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HISTORICAL RESEARCH REPORTResearch Report TM/72/25
1972
Pneumoconiosis Field Research: Environmental Conditions at Morrison Busty Colliery, 1970 Bradley A, Gibbon E, Thomas P
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Pneumoconiosis Field Research: Environmental Conditions at Morrison Busty Colliery, 1970
Bradley A, Gibbon E, Thomas P This document is a facsimile of an original copy of the report, which has been scanned as an image, with searchable text. Because the quality of this scanned image is determined by the clarity of the original text pages, there may be variations in the overall appearance of pages within the report. The scanning of this and the other historical reports in the Research Reports series was funded by a grant from the Wellcome Trust. The IOM’s research reports are freely available for download as PDF files from our web site: http://www.iom-world.org/research/libraryentry.php
HISTORICAL RESEARCH REPORTResearch Report TM/72/25
1972
NOT FOR PUBLICATION REPORT NO. TM/72/25
I N S T I T U T E O F O C C U P A T I O N A L M E D I C I N E
PNEUMOCONIOSIS FIELD RESEARCH
ENVIRONMENTAL CONDITIONS AT MORRISON BUSTY COLLIERY, 1970
by
A. Bradley, E. Gibbon and P. Thomas
Environmental Branch,Institute of Occupational Medicine,Roxburgh Place, ;Edinburgh, EH8 9SU. '(Tel. 031-66? 513D December 1972
Report No. TM/72/25
I N S T I T U T E O F O C C U P A T I O N A L M E D I C I N E
PNEUMOCONIOSIS FIELD RESEARCH
ENVIRONMENTAL CONDITIONS AT MORRISON BUSTY COLLIERY, 1970
by
A. Bradley, E. Gibbon and P. Thomas
CONTENTS
GUMMARY
1. INTRODUCTION
2. MORRISON BUSTY COLLIERY
2.1 Working places and methods of working
2.2 Ventilation and dust suppression
2.3 Manpower and occupational groups
3. SAMPLING AND EVALUATION
3.1 Sampling programme
3.2 Sampling methods and evaluation
*+. RESULTS AND DISCUSSION
4.1 Faceworkers
4.2 Development workers
4.3 Elsewhere underground workers
4.4 Surface workers
4.5 Compositional analysis
4.6 Environmental summary
4.7 Relationship between control point and face concentrations
REFERENCES
TABLES 5-10
Report No. TM/72/25
I N S T I T U T E O F O C C U P A T I O N A L M E D I C I N E
PNEUMOCONIOSIS FIELD RESEARCH
ENVIRONMENTAL CONDITIONS AT MORRISON BUSTY COLLIERY, 1970
by
A. Bradley, E. Gibbon and. P. Thomas
SUMMARY
This report tabulates respirable dust concentrations and compositionsat Morrison Busty Colliery for the period 28th April, 1970 to 3rd April1971• Information regarding methods of working, outputs and manpoweris also given.
The colliery had a coalface mean respirable dust concentration ofVO mg/m3. The mean ash content of the respirable dust was 22*8 percent and the mean quartz content 2*3 per cent (concentration 0*08mg/m3X
PNEUMOCONIOSIS FIELD RESEARCH
ENVIRONMENTAL CONDITIONS AT MORRISON BUSTY COLLIERY, 1970
by
A. Bradley, E. Gibbon and P. Thomas
" 1. INTRODUCTION
This report describes the environmental measurements made atMorrison Busty Colliery from 28th April, 1970, when the new standardsfor Approved Dust Conditions (N.C.B., 1969) were introduced, to3rd April, 1971*. All the:routine dust measurements were again madewith the M.R.E. Gravimetric Sampler, Type 113A, but from February,197P instruments had'been*fitted with slotted nosepieces to minimiseturbulent flow- in the elutriator when sampling in high velocityairstreams (N.C.B.; M.R.D.E., 1971).
The stratification of manpower and method of sampling was aspreviously described (Bradley & Gibbon, 1972). Both the 'randomcollier1 and 'volunteer carrier' sampling techniques were used atdifferent periods during the year.
The dust concentrations are presented in a series of face charts,showing the values for different sites and occupations fpom intaketo return in each face area.
The report also gives general information concerning the collieryand examines the relationship between dust concentrations at controlsampling points in return roadways and on.the faces.
