HISTORICAL RESEARCH REPORTResearch Report TM/71/15

1971

Environmental conditions at Fryston Colliery, 1968 Howe JW

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Environmental conditions at Fryston Colliery, 1968

Howe JW 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/71/15

1971

ii Research Report TM/71/15

NOT FOR PUBLICATION Report No. TM/71/15

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

FN12DMQCONIOSIS FIELD RESEARCH

ENVIRONMENTAL CONDITIONS AT FRYSTON COLLIERY, 1968

by

J. ¥. Howe

'-1 MAY 1972

OCCUPA'iiviiAl. MEDICINE

Environmental Branch,Institute of Occupational Medicine,Edinburgh, EH8 9SU.

(Tel. 031-66? 5131) August, 1971

Report No. TM/71/15

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 FRYSTON COLLIERY, 1968

by

J. './. Howe

C O N T E N T S

S U M M A R Y

1. INTRODUCTION

2. FRYSTON COLLIERY

2.1 Location

2.2 Seams Worked and Output

2.3 Methods of Working

2.4 Ventilation and Temperaturer

2.5 Dust Suppression

2.6 Manpower and Occupational Groups

3. SAMPLING AND EVALUATION

3.1 Sampling Programme

3.2 Method of Sampling

3-3 Evaluation

4. RESULTS

4.1 Faceworkers

4.2 Development, Elsewhere Underground and Surface

4.3 Erv.lronmental Summary

4.4 Relationship between Return Road and Face Concentrations

5. OBSERVATIONS AND CONCLUSIONS

5.1 Respirable Dust Concentrations

5.2 Composition

REFERENCES

FIGURE 1

TABLES 4 - 8jlO

Report Wo. TH/71/15

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 FRYSTON COLLIERY, 1968

by

J. ¥. Howe

S U M M A R Y

This report tabulates respirable dust concentrations in mg/m forthe period June to December 1968 at Fryston Colliery. It is thefirst report in which all dust measurements have been made using theM.R.E. Gravimetric Sampler.

A brief account is given of coal outputs, manpower, mining conditions,working places and working methods. riethods of dust sampling andevaluation are also given. Concentrations of respirable dust, withthe corresponding compositional analysis determinations are given intable form at the end of the report.

The coalface (all shifts) concentration at Fryston Colliery was4*3 mg/m3. The mean ash content of the respirable dust was 54per cent. The mean quartz content was 7*1 per cent (meanconcentration 0-31 mg/m3).

PNEUMOCONIOSIS FIELD RESEARCH

ENVIRONMENTAL CONDITIONS.AT FRYSTON COLLIERY, 1968

by.

J. ¥. Howe •

1. INTRODUCTION

Environmental measurements made during Phase I of the PneumoconiosisField Research (P.F.R.) were divided into 'surveys' and reportedapproximately yearly, each report normally covering two surveys.The measurements were summarised finally in a single report (Howe, 1968),In these early reports, the colliery dust concentrations were tabulatedby. occupational group for use later to calculate exposures in a•dust/disease correlation study. At the start of Phase II in-June 1968,computerised storage and processing of data for the main correlationstudy were introduced. This has enabled the form of report to bechanged, to present more clearly the distribution of dust concentra-tions through the mine and the relationship to mining activity.

The present report is the first in the new form, and the first in whishall the routine dust measurements were made with the M.R.E. GravimetricSampler, Type 113A. It covers the period from June to December 1968;subsequent reports will be on a yearly basis. The dust concentrationsare.presented in a series of face charts, showing the values fordifferent sites and occupations from intake to return in each face areatogether with details of the mining conditions and activities. Thereport also gives general information concerning the colliery andexamines the relationship between dust concentrations at controlsampling points in return roadways and on the faces.

2. FRYSTON COLLIERY

2.1 Location

Fryston Colliery is situated in the northern part of the YorkshireCoalfield, approximately two miles east of Castleford.

2.2 Seams Worked and Output

The two seams worked.are, in descending order,,the Flockton Seam andthe Beeston Seam. Details are given in Table-1.

TABLE 1 . . ( . ' •

Seam Characteristics

Seam andNationalSeam Code

Flockton

03: 510

Beest.on03: 830

N.C.B. CoalRank Code

802

•

6021

CarbonContent

(d.m.m.f . )/j

83-5

84-7

Section. Worked

1 -15 m

0-85 m on 50 's1 «4 m on 12 's

i

Remarks

2 thin dirfbands insection worked

No dirt bands (50 's)2 thin dirtbands on 12's

2.

