Environmental summary
4.4
Relationship between control point and face concentrations
4.5
Total dust measurements
4.6
Estimated concentrations
4.7
Special investigations
REFERENCES
TABLES 12_14
REPORT HO. TK/74/5
I N S T I T U T E
O F
M E D I C I N E
PHEUKOCONIOSIS FIELD RESEARCH
ENVIRONMENTAL CONDITIONS AT LINBY COLLIERY, 1972/73
by
SUMMARY
This report tabulates respirable dust concentrations and compositions
at Linby Colliery for the period April 19?2 to March 1973. Information
regarding seams worked, outputs, methods of working, dust suppression
and manpower together w i t h the associated dust concentrations is
.presented in a series of face charts.
At Linby Colliery the coalface mean respirable dust concentration
was 5.7 mS/m . The mean ash content of the respirable dust sampled
was 63,6 per cent and the mean quartz content was 9.5 P^r cent
(concentration 0.54 ing/nr ).
Total dust concentrations are also given,
and on the average were 5.4 times as high as respirable dust concentrations.
PNETJI.'OCONIOSIS FIELD RESEARCH
ENVIRONMENTAL CONDITIONS AT LINBY COLLIERY, 1972/73.
1.
INTRODUCTION
This report lists and examines environmental measurements made at
Linby Colliery during the period April 1972 to March 1973. Routine
dust measurements were made with the K.R.E. Gravimetric Sampler
Type 113A.
The stratification of manpower and method of sampling, almost exclusively
by volunteer carriers, were as described previously (Sinha, 19?2).
Dust concentrations, which formed the bulk of the measurements, are
presented mainly in a series of charts with the relevant comment in
•footnotes. Of particular interest is the presentation of mean
concentrations for different sites and occupations in each face area.
The composition of the dust is also given. The report gives general
information about the colliery, notes groups for which volunteer
carriers were not obtained and supplies estimates of concentrations.
The relationship between dust concentrations at control point sampling
points in return roadways and on faces is examined and 'total dust 1
concentrations are n o t e d , f o r fifty-four occupational groups and control
sampling points of seven faces.
2.
2.1
Colliery details
(i)
Location;
(ii)
Seams worked;
'
LINBY COLLIERY
Linby colliery is situated about seven miles from
Nottingham in the northern part of the Nottinghamshire
coalfield.
During the period, coal mined came from the High
Main Seam (05:050)* and the Vfaterlco Seam (O5:3c0)*
(iii)'Quarterly output:
Period
High Main
Sea::
April- June 19? 2
166 875
July-Sept. 1972
136 147
'.later loo
Seam
M
10 066
Development
all seams
3 475
2 465
Total
170 350
148 673
(Ann. Hoi)
40 419
33 256
2 465
Jan. -March 1Q73
137 048
153 052
2 031
179 932
188 339
Total
593 122
83 741
10 436
687 299
Oct. -Dec. 1972
* Seam Correlation Code
2.
(iv) Paces:
2.2
Nine faces were worked in the Eigh Main Seam. Two of
these faces were retreating and the rest advancing.
Average thickness of in-seam dirt band was 16cm. One
face (advancing) was worked in the Waterloo Seam .
This is the first production face in Waterloo Seam.
The seam has a dirt band which thins out in a southerly
direction, tfhen the face was first started the thickness
of the dirt band was ^\ cm.
Ventilation and dust suppression
Average air quantities, temperatures and relative humidities are
shown in Tables1_lO. These measurements were obtained from the
colliery records,
2.2.1
Dust suppression Dust suppression measures were applied on
faces, development headings and mineral transport systems, .
Special features noted were impingement curtains across
faces and Hicrodyne dust collector in tailgate of V l ' s face,.
2.2.2
Dust respirators llartindale Type «U' Respirators were in use.
It is estimated that 22 per cent.of the men employed underground
took respirators with them and 14 per cent of the men employed
underground actually used respirators. Respirators were used
by men during periods of high dustiness,
2.3
Manpower and occupational groups
.
.
The total colliery population at the end of .the dust year was 1231
of whom 420 were classed as faceworkers, 533 as non-faceworkers underground and .223 as surface workers. The number of occupational groups
at the end of the dust year was as follows;-.
31
Pace groups
Elsewhere underground groups 13
Surface groups
2
SAI-PLING AND EVALUATION
3,
3.1
Sampling programme
Sampling was carried out mainly by volunteer instrument carriers
(Sinha & Thomas, 19?2). The 'random collier' technique was used for
occupational groups for which it was not practicable to have volunteers.
The allocation of sampling effort is summarised in Table 11.
TABLE 11
Allocation of Sampling Effort
^"""--^^^ Environment
Samp 1 ing'"-— ^.^^
v.ethod
— \.
pace
Volunteer Carrier
356
Random Collier
Total
Elsewhere
Underground
2
478
18
358
496
Surface
M
29
29
;
To find out if there was any bias between 'Random Collier1 and
'Volunteer' sampling an exercise was carried out with one elsewhere
underground occupational group.
Twenty shifts were sampled by
volunteers of the group.
These shifts were also sampled by
investigators using the 'random collier1 technique.
Results showed
that the bias was negligable.
Samples could not be taken for seven groups listed in section^.6, as
the faces concerned either closed very early or opened very late in the
dust year and volunteer instrument carriers were not available.
Volunteer carriers carried sampling instruments at approximately fortnightly intervals.
All sampling shifts were supervised.
3.2
Sampling method and evaluation
The sampling method and evaluation of samples, including determination
of composition, were as described previously (Harrison, 1971; Sinha,
.1972).
Compositional analysis of the respirable dust was carried out at the
Institute of Occupational Medicine: and consisted of the determination
for each occupational group of the ash, quartz, kaolin, mica, calcium
and magnesium carbonate and iron carbonate contents of samples.
Similar compositional analysis was made of the non-respirable
(elutriator) dust for four occupational groups.
Difficulties were experienced in centrifuging down the very fine
particulate matter present in respirable dusts.
Ottery ar..!
Whittaker,
(1973) have reported a further examination of this
material which indicated that it consists mainly of carbon black
with some oily content.
It probably arises as contamination from
diesel exhausts and, possibly, from atmospheric pollution, from the
surface.
The contamination v.-as spread fairly generally throughout
the colliery.
4.
4.1
RESULTS AND DISCUSSION
Faceworkers
Tables 1-10 show the mean concentrations of respirable dust for the
face occupational groups in each quarter of the-year.
Mean ash and
quartz concentrations are also given.
Detailed comment on the face
results are shown as footnotes to these tables.
Variation of results
and high quartz concentrations may be noted.
4.2
Non-faceworkers
4.2.1.
Development Workers
Thirty-five samples v/ere obtained in coal
and twenty-eight in stone headings.
See Table 14.
The stone headings
samples include eight samples taken in
face advanced headings which
v/ere more than nine metres in-advance of the faces (Tables 7 and 8).
4.2.2.
Slsev.-here underground workers
Mean concentrations are given
in Table 12 for all 12 groups in this category ('E' codes): they range
from 0.8 to 2.9 mg/np.
TABLE 1
FACE SUMMARY
Seam
Corr.
Code
Scam
i
High Main
N.C.O.
Ccwl ftar.k %
Codu
Carbon
. .
05:050
802
-
Face
Starting
Data
._
81.3
April 1968
• ' •
Site
,
Fsce
Finishing
Dato
~
.,,
i
' *— •• • '
Loadergate
Height
243 a
1.17 D
• - — -— .