2. MORRISON BUSTY COLLIERY
Morrison Busty Colliery is situated in the north-western part of theDurham Coalfield, at Annfield Plain, some 10 miles south-west ofNewcastle-on-Tyne. , ' \ ;
2.1 Working places and methods of working
The seams worked atJr.Mbrrison Busty are, in descending order, Harvey(02:321)**, Busty (02:̂ 11) and Brockwell (02:̂ 70). The quarterlyoutputs obtained from these seams are given in Table 1.
*In this report the term "year" refers to the period28th April, 1970 to 3rd April, 1971 •,"•
** National Seam Correlation Code .''
2.• TABLE 1 ' ' "'
Colliery outputs (tons)
N̂»_ Seam
PeriooX.
1970April-JuneJuly-Sept .Oct. -Dec.
1971Jain. -March
TOTAL.
% Output
Harvey Busty
\
i2k 22121 61522 362
. 28- 1.46
96 344
4o
23 92817 35128 162
35 ̂ 26
104 867
43
Brockwell
•16 39414 7878 989
• : . , 496 .
. 40 666
1?
Total
64 54353 753;59., 515
•. 6.4 068
241 877
100
Other seam details are given in Tables; 5-9. " . ' . ' ' .^ . . • ' '• ' *' ;
The two faces in the Busty Seam were single unit, longwall advancing,power loaded by rapid ploughs and usually worked two productionshifts in the 24 hour cycle.
The faces in the Harvey and Brockwell Seams were all worked by"N.C.B.Scrapers. They were double unit longwall advancing faces and\u?ually worked three production shifts in the 24 hour.cycle.
Further details-of the methods of working, machinery and supportsfor individual faces are given in Tables,.5-9•
2.2 Ventilation and dust suppression
Average air quantities, dry and wet bulb- temperatures and relativehumidities for the various faces are given in Tables 5-9.
Dust suppression measures/were applied on all faces and in-air dustproducing activities. The main methods of dust suppression adoptedare described in-the tables and were similar to those noted'in thereport for 1969 (Bradley & Gibbon, 1972). . . ' " , . '
Martindale Type "T" dust respirators were available and were usedmostly by facemen in the Busty Seam during periods of high dustconcentration.
2.3 Manpower and occupational groups
The total colliery population at the end of the year was approximately650, of whom 276 were classed as faceworkers, 30? as non-faceworkersunderground and 67 as surface workers.
With the run-down in manpower over the previous two years, and the .concentration of production into a few face areas, a review of thestructure of occupational grouping was made in April, 1970. Thisresulted in the closing of a number of face occupational groupsassociated with hand-filled faces'and replacing all the 29 elsewhereunderground groups by flvo new groups. Later, two of these
3.elsewhere groups, E79» Conveying, All Seams and E80, Haulage andGeneral Workers, All Seams were combined to form E84, Haulage,General Workers and Conveying, All Seams.
Thus, the total number of occupational groups at Morrison Busty in1970 was as follows:
Face groups 13Elsewhere underground groups kSurface groups 3 .
3. SAMPLING AND EVALUATION
3.1 Sampling programme
From April to September the 'random collier' technique was used andthe distribution of sampling shifts was as set out by Ashford &Smith (1956). Of the 119 samples taken during this period, 6k werefor faceworkers, 50 for non-faceworkers underground and five forsurface workers.
From October, 1970 sampling was carried out by volunteer instrumentcarriers as described previously by Bradley & Gibbon (1972). Eachvolunteer was asked to take a sampling instrument to his workingplace at approximately fortnightly intervals.
The volunteers, 5*f faceworkers, 5 developers and 9 non-faceworkerswere selected to cover most occupational groups on all shifts, onall faces and elsewhere underground. No volunteers were obtainedfrom occupational groups such as tradesmen and officials as themen in these groups were either carrying other equipment or movingaround for most of the shift.
The number of samples obtained from the start of the. 'volunteercarrier1 technique in October to the end of the year was 529. Ofthese, 433 were for faceworkers, 88 for non-faceworkers undergroundand 8 for surface workers. The surface samples were obtained bythe unit investigators.
In addition, 10 samples were obtained at control points, 70m fromthe various faces along the return roads.
3.2 Sampling methods and evaluation
The methods of sampling and evaluation of respirable dust concentra-tions and subsequent compositional analysis of the dust continued asdescribed in previous reports (Harrison, 1971? Bradley & Gibbon,1972).
k. RESULTS AND DISCUSSION . .