Details of seam outputs are given in Table 2.

TABLE 2

Colliery Output (tons) June 1968 - December 1968

1

Month

June

July

August

September

October

November

December

Totals

Monthly Average

Flockton

35 508

24 501

19 35116 24318 348

35 983

35 800

185 734

26 534

Beeston

14 849

12 718

10 267

9 6558 734

13 010

7 433

76666

• 10 952'

Total

50 357

37219

29 618

25 898

27 082

48 993

43 233

262 400

37 486

2.3 Methods of Working

All five faces in operation during the survey were power loaded, longwall,advancing single units. Details of working methods are incorporated inthe individual face summary charts (Tables 4 to 8). .

2.4 Ventilation and Temperature

Ventilation quantities, temperatures and relative humidities are givenin Tables 4 to 8. The colliery was ventilated by a negative pressuremain fan at the upcast shaft giving air velocities of approximately1 to 2 m/s at the faces. Hear the pit bottom speeds of up to 7 m/swere recorded.

Dry bulb temperatures, which ranged from 22•5 C to 25 C were recordedat the faces. Relative humidities were low, in the range 65 to 73 percent; see Tables 4 to 8.

2.5 Dust Suppression

Mist sprays were used at all transfer and loading points and there weresprays and external jets on all power loading machines (includingmachines in stables and drivages); see Tables 4 to 8.

Dust masks were not usually worn.

2.6 Manpower and Occupational Groups

The average manpower at the colliery over the survey period was 966.Of this number, about 25 per cent were employed on the faces, 55 percent elsewhere underground, and 20 per cent on the surface. Thepopulation was, for the purposes of the research, subdivided byoccupation or working location into occupational groups, the membersof which were expected to have approximately the same exposure to dust.

There were 35 such groups, 19 for faceworkers, 15 elsewhere under-ground and .one for the surface. About half the elsewhere undergroundworkers' were distributed in four occupations, viz., salvage, backripping, conveyor .patrol and craftsmen.

Individual daily attendances in the occupational groups were recordedand accumulated by a mark sense card system. (Hall, 1959; Walker &Page, 1960).

The records, together with occupational mean respirable .dustconcentrations, are intended to provide individual records of dustexposure for use in a dust/disease correlation study.

''.'_ ' : 3. SAMPLING AND EVALUATION

3.1 Sampling Programme

Representatives of occupational groups were selected, as in Phase 1of the research,,.by. the method described by Ashford & Smith (1956)and their environments sampled throughout complete working shifts. '

To examine the relationship between concentrations at the control ;sampling position 23m (25 yards) from the face along.the return andconcentrations measured during routine face sampling, additionalsamples were taken at the control position covering the period the menspent on the face, but excluding travelling time.

The breakdown of the sampling effort is shown in Table 3. . .' * • * . .

TABLE 3 . ' -

Distribution of Sampling Effort'

Location

Face

Control Position

• Development in Coa-1

Stone Drifting . ,

Elsewhere Underground

Surface

Total1 4

No. of Samples

48

132 . .

3... 41

12

119 . . , .

3*2 Method of Sampling •, ••• ••, • ' .;

Sampling was carried out in the same manner as in Phase I of theresearch according to the method laid down by Ashford & Smith (1956),except that the M.R.E. Gravimetric Dust Sampler (Type 113A) was thesampling instrument used.

4.

The instrument was operated by an investigator, who accompanied the •selected occupational group representative for the full duration of hisshift and was positioned as close to the representative1s'breathingzone as safety and non-interference with work would allow.

•A .vane anemometer was used to measure air velocities and a whirlinghygrometer to obtain dry and wet bulb temperatures.

3.3 Evaluation •

Mass concentrations were calculated from the apparent weight offilter deposits after adjustment for changes in the moisture contentof the filters. This adjustment was estimated by observing similarchanges in blank filters kept as controls.

Filters were weighed in batches of 100, of which 20 per cent were keptas controls. During the survey period, two batches were used, themean correction for batch 1 .being +0*23 mg and that for batch 2,,+0'22mg; the mean dust deposit on the filters-was about'4*5 mg.

The quantities of dust recovered from the filters for compositionalanalysis were in good agreement with the weights of dust evaluatedin the field. The mean recovery was 90 per cent of the field •weight. . ' '

The compositional analysis of the respirable dust was carried out bythe methods described by Harrison (1969)'to determine the ash, quartz,kaolin, mica, calcium and magnesium carbonate and iron carbonatecontents. Normally, the recovered dust was ashed and analysed byoccupational group, but for those groups where the amount of dust wassmall, it was retained for analysis with dust from subsequent surveys.