Intake Stable
Fired, handfilled
Kethod of Working
Rip and half heading fired and power
loaded
ha chine Details
Electric drill
uust suppression
49k» stage loader, 90k» panzer
(Hausher levelling i dinting machine)
Gel anpoules sprays at transfer points
Supports
4.25 x 3.05 Q arches
HyJrauhc props and Groetchel bars
Occupation
.
Gel ampoules
1
3
Front Rippers
Stableaen
F341
F344
6
8
Site
(Filling Shifts)
O.G.S.N.
• Number of Men, in Occupational Group
i
Mean RcspinLle
1st Quarter
3.5 (12)
4.9 (9)
j
Duvt
2nd Quarter
4.9 (5)
6.4 (10)
I
Concentration
3rd
5.3 (6)
'far Option
i
,
1
°-u3rter
mg/tn*
U(23)
5.7 (27)
4.3 (23)
5.7(27)
1.42*
1.75-
2.46
0.31
3.47
0.48
Year
for Site
• Aoh Concentration
mfc/m*
mg/m*
•
Quartz Concentration
5.8 (8)
'
-
««« Quarter
Mean Sample Concentration
1
lenrth
, ,, .
longmll
advancing
Half heading systea.
i
c.
J
binglo !lni+
Dec 1972
•—
Type of Face
mg/m*
1
i Site
1 Occupation
Face Tradesmen
Front Rippers
(Preparation Shifts)
O.G.S.N.
; Number of Mtn In Occupitional Group
I Mean Rcspirable Dust Concentration
• for Occupation
F330
F341
2
3
1.8 (2)
3.8 (2)
mg/m*
': l-ixinn Sarnplo Concentration
2.80 (4)
for Site
! Ash Concentration
Q0?.rtz Concentration
rog/m*
1.31*
mg/m'
1.71
0.27
mj/m*
Notes:
1.
..
2.
•
3.
4.
( ) Number of Samples
...
CHART
Shift Cycle .
—.
Filling
Filling
Preparation
Average
Output
per Shift
246
ton
Roof
Seam
•
Grey shale
and. shaley
oudstons
1.12 m coal
' 0.05 n dirt band
Face
Pov.er Loaded
Sprays on trepanner
GuLlick five-leg chocks
Machine Operators
& Froppers
F343
QuinVit/
7.80 m3/s -
Rip fired, handfilled £ packed
48 KB Chain conveyor
90 kvr Panzer
Gel ampoule
Gel atipoules
i
3.65 n-x 2.74 o Arches
5
7
Stablemen
F345
REMARKS
Tai Igate
Electric drill
Hydraulic props and
Groetchel bars
Dry 20.0
Wet 18.3
R.M. .86$
Front Rippers
.
:• F342.
8
i
Control
•
Point
19
8
4.2(7}
6.9 (5)
4.5(9)
5.1 (4)
5.6 (10)
-4.7 (6)
3.9(4)
5.9 (2)
5.7 (12)
-6.3 (6)
3.6 (2)
5.0 (5)
-
Face
Mo.in
6
"
- -
5.3 '(29)
5.9 (17)
5.3 (29)
3.43 -
5.9 (17)
2.00
2.57
0.30
2.80
0.33
4.2 (15)
•
.
5
5.2+
4.2 (15)
1.19
5.2 (11)
1.41
2.14
0.27
2.16
0.27
i
7
General Workers
Notes:
Average
Ventilation
Return Stable
4
•.
Floor
• •
Siltyaudstone
and seat earth
•Fired, handfilled
Double ended conveyor mounted
Trepanner (2 x 45 kw cotors)
•
3's
FACE
—.
—
— -i
Temperature
C
Front Rippers
E53
F342
1
.3
0.46 (1)
2.0 (5)
0.46 (1)
2.05
-
0.48
0.28
0.04
1.01
-0.13
Face
Ke-zn
2.3+
i
i
5.
6.
7.
e.
• Standard Deviation
Mof.-v/elghtcd Mean
TABLE 1
TA13LC 2
FACE SUMMARY
Seam
Corr.
Code
Seam
N.C.B.
Conl Rank
Codu
Face
Starting
Date
%
Carbon
v
High Main
05:050
602
81.3
Site
July 1970
Loadergate
Fere
Finishing
Dato
—
... _
July 1^72
TypcofFaco
'
sir.glp Unit
Longrall
advancing
Intake Advance Heading
Lenpth
r
He!'-ht
281 nt
1.18s
Intake Stable
Method of .Working
Withdrawing and re-setting
arches, packing
Full height -advanced heading
Fired and power loaded.
Fired, handfilled
Machine Details
90 ki» panzer
12 BU Loader
Electric drill
Dust suppression
Forcing Fan, Gel ampoules
sprays on loader
Gel ampoules
Supports
A. 25m x 3.05fli arches
2
1
Site
Stablemen
Occupation
Advance Headers
Hydraulic props and bars
. . 3
Stablemen
(Filling Shifts)
O.G.S.N.
F368
F367
F368
1
7
7
Number of Men In Occupation;! Group
Me?.n Rcspirable
1 st Quarter
3.2 (6)
Dust
2nd Quieter
3.2(1)
Concentration
3rd Quarter
for Occupation
mg/m°
3.0 (4)
_
2.6(1)
»
-
4th Quarter
Year
t-iean Sample Coni/jrstnjtlon
for Site
Ash Concentration
mr./m°
mg/m'
nv,/m8
3.2 (7)
3.Q (A)
2.8 (1)
3.2 (7)
1.97'
3.0 (A)
2.8 (1)
1.78
0.22
1.51
0.20
0.80
1.53
0.19
•
2
Siu-
Front Rippers
Occupation
F367
O.G.S.N.
3
Number of Mtn .'n Occupational Group
Mean Rcspirable Oust Concentration
3.0 (2)
8
for Occupation
mp,/m
3.0 (2)
1.33*
iVSita .
rrivjm*
Ash Concentration
mg/m8
Quartt Concentration
mC,m>
•
1.51
0.20
Notes:
1.
Loader gate advance heading touched fault in May '72
2.
Maximum concentration for occupational group F369 was 16.9 mg/ra
3.
High quartz concentrations
3
4.
.
on face and at return end.
The face mean ash at 71.1 per cent and the mean quartz at 21.7 per cent are the highest values recorded in
( )
Number of Samples
16's
CHART
~
Shift Cycle
:
Average
Output
Filling
Filling
Preparation
per Shift
111
ton
Roof
Seam
Floor
;— ;
Grey shale
and shaley
ciudstone
0.92n coal
0.2Cni
• di riband
Face
Si Uy nudstone
and
seatearth
Return Stable
Averages
Ventilction
Tcmpcrnturc
Quantity
>
4.77 m /s
Dry 19.9
Wet 18.2
R.H.. 86$
Tai Igate
Power loaded
Fired, handfilled
Rip fired, handfilled and packed
Double Ended Conveyor Mounted Trepanner
(2 x 45 kv/ motors)
Electric drill
48kw Panzer, 90k» panzer
Sprays on trepanner
Gel ampoules
Gel ampoules
Gullick Oobson powered supports
Hydraulic props and
Groetchel bars
3.65n x 2.740 arches.
4
15
6.4(15)
r
7
Stablecien
.
Front Rippers
8
i
Control
•
F369
F370
8
7
8.7 (10)
7.8 (4)
8.6(3)
10.8(1)
.
11.3(1)
3.5 (2)
- ...
c
REMARKS
•.