4.1 Faceworkers
The face summary charts (Tables 5-9 at end of report) show the meanconcentrations of respirable dust for each quarter of the year forall occupational groups. Face mean concentrations weighted to takeaccount of the number of men per occupational group and also cal-culated on a mean sample basis are given. In general, there islittle difference between the two methods of calculating face meanconcentrations. Ash arid quartz concentrations are shown for faceand for site only.
The face mean respirable dust concentrations for coal filling shiftsranged from 2*1 mg/m3 for N10 face to 6*3 mg/m3 for BQ5 face with amean value for all faces of 4*0 mg/m3, slightly lower, than thecorresponding concentration for 19.69i
The groups associated with the highest mean respirable dust concen-tration were the rippers working in the.advance headings of theintake and return roadways of BQ5 face. Mean concentrations of8'2 mg/m3 and 10'9 mg/m3 were obtained for these two groupsrespectively.
c
Preparation shifts were a mixture of coaling and preparation.Fifty-one samples were obtained for these shifts and the resultingmean respirable dust concentration was k*1 mg/m3 - a value muchhigher than the corresponding value for 1969 and even slightlyhigher than the mean respirable dust concentration for all faces,all seams for 1970. That 9̂ of these samples were obtained on theBQ5 and BQ6 faces reflects the dustier conditions in Busty Seamcompared with the others. .
4.2 Development workers. -•
Tables 2 and 3 below summarise the results of the 91 samples takenduring development work in coal and stone drivages respectively.
. • ' ' ' : .. ''TABLE 2 .. • . •
Development in Coal .
Seam
Occupation
O.G.S.N.
Mean Resp. Dust Cone, (mg/m )No. of samples . .. .Standard deviation
Ash Cone. mg/m
.Quartz Cone. . mg/m
Busty
Diggers Dev.
F191
3-66 •
1.«8
1-13
0-19
Brockwell
Diggers Dev,
, F191
4'99
.-- 3*0 •
.:. ,1'54.
0'26
All
r •
k-k15
2«6
1'38 -
0-23
TABLE 3 .
Development in Stone
Seam
Occupation
O.G.S.N.
Mean Resp. Dust Cone, mg/mNo . of samplesStandard deviation
Ash Cone. mg/m
Quartz Cone. mg/m
Harvey
DiggersDev.F191
i-5 -32;i«o
0-4?
0'08
Busty
DiggersDev.F191
V6143'7 .
1-45
0-24
Brockwell
DiggersDev.F191
2*330.1/9,
0-72
0*12
All
2-4762-3.
0'?6
0-13
5.
"3 Elsewhere underground workers
Details of the elsewhere underground concentrations, mean, 1*5 mg/m'are recorded in Table *f.
TABLE k
Elsewhere Underground Concentrations
O.G.S.N.
B81E82
. E83E8*f
Occupation
' • - • . ' •
Outbye Stonemen. •Tradesmen andOther Officials
Deputies & OvermenHaulage & GeneralWorkers ,Conveying
All Occupations . .
No. ofSamples
283
., 1101
133
MeanCone .•mg/m3
2-50-7
2'51-3
1-5
StandardDeviation
2*20»3 '
-1-1
1-5
AshCone.mg/m3
0-950-12
0-MtO'te
0-50
QuartzCone.mg/m3
0-080*01
0'0*t0-03
0-0̂
k»k Surface workers
Twenty samples were obtained for surface workers.' The meanrespirable dust concentrations for the three, occupational groupswere: ' . , . . . -
Washery attendants" Heapstead' attendants
' Surface Others
Compositional analysis
1-2, 0*3 mg/m0*3 mg/m
The compositional analysis of respirable dust consisted of thedetermination, for each occupational group, of the ash, quartz,kaolin, mica, calcium and magnesium carbonates and iron carbonatecontents of samples (Harrison, 1971).
The ash and quartz concentrations for each site are given inTables 5-9 and the detailed composition of the ash for the variousseams and general environments in Table 10.
For coal-getting operations the ash contents of samples from thevarious faces were very similar, ranging from 19*7 per cent (N14 face)to 2V3 per cent (BQ5 face). The values for development work andelsewhere underground were higher at 31*5 per cent and 33*2 per centrespectively.
Quartz contents of samples from coal producing shifts ranged from1**f per cent for the Busty Seam to 2*8 per cent for the Harvey Seam,The preparation samples, which were mainly taken in the Busty Seamcontained 2*2 per cent quartz. The quartz content of elsewhereunderground samples, 2*7 per cent, was similar to that for facesamples but for development work was much higher at 5*3 P*>* cent.