4. RESULTS .

The results are summarised in Table 10. . .

4.1 Faceworkers

Tables 4 to 8 are face summary charts showing the mean respirable dustconcentrations obtained during the period under review. These chartsalso give details of the seam and adjoining strata, descriptions ofthe faces and methods of working. " Mean respirable dust concentrationsare recorded by site as also are the mean ash and quartz concentrations.Locations of face sites and the occupations associated with them are asshown in Figure 1. : . .

4.1.1 Beeston 12s E Face (Table 4). The,face mean concentration was2«8 mg/m3, compared with a mean of 7*0 mg/m at the control position.Concentrations during the four preparation shifts, mean ,t*9 'mg/m3,were generally lower than those on the coaling shifts. Ash and quartzconcentrations, however, were similar on coaling_and-preparation shifts,0«£1 mg/m3, 0«10 mg/m3 an^ 1-00 mg/m3, 0*1? mg/m respectively.

• 5.

4.1.2 -Session 5.0s. Face (Table 5). On this face, which closedshortly after the start of the survey, only two samples were taken.Dust concentration data for the unsampled groups are available fromthe previous survey.

4.1.3 Flockton 21s Face (Table 6). Sixteen samples, covering allthe face groups, were taken during the survey. The 'highest respirabledust concentration (?'5 mg/m3) was obtained in the return stable andwas thought to be due to the combination of face machine and stablecutter operating simultaneously close by.

fy

The face mean concentration was 4-7 mg/m ; the corresponding mineralash concentration wa-- • 7 ' •"T1^ and quartz, 0«37 mg/m3.

t • •

The five^samples taken at the control position gave a concentration of9-3 mg/m for respirable dust, 5-6 mg/m3 for mineral ash and 0«7 mg/m3for quartz.

4.1.4 Flockton 22s Face (Table 7). As production commenced on thisface in November 1968 shortly before the survey ended, the samplingperiod was very limited and only two samples were obtained, one withthe intake rippers, the other with intake stablemen. These samples,6«2 and 5-1 mg/m5 respectively, were high for the intake end of anyface but it was thought that back-ripping operations in the main gatewere responsible. Other occupational groups not sampled (relatingto machinemen and return-stablemen.and rippers) will be .covered infuture sampling.

4.1.5 Flockton 31s Face (Table 8).̂ The highest respirable dustconcentration recorded was 11>5 mg/m from a sample taken during shot-firing operations in the return gate. There were other indicationsthat the return end of 'this face was very dusty (probably due todifficult mining conditions there) and it was unfortunate that nocover was given to stablemen. ,The face mean dust concentration was4«9 mg/m3, the ash was 2V7 '.g/m and the quartz 0-37 ..a'/m̂ .

' *3t

The four control position samples gave a mean value of 10*4 mg/mfor respirable dust.

4.2 Development. Elsewhere Underground and Surface . .

4.2.1 Development in Coal (Table 10). Only. two. coal .developmentsamples were taken, both in the Plockton Seam (22s district). Theconcentrations were 10-6 and,2«1 mg/m̂ . The mean mineral ashconcentration was 3'98 mg/m and the mean quartz concentration".0-62 mg/ro?. ...

4.2.2. Stone Drifting (Table 10). Three samples were taken withthis group, two in the Flockton Seam (concentrations of 3.0 mg/nrand 3-4 mg/m3) and one (1»1 mg/m3) in the Beeston. . The analysis,gave nean concentrations of 1*4 mg/in3 for mineral ash and 0 .19for quartz. • •

6.

4.2.3 Elsewhere Underground (Table 9). All elsewhere underground •groups at the colliery were sampled. For the purpose of comparisonthe samples shown in Table 9 have been divided into three groups, bylocation or activity, as follows:-

(i) Samples taken in coal-carrying roadways, at transfer points andin the general face areas.

(ii) Samples taken during dusty operations (non-coal) in miscellaneousroadways; •

(iii) Samples taken away from face or other dust making operations.

Details of mineral analysis is given in Table 10.

TABLE 9- • :

Samples takeh elsewhere underground

OccupationalGroups

E21E22E51E52

E53, E54. F ••'•

E31E35E36E45

E20E48E49

Description

Loco. HaulageMaterial DriversConveyor PatrolFitters /ElectriciansOfficialsMarketmen

SalvageBricklayersRoadlayers .Back rippers

Mechanical HaulageGeneral WorkersPit Bottom

Location

Coal carryingroads; transferpoints; generalface area

Miscellaneousroadways

Roadwaysaway from faces;pit bottom

Mean RespiDust Cone.mg/m3

r

2-4

. 2-8 .