5
Machine Operator's
and Proppers
'
F366
FACE
Point
Fata
Mean
•
6.0(17)
• •
8.9(11)
8.4 (5)
6.0 U7)
4.08
8.9 (11)
5.15
8.4 (5)
2.03
8.6(3)
4.89
4.66
1.45
7.29
2.83
6.49
2.33
6.91
2.65
4
5.9+
7
Machine Operators
and Proppers
F366
Front Rippers
F370
U
0.8i
Faca
Ms;n
3
(1)
2.0 (1)
o.« (i)
2.0(1)
0.59
0.18
1.56
0.56
Notes:
2.3+
i
this seam and higher than those reported in 1971. (i.e. 70.8 and 18.6 cer cent rescectivelv).
0
Standard Deviation
Man-weighted MC.VI
TAOLE
2
TABLE
3
FACE SUMMARY
Seam
Corr.
Code
Seam
High Kain
N.C.D.
Co-il Rar,k
Codu
05:050
%
Carbon
602
81.3
Faco
Starting
Dato
Face
Finishing
Oato
Type of Face
Single Unit
Long-wU
advancing
Oct 1971
Len.-th
Height
185 a
1.1 7a
Site
Loadergate
Kethod of Horking
Intake Stable
Half heading system. Half heading and half
rip fired and power loaded.
Fired and handfilled
40kv? stage loader 90k» Panzer.
Eicico 621 loader
Electric drill
Dust suppression
Forcing fan
Gel sterling
Supports
4.25ra x 3.05a arches
hydraulic props and groetchslbars.
Machine
Details
.
Site
1
Occupation
(Filling Shifts)
O.G.S.N.
Number of Hsn In Occupational Group
1 st Quarter
Mean Respirabia
(
Dust,
2nd Quarter
Concentration
3rd Quarter
for Occupation
mg/m*
3
Front Rippers
Stablemen
F376
F379
6
6
3.3(1)
'
6.3 (?)
I
4.3 (3)
5.5 (7)
5.U11)
A
1th Quarter
2.6 (2)
6.2 (6)
Year
3.M6)
5.8 (29)
3.6 (6)
5.8 (29)
2.40
Mean Somplo Concentration
for Sito
Ash Concentration
mfjm»
mg/m*
Quartt Concentration
mg/m»
2.07*
1.91
0.23
'
'
- .
3.47
0.46
Site
Stablemen
Occupation
(Prepai-atlon Shifts)
F379
O.G.S.N.-
3
I Number of Mc-n In Occupational Group
7.0 (1)
Mean Rcspirable Dust Concentration
for Occupa'tion ''•
mg/m*
i ' I'iean Sample Concentration •
I
f
fcrSita
'
Ash Concentration
t Quartz Concentration
:
7.0(1)
mg/m"
-
mg/ms
mg/m*
Notes:
1.
2.
3.
I
i.1
*
~
—
4.15
0.55
CHART
18's.
Shift Cyclo
Averajjo
Output
Roof
'
''
Filling
Filling
Preparation
•
193
ton
Scam
Floor
•
—
Grey shale
and shaley
nudstons
Face
0.97 n coal
0.30 ui
dirt band
Silty mudstone
and seatearth
Power Loaded
>ouble Endsd Conveyor Mounted
Trepanner (2 x 45 kiv motors)
Dr
;'
'•
r
20.9
19.0
84?>
X
Wet
R.H..
;
i
i
Fired, handfilled .
Rip, fired and power loaded
f
Electric drill
48kw stage loader 90kw panser
12 [JU Loader
j
Gullick 5-leg chocks
Hydraulic props and
Groetchel bars
4.25a x 3.05m arches.
7
5
Machine Operators
& Prcopers
F378
8
Stableoen
Front Rippers
F380
F377
i
i
Control
Point
Face
6
6
14
!
i
i
i
|
4
I
i
|
4.9 (17)
5.4 (?)
7.2(1)
3.9 (3)
5.3 (12)
8.0 (6)
5.5 (5)
4.8 (i,)
7.0 (15)
8.0 (10)
5.6 (8)
6.5 (3)
i
1
7.7(6)
3.8 (3)
i
3.6(1)
6.3(11)
3.6 (1)
5.8 (55)
2.22*
10.7 (8)
8.6 (26)
6.3 (20)
5.8(56)
t-. 22
8.6 (26)
3.82
6.3 (20)
2.18
5.9 (13)
2.41
3.56
0.42
5.56
0.71
4.05
0.46
4.20
0.51
-
C
REMARKS
Sprays on loaders
4
Qtjantlty
Tailgate
Gel stenming
'F330
Temperature
•
Sprays on trcpanner
Face Tradesmen
Average
Ventilation
4.12 r7s
Return Stable
FACE
•
•
6C0+
'
i
;
j
7
i
Face Tradesmen
Front Rippers
t
F330
r
F377
3
2 .
2.4(2)-
2.7(12)
,
Fcco
l-'ean
'
;
•
i
4.3+
\
2.7 (14)
0.85*
i
i
i
i
i
1.73
0.22
Notes:
i
S.
6.
•
7.
e.
1
Standard Deviation
Man-weighted Mean
TABLE 3
TAOLE '•
FACE SUMMARY
Seam
Seam
Corr.
Code
.
HichHair,
••
N.C.O.
Coal Rank
Code
05:050.
802
%
Carbon
-
Face
Stirling
Date
Face
Finishing
Data
81.3
July 1969
May 1972
.
Site
Type of Face
Single Unit
•longirall
retreating
Method of Working
Road c'ra»n off as face retreats.
Arch legs drawn and reset.
Ma chine details
43k',T stage loader 90 ks panzer
Electric drill
4.25s x 3.05.T1 arches
i Site
Occupation
(Filling Shifts)
O.G.S.N.
Number of Men in Occupalionr.1 Group
!
Mec.n Rcspinbla
1
1st Quarter
2nd Quarter
Dy!>t
Concentration
3rd Quirter
, _
.
for Occupation
1th Quarter
mg/m*
Year
j Mean Sample Concentration
for Site
mpjm*
Ash Concentration
(ng/m"
mg/m*
.
.
Site
i Occupation
j O.G.S.N.
Number of Men In Occupations! Group .
for Occupation
•
mg/m*
I'iean Sample Concentration
| for Sito .
tfifjm*
I Ash Conccntr.-.tion
mg/me
j Quartz Concentration
mg/m*
Notes:
1.
2.
>
3.
( )
Number of Samples
Height
1.27a
Gel ampoules
Sprays at transfer points
Supports
278m
Intake Stable
Loader gate
• Dust supression
Length
CKAfXT
21 is
Shift Cyclo
AIi-crago
Roof
Filling
(one shift .
a day)
P0 r * lft
"
1 38 ton
r
v i and
A
Grev
shale
"
Seam
Floor
Average
Ventilation
Quantity
si Ity tiiudstone
and seat earth
1.06a coal
3.97 n3/s
dirt band
nudstone
FACE
Temperature
—
Dry
18.2
Wet '16.3
R.H.. 83^
C
i
REMARKS
Return Stable
Face
Stoppings erected as face retreats
Fired and handfi lied
Power loaded
Double ended conveyor
Counted Trepanner (2 x 45k« motors)
Electric drill
90k« panzer
Sprays on Trepanner
Gel stemming
Gel ampoules
Gullick Meg chocks
4.25m x 3.05ra arches
Snickets fired
and nandfi-lleo •
8
4
Machine Operators
and Froppers
F349
>
F ace Officials
f
Control
Point
E50
Faco
!i,ean
2
7
i
Tailgate
|
3.8 (A)
2.1 (2)
..