'6.
The quartz concentrations were very similar for ail faces at aboutO08 mg/m3. . . . • . • • .j . . : •
k*6 Environmental summary
Table 10 lists mean dust concentrations for faces and other classesof work; face concentrations are weighted by the number of men inthe occupational groups. For comparison, mean concentrations aregiven .for the proceeding two years. • - . . , - . ........
Of the three seams worked at Morrison Busty, the Busty Seam continuedto be the most dusty. Inv general, the level of dustiness duringcoal-getting operations (mean cone. Vo-mg/m3)-- was" lower 'than that":of 1969. The respirable. dust concentrations for preparation and .coal development work were < slightly higher that for coal-gettingoperations. There was a change in the value for elsewhere under-ground samples from 2*9 mg/m3 in 1969 to -1*5 mg/m3 in the currentyear. . . - . : • • ' - . ' " • • •
V? Relationship between control point and face -concentrations
The .mean respirable -dust concentrations obtained at the controlpoint. (70m from .the face --in the-returri road) for the various faces"are given in Tables 5-9 and from Table 10 it can be seen,.. that theratio of return road concentration to face concentration "rangedfrom 0'50 to 1*15.
The mean value of this' ratio for the colliery, i.e., the ratio of,the mean concentration of all samples taken at the control point onthe coal-getting shifts to the mean of all, the face samplesexcluding preparation and development work, was 1> 26, only slightlylower than the value of 1»*t used by Jacobsen, Rae & Walton (1969)in the Interim Standards Study.
R E F E R E N C E S
Ashford, J.R. & Smith, P.H. (1956). The allocation of samplingeffort in environmental surveys-. N.C^B. Report -No. SC370/ER/28
\ .iBradley, A. & Gibbon, E. (1972). Penumoconiosis Field Research:Environmental conditions at Morrison Busty Colliery, 19&9»Institute of Occupational Medicine Report No. TM/72/15
Harrison, G.E. (1971). Analysis -of gravimetric filters .taken' atMorrison Busty Colliery (1970 - Parts I and II). Institute ofOccupational Medicine, File No. BP31013
Jacobsen, M., Rae, S. & Walton, W.H. (1969). The relationshipbetween dust and penumoconiosis as the basis of a gravimetricstandard for airborne dust underground. N.C.B. Report No.ISM/P(69)11
National Coal Board (1969). Approved conditions for airbornedust. Standards and procedures for sampling,
National Coal Board,' Mining 'Research and" Development Establishment(1971). M.R.E. gravimetric dust sampler type 11.3A instructionsfor operation and maintenance. MRDE Handbook No. k
TABLESFACE SUWARY
Seam N.C.B.Seam Corr. Coal Rank
• Code Code
Busty , 02:411 301a
Site " ;
Method of working
Machine details
Dust suppression
. Supports
•
Site
Occupation(Fitting Shifts)
O.G.SJ).
Number of Men in Occupational Group
Mean Respirable 1st Quarier
Dust 2nd Quarter
Concentration 3rd Quarter
for Occupation ' ' ' '3 4th Quarter
mg/m - —Year
Mean Sample Concentration 3for Site mg/m
Ash Concentration mg/mjQuartz Concentration mg/m
Face . Face ' Type of Face Length Height% ' Starting Finishing —
Carbon Date Date
88 Jan. 1970 . . , . Single unit
Intake Roadway
Hand filled
Hounan drilling machine.
Wet drilling, short holeinfusion, water ampoule,
'sprays
3.66m x 2.44m .arch girders
0
Face Beltmen
F56
2
1.8 (1)
1.8(1)_
1.8 (1)
0.460.04
Intake Stable
Hand filled
Pneumatic pick
Short hole infusion
Hydraulic props andGroetchel bars
91m . 0.84m
\
'
.• . •
2
Rippers
Fifl
6
9.1 (1)
8.2 (2)
7.2 (6)
9.0 (7)
8.2 (16)1.5 »
8.2 (16)1.5*
2.28p.15
Face
p56
2
5.6 (1)
-• — •
5.6(1)
Site 0 .Occupation .
(Preparation Shift)O.G.S.N.
Number of Men in Occupational Group
Mean RespiraRe Dust Concentration ,for Occupation og/ir
Mean Sample Concentration 3for Site rag/si
Ash Concentration mg/miQuartz Concentration mg/ir
Tradesmen
F190
2
.̂2 (1)
SteelCheckers
E79
2
2.3(1)-
2.0 (3)
Overoen
E83'
2
1.4 ll)- .