0-6

i

No. ofSamples

25

11

.8

Rangemg/m^

1.1-4.4

1-3-5-2

D-1-2-4

4.2.4 Surface (Table 10). Twelve samples were taken on the surfacewith very low concentrations (mean 0'5 mg/m3).

4.3 Environmental Summary

Table 10 summarises the data given in the charts and in the' text andgives additional information regarding the composition of the ash.

Little difference was observed between facemean concentrations, exceptthat Beeston 12s E (at 2-8 mg/m3) was less dusty than the others. .

The Flockton Seam mean concentration (4«8 mg/m ) was considerablyhigher than that of the Beeston Seam (3-1 mg/m3). Similarly, thequartz concentration in the Flockton Seam, 0«37 mg/m3, was over twicethat in the Beeston.

7.

4.4 .Relationship..between. Control Position and Face Concentrations(Table 10)

Consistently high values for this ratio were found on all the facesfor which data were available. The highest ratio 2*50, was recordedfor Beeston 12s E Face. This was in contrast to the value of 0»8reported by Annis & Birkin (1968) for the ratio at Fryston Collieryand above the value, 1«4 used by Jacobsen, Rae & Walton (1969) in theInterim Standards Study.

5. OBSERVATIONS AND CONCLUSIONS

Apart from the few groups on Flockton ?2s face, mentioned in section4.1.4 all occupational groups at th-. colliery were sampled during theperiod under review. Almost equal proportions of the sampling efforthave been directed towards faceworkers and elsewhere undergroundgroups.'

5.1 Respirable Dust Concentrations

The face mean concentration on coal getting shifts was 4«3 mg/m(50 samples) with a maximum figure of 11 «5 mg/m3 obtained onFlockton 31s face.

Generally the highest concentrations were experienced by workers atthe return end of the faces.

•2

A mean respirable dust concentration of 1 «9 mg/m was recorded onpreparation shifts.

For elsewhere underground workers, the mean concentration ofrespirable dust was 2-2 mg/nP.

A very low mean dust concentration (0«5 mg/m ) was obtained withsurface workers.

The seam mean ratio of scientific control point concentration to facemean concentrations was 2-26 in the Beeston Seam and 2«04 in theFlockton Seam.

5.2 Composition

The concentrations of mineral ash and quartz obtained from samplestaken in the Beeston Seam were slightly less than half of the corres-ponding values for the Flockton Seam; between seams the ash contentdiffered considerably, 41 per cent for the Beeston Seam and 57 percent for Flockton. This differed from the previous survey when theash content, 54per cent, was the same for both seams. (Harrison 1969).

The mean quartz content in ash was 13 per cent, indicating 7*1 percent of quartz in the sample.

The combined kaolin and mica content averaged 60 per cent in ash and32 per cent in sample. The calcium plus magnesium and ironcarbonates in total sample were low at 3 per cent and 2 per cent,respectively.

o9

R E F E R E N C E S

Annis,R. &Birkin, J.M. (1968). A note on a comparison of dustconcentrations measured under the 'Approved Conditions' schemeand in the Pneumoconiosis Field Research. Institute ofOccupational Medicine. File No.. BP.31102.

Ashford, J. R. & Smith, P. H. (1956). The allocation of samplingeffort in environmental surveys. N.C.B. Report No. SC.370/ER/28.

Hall, P. G. (1959). The training of clerks in mark senseprocedure. P.F.R. Internal Report No. 8.

i

Harrison, G. E. (1969). Analysis of gravimetric filters taken atFryston Colliery. Institute of Occupational Medicine. FileNo. BP.31006.

Howe, J. W. (1968). Summary report on environmental measurementsat Fryston Colliery 1954 - 1968. N.C.B...Report No. P.F»R»/ER/3£7.

Jacobsen, M., Rae, S. & ¥alton, W. H. (1969). The relationshipbetween dust and pneumoconiosis as the basis of a gravimetricstandard for airborne dust underground. N.C.B. Report No.

Walker, M. C. & Page, D. il. (i960). Internal instructions for themanipulation of personal cards and summary cards. .P.F.R. Internal Report No. 10.