•
•
3.8 (4)
2.1 (2)
3.2
0.48«
3.2 (6)
1.13*
-
1.75
0.19
4
General Workers
•
E53
Face
2.2 (1)
i
'•
u-
2.2 (1)
i
Notes:
S.
6.
7.
0.
0
Standard Deviation
-(- Man-weighted Mean
TAOLE
TABLE 5
FACE SUMMARY
!
Snam
Seem
Core.
Cede
'
Hi &h Main
.
N.C.O.
Co.^1 Ry.k
Coclj
05:050
Face
Startin;?
Date
%
Carbon
802
81.3
Fcco
finishing
Data
April 1972
Type of Face
Lenglh
Height
j
Single Unit
longwall
advancing
222 to
1.19 n
Site
Loadergate
Method of Working
Rip fired and power loaded. Half heading
system adopted since August 1972.
Intake Stable
Fired arid handfi lied
Machine Details
40kw stage Loader 90kw panzer 1C 3 loader
Electric drill
Dust suppression
sprays on loader and transfer points
Gel ampoules
Gel steraaing
Supports
3.65a x 2.74:a arches
Hydraulic props and Groetchel bars.
••
1
Site
Front Rippers
Occupation
Face Officials
'
3
-Stableraen
(Filling Shifts)
F381
O.G.S.N.
12
Number of Men in Occupational Group
Mean Rcspirable\
2nd Quirtcr
9
U(8)
'3.1 (6)
3.6 (1)
3.7 (3)
5.2 (9)
- 5.2 (6)
Concentration
3rd
, ~
,
f o r Occupation
4th Quarter
.......
2.8 (2)
2.8(1)
4.4 (14)
Year
3.5 (16)
1.U*
3.2 (2)
0.55
5.2 (17)
ir>g/T>V
°-vnrter
F384
' 3
U (5)
>«* Quarter
Duit
E50
Mean S'.implo Concentration.
for Site
Ach Concentration
ropjm*
mg/m*
Quartz Conccntntion
mpjm*
\Sitc
\
:^
- -
- '-
3.4 (18)
1.08*
5. 2 -(37) .
1.96
2.03
0.20
3.09
0.32
. .
Occupation
O.G.S.N.
Num'jor of Mtn 'n Occupational Group
1'lcan Rcspircble Oust Concentration
for Occupation
mg/m*
. t-'nian Sample Concentration
•'
for Si to
rrtg/m*
Ash Concentration
rng/m°
mj/m*
Notes:
I.
2.
3.
4.
( )
Number of Samples
,
CHART
25 's
Shift Cyclo
_~_.______— .
Filling
filling
filling
Avcraro
Output
per Shift
?11
'
-- •-
Roof
Scam
— . ..
...
.
1.1': rc coal
0.05m
dirtband
...
,,
• .
trey shale
and shaley
Eiiidstone
ton
Return Stable
Poser loaded
Fired and handfi.lled
(2 x 45 kw motors) trtpanner
.
Electric drill
Ircpingeirent curtain tried out v
Sprays on trepanner
•
Dobson Chocks
Gel ampoules
Quantl£y
..
.
Face Tradesmen
F330
.
-" " ~
' G e l ainpoules sprays on loader
4.8(1)
!
-.
j
|
3.65n x 2.74ra arches.
7
Front Rippers
10
11
1
6.4 (6)
5.0(9)
3.8(1)
3
4.5(1)
6.9 (2)
8.6 (5)
5.0(8)
7.3(2)
6.9 (3)
6.6 (8)
' 4.7(9)
4.1 (4)
7.1 (6)
4.1 (5)
5.1 (7)
2.10
6.8 (17)
5.9(27)
2.46'
4.9 (38)
•1.48
2.73
0.31
.
Central Workers
E53
4.6(5)
4.9 (29)
1.39: .
8
F382
F3S5
5.1 (7)
j
90kw panzer 4fikr,' stage loadsr
EII-'CO side dmp loader
'
E50
- I
i
.
Face Officials StabUinen
21
6
REMARKS
Fired power loaded
5
' Machine Operators
and i'^oppers
F383
1
{
DO' 20.6
Wet 18.7
R.H.. 84£
,
5.73 nrYs
Tailgste
Hydraulic props and Groetchel
bars
4
4.7 (2)
0.10'
siUyr-udstone
and seat earth
Temperature - c '
.
4.7(1)
Averap.o
Ventilation
'
Face
'
Floor
.
FACE
Control
Point
Face
[•** n
8.3 (2)
4.2 (2)
• 5.8
5.9 (28)
2.44 «
3.58
0.36
3.32
0.30
(3)
3.5 (3)
'
3.8(1)
6.8 (17)
2.39
4
"
•
i
5.0+
5.3 (10)
2.54
2.90
0.32
i
t
j
1
Generz . Workers
E53
i
1
Face
Kean
1
i
1.3 (1)
5.3(1}
1.3+
0.78
0.10
' Notes:
5
6.
7.
e.
0
Standard Deviation
Man-weighted Mean
TABLE 5
TABLE
6
FACE SUMMARY
"" • "
Scam
Corr.
Code
Scam
High Main
N.C.O.
Cor.! Rank
Codo
05:050
802
i
i
*
Face
Stating
Date
%
Caroon
81.3
.
torch
Typo of Fac/j
Fico
• Finishing
Date
1S73
j
I
Single Unit
lonp-Aall
retreating
Length
265s
Height
1.23s
.
Site
Losdercate
Method of Working
Road drswn off as face retreats. At
face end arch legs withdraw and reset.
fe chine Details '
50l:» panzer 48 kn st;ge loader
Dust suppression
Supports
Intake Stable
Fired, . hindfilled
Electric drill
Sprays at transfer points
Gel steirjriing
4.25n x 3.05n arches .
Ears and hydraulic props.
Site
Occupation
(Filling Shifts)
O.G.S.N.
: Number of Men In Occupation;! Group
i
1st Quarter
Mean Rcspirabie
Du>t
ind Quarter
Concentration
3rd Quarter
1th Quarter
for Occupation
• .
mg/m*
.
. Year
i Moon S:irnple Concentration
for Site
1 A;h Concentration
ms/m*
• Quirti Concentration
mg/m*
•
mc/m*
Site
Occupation
*
O.G.S.N.
Number of Men In Occupations! Group
for Occupation
mg/m*
for Site
i A-,}| Concentration
mg/m*
i Quartz Concentration
mg m*
Notes:
'
'mg/m'
J.
1
Face started towards the end of the dust year and all occupational groups could not be sampled.
2.
3.
4.
( )
Number of Samples
CHART
29's
Shift Cyclo
r-nFT 1 lino
(one shift
a day)
.
Aycrap.o
Output
per Shift
263
Roof
Seam
.
.,
...
Grey shale
and shaley
cudstone
ton
Face
Floor
^
1.08 coal
O.Zin
Dirtband
Si Ity DUC stone
and seatearth
Fired, handfilled
trepanner (2 x 45kw motor)
Electric drill 90kw panzer
Sprays on trcpanner
Gel ampoules
Dobson five leg chocks
7
!
Electric drill
Arches - 4.25n x 3.05ra
.•
8
Stablemen
.
PsEMARKS
Stopoing erected as face retreats
snickets fired and hand shovelled.
5
Machine Operators
• and Proppers
•
F403
,
Dry 18.7
Wet 16.7
R.H.. 832
Gel ampoules
Bars and hydraulic props
4
'
Tai Igate
:
FACE
Temperature . C
5.46 m /s
Return Stable
Power loaded
Avcra?o
. Ventilation
Quantity
'
F404
Control
Point
Face
3
!..