, 0.5 .
0.44, 0.03
' I 'Rippers < Rippers
F48 } F48
4
4.2(2)0.1
4.2 (2)
1.17 I
4
7.7 (3)0.4
7.7 (3)0.4
2.140.08 [ 0.14
( ) Number of Samples
CHART BQ5FACE
Shift Cycle
2 Productionshifts
_JL
Face
Power loaded
97kli plough
AverageOutput
per Shift
173 ton
Sprays on Intake and returnend of face conveyor andface transfer point
Westphalia self -advancingsupports
Roof
Siltstone
. Return
Seam •
Coal". .
Stable-
'Hand filled
Pneumatic pick
Short hole infusion
Hydraulic props andGroetchel bars
Floor .
Argillaceousseat! earth
Return Roadway
Average TemperatureVentilation Dry 23.3°
Quantity ' Wet 21.1°, 4.97m Vs R<H- ** .
Hand filled
Hounan drilling machine
Wet drilling, short holeinfusion, waterampoule
3.66m x 2.44march girders
Remarks
•
1
Bellmen
-
5J2..;1.10.(
*
Plough Team
F181
8
8.0 (5)
6.4(4)
4.9(27)
5.4 (32)
5.4(68)2.2
.".(69)>
8%
6
Rippers
F48
- .; • 6 • •• •
10.0 (5)
-i - 19.1. (2)
9.7(12), ,.
11.0 (12)
.. 10.9(31)4.2
10.9 (31)4.2
3.05 ' •0.20
7
Rippers " *
F48
6
3.5(1)
3.5(1) .-
3.5 (1)-
0.930.05
9
Shotfirers
F60
2
3.9(1)
3.9 (1)-
3.9 (1)
0.630.07
i
8
ControlPosition
•
8.6; (2)
8.0(3)
8.3 (5)0.6
1.480.14
WholeFaceMean
6.3 +
V3.7 * '
1.800.11
4Rippers
F48
4 •
5.3(9)1.55^ Cj)1.9
1.480.10
6 'Rippers
F48
• 2 •
7.4 (7) -1.8/«4 \i)1.8
2.070.13
7Rippers
F48
2
3.9(1)-
•5.9 (1J
•1.09 '0.07
Shotfirers
F60
.1. .
. 1.5(1)- .
9Steel
CheckersE79
1
10.7 (1)-
6«1 12}' 4.7
' 1.45 .0.11
8 'WholeFaceMean
4.8
5~^3.1 '
U50.10 '
* Standard'bevlation MarHieighted MeanTABLES
TABLE 6FACE SUWARY
SeamSean
Busty
Seam .Corp.cp<te02:411
N.C.B,Coal Rankqoda
301a
Site
Method of working
Machine details
Oust suppression
Supports
Face% Starting
f,firt(pfl P'ltft
88 Oct. 1970
Face -Finishing
Pa-fa
TvBe'of Face Lenoih J(efqht
Single unitLongwall .
' advancing 113m 0.89m•
I ntake Roadway
Hand filled'
Holroan drilling. machine
Bet drilling, water anpoule
3.66m x 2.44m arch girders*
Face
Power
97W'J plough
Sprays atpoint
Westphaliaprops
Site
Occupation(Filling Shifts)
O.G.S.N.
Number of Hen in Occupational Croup
Mean Respirable
Dust; • •
Concentration
for Occupation3
mg/m
1st Quarter"
2nd Quarter
3rd Quarter
4th Quarter
- Year '
Mean Sample Concentration ' 'for'Site .-' , mg/np
• Ash Concentration mg/m^Quartz Concentration" mg/ra3
1 2
'
i . '
.
* . >i -
• ••
»
'. • • • ..
v,;7;/'y""
Plough Team
, F181
7
. X
- - • - . '
?,n /?) :
5.7(23)
5.6 (28)2.9 »
5.6(28)2.9-»
1.2V0.07
PREPARATION
Occupation
O.G.S.N.'
Number of Men in Occupational Group
Mean Respirable Dust Concentration' ,'j for Occupation rag/m
Mean Sample Concentration 3for Site mg/m
Ash Concentration mg/ra^Quartz Concentration ig/r
; Rippers
1 • F48
4
. 2.5(8) ....- 1.0
\ 2 .5(8) .1.0
-' 0.660.04
Rippers
F48 [
4 -
3.8(2). ,1.0
3.'8(2)1.0
1.010.06 .,
Plough Team
F181
14 -
. • • : • • • • & ? : • •3.9 (2)i.r0.86 • -,0.05 .
( ) Number of Samples
CHART ; BQ6 FACE
Shift Cycle
1 Productionshift
loaded
AverageOutputper Shift
160 ton
Roof
Siltstone
; ., -.
face transfer
self-advancing
Seam
Coal
Return
Hand filled
Floor
Argillaceousseatearth
Roadway
Average Temperature CVenti latlon ,o
Quantity . Dry 21.1.„ „ H°+ iq.^
4.47s 3/s R.H. 89*
Ho Iman drilling machine
l-Jet drillingHater ampoule
2.74m x 2.13m arch' girders
Remarks
.
6 " • • • ' •
Rippers
. F48
2
.
4.8 (1)
4.8(1)
4.0 (i)
1.Z8... . ... 0.07
8
• Control • •Position .
2.8(1)
<:.o(i)
0.50, 0.05
1
1,'holeFaceMean
'•
5.6 +
5.6'2.9
13S0.07 <29)
SHIR
.
Rippers
F48
4
2.4 (3)fi-4
2.4 (3)0.4
0.640.04
Rippers
F48
4
3.4 (7)1.63.4 (7)1.6
0.900.05
i>WholeFaceMean
3.4
3.01.3
0.780.05
* Standard Deviation Man-weighted Mean TABLE 6
TABLETFACE SUMMARY
Seam
Harvey
Site
Method of working
SeamCorr.Code
02:321
„ N.C.B.,Coat Rank
Code
301b
Machine details
Dust suppression
Supports
Face% Starting
Carbon Date
86 Sept. 1969
FaceFinishing
Date
Sept. 1970
Type of Fare ^spflth Hftight
Double unitLongwalladvancing 180V 0.56m
I ntake Roadhead
Hand filled
Pneumatic picks
Sprays on conveyor
3.6m x 2.44m arch girders* *
Face
Power
N.C.B. scraper
Hydraulicprops and
Site
'Occupation(Filling Shifts)
O.G.SJ.
Number of Men in Occupational Group
Mean Respirable
Dust
Concentration
for Occupation3
ng/tn
1st Quarter
2nd Quarter
3rd Quarter
4th Quarter
Year
Mean Sample Concentration 3 •for Site ' mg/fli
Ash Concentration mg/m|Quartz Concentration ng/nr
1
Rippers
F148
12'
4
Scraper Attendants
F164
21
0.9 (1)
0.9 (1)
- 0.-
0.0.
( ) Number of Samples
CHART N10 FACEsnm cycle
3 Production1 Preparation
Average -'Outputper Shift
150 ton
• Roof
Sandstone
Seam
Coal
Floor
ArgillaceousSeatearth
AverageVentilation
Quantity
2.32m 3/8
Temperature CDrv 2flO
. Wet 18.3°
Return RoadheadMain Gate Right Tailgate
Remarks
loaded
box, 75kH hoist
chocks, Oobsoncrowns
Hand filled
Holman drilling machine
1.83m x 1.83m arch girders
Face Belt men
F55
6
JI_^_"
6
RTppers
F148
12
4.0 (1)
> 4.0 (1]
4.0(1)' "
0.840.15
7
Rippers
F148
12
2.3 (1)
2.3 (1)
2.3 (1)
0.480.09
ControlPosition
. ... — . _.„ ...
1*0 1 eFaceMean
— —
2.1 *
.2.4 m1.6 V>
0.490.08
Standard Deviation + Man-weighted Mean
TABLE 7
_ ,_
Seam
Harvey
Site
Method of working
Machine details
Dust suppression
Supports
'
Seam .'Corr.Code
02:321
TUX"Coei fan
Code
301b
]
k %Carbon ,
86
Face .Starting
[ -Daie
May, 1970
FaceFinishing
Date .