4.4 (1)
15.9 (I)
4.4 (1)
15.9 (1)
4.4(1)
15.9 (1)
2.62
0.27
10.06
1.24
.7.9+
Faco
f'.;an
I
Notes:
S.
6.
•
7.
0.
0
Standsrd Deviation
-{- Han-weighted Mean
TADLG
6
.
TABLE 7
FACE SUMMARY
Scam
Scam
Corr.
Code
• •
High Main
N.C.D.
Co:i! K-snk
Code
05:050
Face
Stnrtin:'
D?.t2
% •
Carbon
802
£13
Site
fcrch
FSCQ
Finishing
Date
,
.,,-,-,-
Type of Fate
—
_. , ....
Sir,cle U m t
Lcn-^tli
""
Hc'c-ht
Oct 1972
Icncwall
advancing
288 is
1 31 m
1570
LoadErcate
Intake Advance Heading
Method of working
Kithdra»ing and resetting arches
Full height advance heading.
and power loaded
Machine detsi Is
48kv? stage loader 90ka panzer
12BU loader
1
1
Dust suppression
Forcing fan, sprays on loader
Supports
4.25m x 3.05n arches.
i
1
Site
2
i
Occupation
Stablemen
(Filling Shifts)
F361
O.G.S.N.
i
.,,
\ Number of Msn in Occupational Group
Mean Rcspirsbte
1st Quarter
Duvt'
IndQurj-tcr
Concentration
3rd Quarter
for Occupation
•• - , v mg/rn".
—
10
3.4 (7)
[
(see Note 2)
3.3 (4)
4.9(1)
1th Quarter
4.6 (8)
3.5 (12)
1.05*
Year
Mean Somplo Concentration
for Sito
Ash Concentration
m.r/m'
rng/m*
Qusrtz Concentration
mg/m»
3.5 (u)
1 05*
1.89
0.18
Site
Occupation
(Preperation Sh!fU)
O.G.S.N.
j N'jtnter of Men in Occupational Group
t
Mean ftcspirable Dust Concentration
mB/rnf
for Occupation
Moan Scrnplo Concentration
for Site
mFj/m«
Ash Concentration
meym*
j Qyaru Concentration
mg/m'
j-
' Nota-;:
\.
2.
•'
Wet dust collector was used in Tailgate for a short period.
Intake advanced hoadir.fi sampled as a seperate working place, a stone drivage, as it was ifiore than
9 oic-tros in advance of the ficc-line and had more than 5Q£ of rock in its cross-section.
Quartz concentration 0,13 sci/V •
{ ) Number of Samples
Fired
CHART
31 's
Shift Cyclo
. '
filling
filling <
filling
'
.
. . Av GmjQ
.Roof . •
jtput -. ... —r—- — — — ——
:
.. pci* Sh'ft '
""~r^0y' chain
'
••»(•
.
and
shaley
.
tf
n
ab
°"
rcudstone
.Scam
•
fired and handfilled
Pov,er Loaded
Double endad conveyor.
Hountcd (2x45kw motors)
trcpanner
Floor
i .1
1 .Ota coa 1 .'
°/^
,
d
'rtband
•
Return Stable'-"- • •'•-••
face
.
-.-
Average
VcntiSetlon
Quantity
.
si Ity mudstone
seatear{h
:
.Temperature
C <
21.4
19.6
j
i
Dry
Wet
and
'5.09n.3/s
FACE
•R.H.. 64£
|.
REMARKS
Tailgate
i
i
Rip fired, handfilled and packed
48kvr stage loader
|:
ii
ij
!'
90kn panzer
Electric drill
T
Sprays on trepanner
Gel ampoules
Gel ampoules
Dobson five-leg chocks
Hydraulic props and
Groetchel bars
4.25 x 3.05a arches
t •
I
•
I-
'
!
•
4
fsce Tradesmen
' F330
. . 5
Machine Operators
and Propoers
f360
20
5.0 (6)
7
5
13.0(1)
••
•
8
i
•
Rippers "
i
Point
Face
l-;ean
10
12.3 (3)
.
11.7 (2)
U (5)..
6.4 (3)
5.8 (2)
11.4(2)
•
•
r J
Control
F364
10
.
5.4 (11)
.8.9(3)
Stableir.en
(oachine got )
f362
!
•
|
J
!
i
.....I.
i
i
t
•»
i
f
6.1 (12)
4.34 .
6.3 (9)
2.79*
6.2 (21)
3.67
3.93
0.61
12.1 (5)
8.4(7)
12.1(5)
0.93
4.06
8.4(5)
4.76
5.71
0.84
5.72
0.83
8.4(7)
8.45
0.90
1
i
i
1
!
face Tradetnen
t
Rippers
F330
F364
2
2
2.2 (1)
i
1
Hean i
t
1.8(2)
t
2.0+
;
1.8 (2)
0.45
2.2 (1)
j
'
|
i
i
1.55
0.33
1.25.
0.18
i
]
Notes:
3. High quartz concentrations at the return end.
'
;
•
'
j
!
• i
,•
Standard Deviation
4- Man-weighted Mean
TABLE 7
TABLE C
FACE SUMMARY
i
Seam
Corr.
Cede
Seem
- '
N.C.O.
Co.il Rank
Code
Face
Starring
Date
%
Carbon
'
Faco
finishing
Cato
"~
'
High Main
05:050
602
81.3
liov. 1972
Typcofraca
.
. ' ., •
c.
Simle unit
Icngvrall
advancing
.
Lensth
Heltjiit
"~
1,83 a
I.Ooe
• 3it"
Loadergate
Intake Stable
Method of Working
Half heading system. Fired and powerloaded.
Machine details
ASkw stage leader
HC3 .(38k«) Loader
i
Oust suppression
Fired, handfilled
90k» panzer
Electric drill
Gel ampoules. Sprays on loader and
transfer points
j
Supports
4.25m x 3.05a arches.
Gel aopoules
*
Hydraulic props and bars.
1
Sito
Occupation
Face Tradesmen
3
Front Rippers
Stablemen
(Filling Shifts)
O.G.S.N.
F350
F396
F397
2
6
9
" Number of Ken In. Occupational Group
, - - - - ljt
Me?.n Kcspirable
Dmt
Quarter
2nd Quarter
jrd Quirtcr
Concentration
,
~.
,
for Occupy' Ion
,
mg/m*
J
.
3.6(1)
'
1th Quarter
, ,
. 3.6 (1)
Year
for Site
mrJtn*
Ash Concentration
mg/m'
mjj/m*
Site
4.5 (2)
6.2 (8)
4.5 (2)
6.2. (8)
4.2 (3)
0.91*
«.?. (8)
2.82
2.59
0.43
3.59
0.51
.
1
Front Rippers
Occupation
F396
O.G.S.N,
2
Number of Men In Occupational Group
Mean Kcspirable Dust Concentration
for Occupation
•
for Sito
.
"3.6(4)
,
mg/m*
•
mg/m*
Ash Ccncentr.-.tion
'
mg/m*
3.6 (4)
1.33*
•
2.15
.30
mg/m8
Quart?. Concentration
Notes:
From February 1973 full height advance heading ivas made In Tailgate which was ventilated by an
auxilidry fan. Stablemen sere ecployed on face end preparation work (Site 7).
( )
Number of Samples
•-
.
CHART
FACE
Shift Cyclo
Aycr?£o •
. Output .'
• per Shift
Filling
filling
preparation
118 ton
Roof
.