TABLESFACE SUMMARY
Type of Face Length Height-•:" k " -r — ̂ • ••• ..- ~ —
Double unitLongwall jadvancing; . ' 165m 0.53m
Intake Roadway •
Hand filling
i
i
Pneumatic pick
3.66m x 2.44m arch girders
Face
Power
f
N.C.B. scraper box
Sprays at face
Hydraulic chocks,and crowns
Site i 1
'Occupation(Filling Shifts)
Number of Men 16 Occupational Group
Mean Respirable
Oust
Concentration
for Occupation
mn/m
' i i in. • i-i in i i
—'1st Quarter
2nd Quarter
3rd Quarter
Drillers | Rippersi
•
3 4 6
. — _1
0.8(1) !] 1.0(5)1 T
4th Quarter 0.8 (4)r ! 0.8(1) 0.9(9)Jear i - 0.2 »
Mean Sample Concentration 3 i 0.9 (10) '•for Site
;Ash ConcentrationQuartz Concentration
mg/m ! • 0.2 * ^— _ ~
mg/ir0.18"0.03 '
4
Scraper attendants
21
0.5(1)
L. -1.9 (32)
...— ,.. ..»,....»..»...,.,, ..«M..,,,.M,, , , *„. . « *
—1*5138)1.7(71)0.8
' ' 1.0.
0.0.
1.8 (97)
( ) > Number of Samples
CHART NH FACE
Shift Cycle
3 Productionshifts
Average RoofOutput
• per Shift. Sandstone
125 ton i •
loaded
73kW hoist
transfer point
Dowty props
Seam
Coal
.. '
Floor
Argillaceousseatearth
Return RoadwaysCentre Gate
Hand filled
Holman drilling machine
.'.Wet drilling .Hater ampoule
3.66m x 2.44arch girders
•
; Left Tai Igate
Fired," fi.lled ' '
••Atlas Copco shovel," VHolman drilling machine
.Wet drillingWater ampoule
3.66m x 2.44m ' :
arch girders
Average Temperature CVentilation 'Dry "19~.4"o"
Quantity 'Wet 17.8 °- i>«n« OOjb
1.79n3/s
Remarks
, . , . . . . ,
. . .«
Face Beltmen
F55
6
. V ' ' • <.
2.2(11) .
2.1 (15)Z.Z (Z6)1.0
' ' '
6 . . ; . . -
Rippers
F148
9
4.9 (18)
4.3(17) ,4.6 (35)2.2
- 4,6(35)
- , 2.2 -- :; 0.97
0.18
. 9.
Overmen
E83
' . . . ?
V
2.4(1)
2.4(1)
| ' 2.4(1)' ' V r' t . ; * " '.
' 0.420.03
8
ControlPosition
3.0 (2)
1.4(1)
' •
2.5(3),1,0 -0.610.09
WholeFaceMean
!
2.2 +
2 J» / < I7 \
0.48 '0.07
* 'Standard Oevitation + Man-weighted Mean
TABLE 8
TABLE 9FACE SUMMARY
. — ' " -' ' —
Seam
Brockwell
SeamCorr.Code
02:470
N.C.B.Coal Rank
Code
301a
Site
Method of. working
Machine details
Dust suppression
Supports
*
1
% "Carbon
..90 ,
Face FaceStarting Finishing
Date Date
May 1969. .Dec. 1970.
Type of Face Length Height
Double unit ;•Longwalladvancing 174m 0.61m
Intake RoadheadsLeft Tailgate (2.) Centre Gate (1)
Fired, loaded
r;
• Atlas Coped shovelHolman drill
Wet drillingWater ampoule
3.66m x 2.44march girders
Hand filled
Holman drill
Wet drilling.Hater ampoule
3.66m x 2.44march girders
Face
Power '
N.C.B. scraper box
Face naturally • .
Hydraulic chocks,props and crowns
•-i-jj
Site
Occupation(Filling Shifts)
O.G.S.N.
Number of Men in Occupational Group
Mean Respirable
Dust
Concentration
for Occupation3 -
mg/m
*
1st Quarter
• 2nd Quarter
3rd Quarter
4th Quarter
Year*
Mean Sample Concentration 3for Site mg/ro
Ash Concentration mg/m3Quartz Concentration mg/m3
0
Snottirers
F60
2
2.2 (1)
2.2 (1)-
Z.Z C\) }•
0.350.04
1
Tappers
F53
4i - i••
1.5(1)
2.4(3)
2.2 (4)0.4 * -2.Z (4J ,0.4*
0.510.09
— .1 ..-.- ' ;T,
2
Rippers
F53
4
1.8 (2)
•1.8 (2)0.91.8 (£•}0.9
0.490.08
4
Face Bettmen. *
F57
4
1.9(1)
3.4 (1)
.1.4(7)
1.6 (9)0.9
Borers
F128
2
4.0 (1)
.
4.0 (1) |- I
2.B (W)1.7
0.640.07
PREPARATION
Occupation
O.G.S.N. .
Number of Men in Occupational GroupMean Respirable Dust Concentration -,for Occupation rag/mMean Sample Concentration ,for Site mg/mAsh Concentration mg/m2Quartz Concentration mg/nr
Rippers
F53
2
1.7 (2)
1.7 (2)0.460.07
( ) Number of Samples
CHART S18 FACE
Shift Cycle
2 Productionshifts
AverageOutput
per Shift
110 ton
loaded
75kH hoist
wet
Doirty
Ropf
Siltstone
soan
Coal
Floor Av°ragp Tempfiraturs C •Ventilation Dry 21.5°
Argillaceous Quantity |.|gt 19.6"seatearth .: R u aid
2.90m 3/s R'H' ^
Return RoadheadsLeft Tailgafe (1) Centre Gate (2) Right Tailgate
Fired, loaded
Atlas Copcoshovel
Holman drillingmachine
Met drillingHater ampoule
3.66m x 2.44march girders
Hand filled
Pneumatic pick
^
3.66m x 2.44march girders
Hand filled
Pneumatic pick
!
3.66m x 2.44march girders
Remarks
(1) Period Oct. - Dec.
(2) Period Apr. - Sept.
Scraper Attendants
F18620
2.9(1)
4.2(6)
2.8 (23)
3.1 (30)1.8
6
Rippers
F534
3.9 (5)
3.9 (5)I-5 - i -3.y p;1.5
1.060.17
7
Rippers
F534
3.2 (1)
3.2(1)•
3.2 (1)•
0.750.07
9
Face Beltmen
F57
4
3.5 (1)
4.2 (1)
2.8 (4)
3.1 (6)n.93.1 (6)0.9
0.640.07
8
ControlPnsitinn
3.1 (1)
3.1 (1)
WholeFace
..Mean
2.9 +
2.91.5
0.660.08
SHIFT
,
WholeFaceMean
1.7
1.7(2)
6.460.07
* Standard Deviation + Han-weighted MeanTABLE 9
TABLE 10
SUMMARY OF. DUST CONCENTRATIONS AND COMPOSITION BY FAC? .AND GENERAL ENVIRONMENT
Class of Environment
Mechanised filling
Preparation
Development
COALFACEAll shifts
Stone drifting
Elsewhere underground
Surface
Seam
Busty
Mean Resp. • ; Compositional Data for 1970I Dust Cone, mg/nr
Face1968
BQ5
B Q 6
Seam Mean 4.4
Harvey N 10
N 14
Seam Mean
Brockwell S 18
2.6
!
Seam Mean j 4.6
All Seams Mean 3.6
All Seams
0
D
n
2.5
A.9
3.8
2.5
" 1.9
1.2
1969
6.9
6.4
3.8
3.1
4.1
4.1
4.3
2.6i — I
5.7
4.7
2.9
0.7 I
1970
6.3
5.6
(148)
2.1
2.22.2
(146)
2.92.9
(59)4.0
(353)
(SI).u(15)
ControlFaceRatio1970
1.15
0.50
1.04
Mean Cone. j Ash
Ash
1.80
1.24
' 1.69
0.49
0.48
0.48
1.07i
0.66
0.66
f'
i4.0 j
i
z.4
1.02
1.07
1.38
1.041.04 +
0.76
Quartz „ .rag/in^
0.11
0.07
Coeposition of Ash
Quartz Kaolin .Mica \ Ca. Mg. i Ironsample a <i
24.3
22.3
0.10 23.9
0.08
0.07
0.07
0.08
0.08
0.08
0.07
0.23
0.080.12 +
0.13
(133) i ! 0.50 1 0.040.8 i : \
( 20) ! 0.09 0.01
20.9
19.7
19.7
23.1
23.1
21.9
26.1
31.5
22.822.2 +
31.5
33.2
10.9
t
1
5.9
14.1
11.2
10.2
6.8
16.9
10.011.6 +
16.9
8.1
9.3
38.5
28.3
45.1
35.4
29.1
25.8
34.324.9 +
25.8
38.5
32^
% • i Carb.
10.8
30.5
17.0
20.0
13.7
30.6
19.615.4 +
30.6
13.9
23.9
16.1
8.1
6.0
11.1
16.7
15.1
11.97.0 +
15.1
19.5
!
Carb.
...3.0
5.6
7.5
4.8
1.9
6.4
4.58.7 +
6.4
4.7
Values for 1969 ( ) Denotes Number of Observations
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