Seam
• •'
—- '
Grey shale
and shaley
audstone
Face
'
Floor
i
-
1.21 ca coal
ho dirtband
'
Power loaded
Sprays on Trepanner. Impingement curtain used occasionally
Gullick 5-leg chocks
Face Tradescen
F330
REMARKS
j
Gel ampoules
4.25m :• 3.03ci arches
5-
1
Stableflen
.
Face Tradesar.n
8
7
Stablenen
F399
F330
F399
5
1
1 .
14
Front Rippers
F400
4.3 (1)
' 5.0 (9)
6.7. (2)
4.3 (1)
-
5.0(9)'
2.66 .
6.7 (2)
4. > (10)
2.52
.
3.19
0.46
.. 4
5.8 (1)
1.MD
E53
•
4.47
0.49
F399
fj.TiCO
8.3 (3)
5.8(1)
.
6.7 (2)
1.99
Stablenen
Point
2.3(1)
. 5
General Workers
Control
6 •
1.8(1)
c
Dry 19.6
Wet 18.4
R.H. 91$
KC3 (38kvy) loader 38kv; panzer
90 kw panzer
Machine Operators
and'Proppers
F398
c.
Rip fired and power loaded
Gel ampoules
I\
7
2.81 n /s.
Temperature
Tailgate
Fired, handfilled until February. 1973
see Note 1.
Electric Drill
'
•
Double ended conveyor
mounted Trepanner (2 x 45kn
Eolors).
tian
. .Silty cwdstone
and seatearth
Return Stable
Average,
Ventilation
i
2-3(1)
5.0+
3.3 (3)
2.19
8.3 (3)
5.65
2.21
0.29
5.85
0.69
7
. Stablemen
Front Rippers
F399
F400
Faco
M'-JD
.. 1
2
2.6 (1)
2.2 (1)
2
4
2.7 (1)
1.1 (2)
2.2+
2.6 (1)
-
2.2 (1)
-
1.7 (3)
0.9.'.
i
1.54
0.20
1.42
0.16
.
1.09 0.13
Notes:
.2.
3.
The return advanced heading (Site 6) had a nean rospirable dust concentration of 5.8 cg/o .
Ash and quartz concentration high along this face.
!
e
Standard Deviation
H- Man-v/eightcd Mean
TAOLE 8
TADL5 9
FACE SUMMARY
Scam
Corr.
Code
Scarn
High Main
N.C.O.
Coil Rank
Codij
05:050
Face
Stirling
Date
%
Carbon
802
81.3
j
Type cf FOO>
Lcnsrth
II
Single Unit
long-Mil
advancing
June 1972
III
225 B
Heipht
—
-^~*~T
T
Lcadergate
Intake Stable
Method of Working
Half heading system.
loaded
Kachine details
4l!kw stage loader 90kw panzer
I-1C3 (3ckw) loader
Electric drill •
Dust suppression
Gel ampoules
Gel st easing
Supports
4.25m x 3.05a arches
Hydraulic props and Qroetchel bars.
Fired, handfi lied
Fired and power-
1
Site
3
Stablemen
Front Rippers
. Occupation
(FillinC Shifts)
F386
O.G.S.N.
Mean Rcspirable
DlAt
Concentration
for Occupation
mg/m*
lrt
F389
5
I Number of Msn in Occupational Group
-
6
Quarter
2nd Quarter
5./, (4)
3rd <
3.2(11)
.
3.2(7)
3.6 (22)
'
5U3rter
.„ „
Year
9.9(1)
5.3 (6)
'
-
4.7 (10)
5.2 (17)
..
3/5 (22)
for Site
m?Jm*
1.8.':*
Ash Concentration
mg/m*
mg/m*
2.11
0.26
5.2(17)
2.35
3.01
o.38
;
1
Silr:
Front Rippers
Occupation
F3fi6
O.G.S.N.
3
Number of Mt:n in Occupational Group
2.7(5) .
s
for Occupation
mg/m
.
Mean Sornplo Concentration
for Sito
mp/rn»
Ash Concentration
mg/m*
mg/m*
. 2.7 (5)
•
0.75*
1.60
. 0.20
•
Notes:
1.
Fault touched in Tailgate in November 1972. Face length gradually decreased as Tailgate followed faultline.
2.
Sean contains local pockets of dirt in this panel.
3.
( )
Number of Samples
J_-T_
1.060
,
Site
!
Face
Finishing
Data
-
CHART
41 'S
Shift Cycla
Averago '
"
Roof
-Output- ••per Shift
.„_,
Grey shale and
T_
.Filling
filling
preparation
-107 .
Seam
:
shaley r,iudstono
ton
Face
.
1.Z2ra coal.
Silty ir,ndstone
0.05 m
dirtband
and seatearth
•
.
Return Stable
Fired, handfilled
Double -ended conveyor mounted
Trepanner ( 2 x '<5kw iriotors)
.
Electric drill
Sprays on trepanner
Gel ampoules
Gullick 5-lcg chocks
Hydraulic props and Groetchel
bars
'
'
90kw panzer
.
DO" 19.0
Wet 17.4
R.H..
86^
REMARKS
38kw panzer KC3 loader
Gel anpcules
.
3.65 x 2.74 arches.
5
:
Stablemen
13
5
C
•
Machine Operr-tors
and Proppers
F388
F330
3.79 n3/s.
Temperature
Fired, power loaded by MC3 loader.
In Nov.1V72 changed to EIMCO loader.
-
Face Tradesmen
Avenge,
Vontilf/cion
Quantity
Tailgate
Power loaded
4
Floor
— _—
FACE
7
Front Rippers
F390
F387
6
6
!
6
•
Control
Point
:
,,Fa«
hean
5.9 (2)
.
9.6(1}
5.4(9)
•
. 9 . 7( 9 )
9.6(1)
'
.9.0 (4)
6.0 (5)
8.9 (8).
6.5 (9)
7.0 (3)
0.2 (3)
4.0(11)
11.4(9)
8.2 (8)
6.2(31)
1.64
10.0 (21)
7.0 (22)
10.0 (21)
3.32
7.0 l#)
3.39
8.6 (6)
4.73
5.20
0.92
6.30
1.21
0 (32)
3.78
•
. 7.02
1.25
4.48
0.63
6.5+
7
Front Rippers
F387
3
..
3.3 (6)
.
=
Faco
Mrsn
3.0+
3.3 (6)
2.55
2.49
0.44
• ' . - : . • : •
Notes:
S.
6.
7.
e.
e
Standard Deviation
Man-weighted Mcsn
TADLE 9
;
10
FACE SUMMARY
i
i—
[
Seam
Scam
Corr.
Code
-
Waterloo
.
N.C.O.
Coil Rar.k
Code
05:360
.
°/p
Carbon
802
81.8
i Site
f
;
i
i
!
Face
Starting
Daiu
Type of Face
Fsco
Finishing
Data
August 1972
Loaderg?.te
I
Single Unit
Longwall
Advancing
l.»njrth
219 a
Rip fired and power loaded
Machine Details
3Ekw stage loader EIMCO 625 loader
SOktf panzer
Electric drill
Oust suppression
Debris sprayed.
Gel arcpoules. lEipingecent curtain
tried out
Gel arapoulcs
Support s
4.26n x 3.65m arches
1
Occupation
(rilling Shifts)
O.G.S.N.
! Number of Men In Occupational Group
!
Mean Rcspirsble '
3
Rippers
Stablemen
F391
F394
12
11
l$t Quarter
2nd
Dust
Qu^cr
5.UO
6.0(2)
Concentration
3rd Qulrter
6.2 (3)
5.9 (3)
torOcruj^ton
"th Quarter
3.9 (0
U (7)
Year
5.0 (8)
2.77*
5.1 (12)
1.92
5.0(8) •
2.77*
5.1 (12)
1.92
3.65
0.79
3.41
0.56
mg/m°
1.32m
Intake Siable
Method of Working
Site
Hc!--ht
] Mean Sample Concentration
for Sito
Ash Concentration
rnpjm*
mg/m*
rn?Jm*
'
Site
Occupation
O.G.S.N.
Number of Men In Occupations! Group
Moan Rcspirable Dust Concentration
for Occupation
wg/m*
for Sito
mg/m*
Ash Concentration
mg/m*
mg/m»
Notes;
1. Hicrodyne replaced by Dry Extractor in October 1972 but hardly used.
2. High quartzconcentrations occur even at the intake ripping 0.79 ag/n
3.
4.
|
CHART
VI 's
Shift Cycle
,
Fillina
filing
preparation
;
Average .
Output
per^hift
. . . . . .
203
Roof
Seam
Floor
.
..
ton
^
.
1.12m coal
O.Sln dirt band
nudstone
Face
Average
Ventilation
Quantity
—
3m silt stone
then sandstone
7.56
Return Stable
Tailgate
Power loaded
Powerloaded
Trepanner (2 x 48kn motors)
Planner and shearer - BJO 76kw
Dosco (38ki?) ripper. Bcceroit Plough
Packer 48kw panzer
90k?/ panzer
Sprays on trepanner and planner
Sprays on loader
Sprays on ripper. Hi crodyne
Dobson 5- leg chocks
Dobson 5- leg chocks
Ripping done by machine.
power packed.
Debris
FACE
Temperature
C i
21.6
19.0
7$
Dry
Wet
R.K,
•
•j
-I
j
REMARKS
i
Planner and
~!
shearer withdrawn
'
arch !7i? Handi
Hied after this. :
* f
Plough packer replaced by s lusher
n Sept. 72. Hand
:
\
:
4.26 x 3.65ra arches
i
4
Face Tradesmen
'
'
:
5 .
F330
Machine Operators
and Proppers
F393
3
21
Stablemen
7
Fa:e Tradesmen
F395
F330
8
1
i
8
Rippers
F392
Control
• i
Whoto j
Point
Faco
12
|
i
•
. 3.0(1)
'
.
11.2(9)
6.7(2)
9.8 (5)
7.1 (9)
8.9 (4)
7.3 (13)
8.7(10)
4.12*
3.4(31)
«• 4.28*
8.5(41)
4.19
.
7.9 (2)
5.1 (3)
11.6(2)
10.9 (3)
9.8 (19)
11.3(3)
14.5 (5)
14.2 (16) .
12.7 (4)
11.9 (10)
6.37
11.9(10)
6.37
6.38
1.37
11.3 (38)
5.62'
7.9 (2)
,
9.94
2.31
11.1 (40)
5.58
9.33
2.14
j
i
8.2+
9.79
2.28
F392
i
i
i
12.0 (9)
2.26
Control
Position
i
—i
|
I
7
Rippers
j
i
i
Mole
Faca
Mean
i
'
:
2.9+
j
1 .
2.9 (1)
-
2.9 (1)
3.8 (1)
2.46
0.57
3.08
0.72
Notes:
3.
0
High concentration? recorded, in Sites 5, 7 and 8 are associated with very high ash and quartz concentrations
Standard Deviation
Man-svelghted Mean
TADLE 10
4.2,3 jurfac_g workere Surface workers were divided into tvro occupational
groups, £4 'screens' and SO for 'surface others' (Table 2).
The concentrations
are similar to the values of 1971«
4.3
liMvironr'ien te.1 summary
Taole 14 (at the end of report) gives the mean respirable dust
concentrations for faces, elsewhere underground and surface.
The mean respirable dust concentration for coal-getting operations
was 6.0 mg/nP, compared with 5.8 nifi/nP during 1971 (Sinha & Annis,
1973).
•
Respirable dust concentrations for preparation work (2,7 m.<r/m3) f
outbye (2.2 mg/.TiJ) and surface (0.4 mg/rr.3) worked were similar
to previous results.
-•
The. percentage of ash and quarts in ash ir. the samples recorded in
Table 14 show that the mean per cent ash (TS.O/'-) and per cent
quartz in sample (16.9X0 for the "aterloo Seam vrere higher than those
of the High Main Seam (6~0.c<;', and 8.7/' respectively).
The mean quarts concentrations for the faces were high, 0.2o ing/m3 _
1.23 roc/ni3. The high values tend to be • at the return end and seem not to
depend particularly on the amount of dirt present in the seam, as shown below:-
Face
"Thickness of
Dirt •
.( m m )
44's
. Quartz Cone.
at Site 5
rng/ni3
Quartz Cone.
at Site 8
mg/m3
Pace, I.!aan
Quartz Cone.
E,aAa3
0
0.49
0.69
0.45
50
0.33
0.27
0.34
25's
50
0.36
0.32
0.29 •
41 's
50
1.25
1.21
0.66
16's
200
2.S3
2.65
1.25
18's
300
0.71
0.51
0.45
31's
500
0.90
O.S3
0.6o
3's
4,4
•
•
Relationship between control point arid face concentrations
The trean respirable dust concentrations obtained at the control point
(70 m from the face in the return road) for the various faces are
given in Tacles 1-10 and from Table 14 it can be seen that the ratio
of return road, concentration to face concentration for coal—getting
operations ranged from 0,94 to 1.61.
The mean value for the ratio for the colliery coal-getting operations,
i.e, tho ratio of the riiaan concentration of all camples taker, .at
the control point on the coal-getting shifts to the mean of all face
samples excluding preparation and development work, was 1.24.
The values for 1969, 1970 and 1971 were 1.2Q, 1.08 and 1.32 respectively.
The value used by Jacobsen, Rae & tfalton (1969) in the Interim
Standards' Study was 1 .4.
.
4. 5
Total d u s t measurements
The measurements of "total dust concentration 1 continued as before
(Sinha. 1 9 / 2 ) . Total lust concentrations were derived, from total
(elutriator and respirabie) weights of dust and. sample volumes5
153 samples were evaluated. The results obtained are shown in
Table 13.
On average, total dust concentrations are about 5.4 tinies as high
as respirabie concentrations. The ratio drops gradually along
the face from intake stable to the -control sampling point (70 ra
from face in the tailgate).
The analysis of the elutriator fractions showed that the quartz
contents were lo>rer, w i t h the exception of one occupational group,
than for the corresponding respirabie dust.
4.6
Ss timated^ concentrations
Estimated respirabie dust concentrations for the unsair.pled groups
where it was not possible to obtain volunteer carriers have been
made by comparison w i t h results from the previous surveys.
These
estimated mean concentrations are as follows:F350
F35'
F352
F353
p'401
P402
F405
4.7
Loadergate Stablemen, 2 1 ' s Face - 3.2 mg/m-.
Tailgate Stablemen, 2 1 ' s Face 9.0 'ing/ni3.
Loader-gate Prep.& Salvagemen, 2 i ' s Pace - 2.0 mg/m-'.
Tailgate Prep. & Salvagers en, 2 1 ' s Face _ 9,0 mg/m-^
Loadergate Prep. & Salvagem^n, 29's Face - 2.8 mg/m- 5 .
Loadergate Stablemen, 29's Face - 3.1- mg/m\
Tailgate Prep. &. 3alvagemen, 29's Face - 5 . 5
mg/ni .
Special invest.igatior-3
(1) Trials to ascertain suitability of P . V . C . filters for routine
sar/.pling of respirabie dust were carried out. It appeared that these
filters were d i f f i c u l t to '.uind.le. Further trials to explore this
problem were recommended.
(2) Trials to compare the whole shift exposure to nitrous fumes
of shotfircrs w i t h the corresponding exposure of facemen and development workers were carried out. Results have been reported by
Dodgson & Jones, (1972).
(3) Trials to assess the effectiveness of dust respirators in reducing
personal dust exposure if worn only during periods considered
to be dusty, were carried out. Further work using Tyndalloscope
is planned.
(4) A study of the use of dust respirators at the colliery was carried
out and the results will be included in a larger study (Bradley,
Sdlin i Jones, 1974).
H E F E H E U C E S
Bradley, A., Sdlin D.'/f, &. Jones, C .0. (1 974) Dust Respirator Usage at
P.P.R. Collieries. Ins ti tute _qf_ Occupational !• •'. ed'ici no . Report
Mo. TM/74/11
Dodgson, J. & Jones, C . O . (1972). Nitrous fume concentrations during
shotfiring in coalmines. Institute of Occupational Medicine
Report No. TM/72/2
Harrison, G.B. 0971). Analysis of gravimetric filters taken at
Linby Colliery 0970 - Parts I and II).
Institute of Occupational.
Medicine. File No. H? 31121.
Jacobsen, M. , Rae, 3. & '/falton, W . H , 0 9^9) • ^ e relationship between
dust and pneuincconiosis as a, basis of a gravimetric standard for
airborne dust underground. N . C . B , Report TTo. I SM/P ( 6 9 ) 1 1 .
Ottery, J. & ',/hittaker, ;•/. (1973). Further investigations on
respirable dust collected, at Linby Colliery - 1972.
Institute of
Occupa ti or;al Med ic ine , Pile No. PP 31 003.
Sinha, I-i.M. ( ' 9 7 2 ) . Pneuir.oconiosis Field Research; environmental
conditions at Linby Colliery 19^9. Institute of Cccupational
Medicine. Report ?-.ro. 'j';//72/14.
Sinha, M . M . & Ann is , H. (1973). Pneumoconiosis Field Research}
environmental conditions at Linby Colliery, 1 97'1 . Ins tit- ate of
Occupational !.'od icine . Report ''Jo. T/:/73/3 .
Sinha, M . M . & Thomas, P. (1Q72). Pncumoconiosis Field Research;
onvironmentiil conditions at Linby Colliery, 1970. Institute of
Occupa tip nal \ !ed ic in c . Report No. T'-'/ 7 2/24.
TABL3 12
Elsewhere Underground, and Surface Concentrations
Occupational Group &,
Occupational Group
Serial Number
Sample Mean Concentrations
mg/rn3
Respirable
Dust
Ash
Quartz
Bricklayers 319
1.8
(H)
0.91
0.09
Loco Drivers 332
1.4 (17)
0.65
. 0.06
Linesmen 334
2.9 (H)
1.76
0.18
Ma t« r i a 1 Hand 1 e rs 33 3
2.4
(42)
1.79
Repairers 340
2.9 (86)
1.75
0.2o
Salvage arid 'Jithdrawers 341
2.1 (33)
1.28
0.11
Belt Attendants E44
1.9 (76)
1.06
0.11
Pit Bottom Men 349
0.8 (25)
0.43
0.05
Face Officials 350
2.4
( 5)
1.34
0.14
Other Officials 351
1.4 (25)
0.82
0.08
General -iorkers 353
2.5 (78)
1.52
0.19
' 1 . 9 (55)
1.19
0.16
Surface Others SO
0.4 (21)
0.22
0.03
Screens 34
0.4
( 8)
0.22
0.03
Craftsmen (outbye) 355
.
0.34
( ) Number of observations.
TABLE 12.
TABLE 13
Total Dust Concentrations
*
Ho . of
Samples
Mean Resp.
Dust Cone.
nig/ni3
Intake Rip or
Pace End.
15
3.74
21.3
5.70
Intake Advance
Heading
1
2.03
10.7
5J5
Intake Stable
13
3.85
29:3
7.62
Faceline
22
5.72
23.6
4.12
Return Stable
15
' 8.83
• 31.5
3.56
Return Rip
13
6.17
21.2
3.43
Control Point
16
7.09
16.6
2.34
6
3.19
23.8
7.45
45
2.41
14.2
5.88
7
0.33
2.8
8.39
Mean
5.36
Site
Preparation shift
All Sites
All Faces
Elsewhere Underground .
Surf ac e
-
Mean Total
Dust Cone,
mg/ in 3
P.atio
Total Cone.
Resp, Cone.
* derived from those samples only for which total dust evaluation
could be made.
TABLE 13
TABLE 14
«
Summary of dust concentrations and composition by face and general .environment for 1972
Ratio
Compositional Data for 1972Ash
Llean Cone,
Composition of Ash
in
Ash
Quartz
Sample Quart: sIQicli;
aJ.ig Iron
~2
aro.
Oar o .
/ ^
rnpynr rag/nr
So
/£>
%
5.2
1.01
2.72
0.34
52.4
12.5
7.0
5.9
L39
4.27
1.25
72.4
29.2
-
5.9
6.0
0.94
3.71
0.45
61.9
12.2
21 < 3
4.2
5.5
3.2
-
1.72
0.19
53.6
11.0
25's
-
-
5.0
1.0?
2.85
0.29
56.9
10.3
29-3
-
-
7.9
--
4.86
0.54
61.5
11.2
31's
4.3
5.8
7.2
1.30
4.55
0.6o
63.2
13.1
14.1
Mean Resp. Dust
Concentrations
mg/iii
Class of Environment
Mechanised filling
preparation
Seam
Face
High Main
-1970
197 i
4.7
4.5
16'3
4.3
18's
3's
1
1972
_
Control
ac~
y^
44's
- -
-
5.0
1.61
3J9
0.45
63.7
41'o
«.
^
5.8
_
6.5
1.34
4.5
_
0.66
0.48
ii.2
Hi. 2
5.8 6.0
1.32
4.33
3.53
6.43
67.4 15.1
to. 9 13.7
78.4 21.7
78.4 21.7
63.5 • 14.9
64.0
14.9
67.4 16.6
Seam Mean
Waterloo VI 's
'S<jam Mean
All Seams
All Seams
4.5
3.0
2.5
5.8
L_6-43
1.40
•i .40
2.7
3.81
1.73
0.26
0.57
1 evelopnent
All Seams
8.5
3.1
5.3
3.57
0.59
I SAN COALESCE
All Seams
4.4
5.1
5.7
3.63
.2.55-,
0.54
0.29+
63.6
litone drifting
All Seams
5.2
4.0
4.4
2.84
3^1 sev/here underground All Seams
2.3
2.2'
2.2
Surface
1 .1
0.3
0.4
(}
mber of sr
40.8
12.0
31.5 22.0
39.4 13. .5
39.2
12.7
7.2
9.7
3,1 6.1
6..6 .9.2
6.5 10.4
28.5 22.0
7.6
8.6
59.4+
14.9 39.3 13.6
42.1, 9.4,
6.6
7.4,
9.2
6.2,
0.47
64.6
16.6 35.6
19.9
'4.5
1.34
oJ7
60.7
12.5 30.0
15.0
11.4 12.0
0.22
0.03
57.3
13.0 28.1
17.6
10,4
Valves for 197 1
6.6
8.1
(A20115) IOM (R) ReportCov art
3/15/06
12:32 PM
Page 2
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