!',";/1UTE OF

OCCi: ,.,,KA

/ \

-

3 5

6

•

^ 4 — -£ 4 ^' • • m L1 . . . . - * . IILJB.1- . 4..MM— | | I.V. ._... 1 -. T ^ '

Direction of ventilating currentshown:- ^. control

7

V'8

9

i

A

23m

\/

position

Site

0

1

2

3

4

5

6

7

8

9

Description

Intake roadway

Intake ripping

Intake advanced heading

Intake stable

Face

Return stable

Return advanced heading

Return ripping

Control position, 23m from face

Return roadway

FIGURE 1 Key to the Location of Face Sites

FIGURE. 1

Seam

Beeston

N.C.B.CoalRankCode

602

%Carbon

84«6

FaceStarting-Date

Dec.1967

FaceFinishingDate

Feb.19S9

l

TABLE 4

PACE SUMMARY CHART

Type of Face: Single Unit Longwall Advancing

Length: 125m Height: 1<

Shift Cycle: Two Shifts Coaling:One Shift Prep.

Average Output per Shift: 420 ton

12s E FACE

Roof: Dark Grey Shale

Seam: Two thin dirt bands in section worked

Floor: Strong Dark Grey Mudstone Seatearth

Average Ventilation Quantity: 4-25 m /s

^Temperatures: 25 C. Dry, 21-5°C. tfe't, R.H.: T\fo

SITE

Method of ¥orking

Machine Details

Dust Suppression

Supports

INTAKE RIPPING

Bored, fired and handfilled

Electric borer

3«7 x 3* 1m arches,hydraulic props andGroetchel bars

INTAKE STABLEBored, undercut, fired,hand filled

A.B.15 cutting machine,electric borer

Sprays on cutter

Dobson propsGroetchel bars

FACE RETURN STABLE RETURN RIPPING

Power Loaded j Bored, undercut, fired,j Bored, fired and handhand filled i filled

90 kW Conveyor mounted Trepanner

Sprays on Trepanner

Hydraulic chocksGroetchel bars

COAL GETTING SHIFTS

A.B.15 cutting machine,electric borer

Sprays on cutter

Dobson props! Groetchel bars

Electric borer

3-7 x 3-1m arches,hydraulic propsand Groetchel bars

REMARKS

Site +-.. — — . —Occupation

O.G.S.N.

Mean Resp. DustConcentration forOccupation mg/m3

— .—~.- I , i . .Mean Resp. DustConcentration bySite mg/m3

Ash

Composition Coi)c$mg/m-J

by QuartzSite Cone.

ing/nr

1

—FaceRippers

IntakeF.345

2-4*(1)

—

2.4*(1)

-

0-56

0.05

1p

Shotfirersand

StemmersF.93

1-7(1)-

i

1-7(D

1.00

0.14

3

StablemenIntake

F.376

3-2(1)

3-2(1)

1.32

0-15

3p

Marketmen

F.44

2-4(2)

1-7 - 3-11.0

2-4(2)1.0

L20

0.15

4._...... ..... , -_

MachineOperators

F.375

2.4(3)

2-3 - 2.40-3

2«4(3)0.3

0.79

0.09

L 4P

Officials

E.531.1(1)

._ .. ~__, . ,

1.1(1)

0-57

0.03

5

StablemenReturn

F.376

2-9(D-

2-9(D

1.19

0.13

71

FaceRippersReturnF.345

3-8(1)

h- H

3.8(1)

. . •

0.89

0-08

8- - *

ControlPosition

7-0(4)

4-9 - 10.12.4

7-0(4)2.4

•1.76

. !

0-17

+ See Figure 1 for site location * 2«4 Mean Respirable Dust Concentration mg/m(l) No. of Samples- Range- Standard Deviation

TABLE 4

TABLE 5

FACE SUMMARY, CHART

50s FACE

Seam

Beeeton

N C R

CoalRankCode

602

%Carbon

8*f?

FaceStartingDate

September1966

FaceFinishing

Date

July1968

Type of Face:

Length: 215m

Shift Cycle:

Average Output

Single Unit, Longwall Advancing

Height: 0»85m

One Shift Coaling:Tv/o Shifts Prep.

per Shift: 200 ton

Roof:. Dark Grey Shale

Seam: No dirt bands in section worked

Floor: Moderately Hard Dark Grey Mudstone Seatearth

Average Ventilation Quantity: 4*00

Temperatures: 25°C dry, 21-0°C wet, R.H.:

SITE

Method of Working

Machine Details

Dust Suppression

Supports

INTAKE RIPPING

Bored, fired, handfilled, in advance offaceSamson loaderMarkham crusher tjadsto\sir;.-* electric borer

Sprays on loader

V3 x 3' 1m archeshydraulic props andGroetchel bars

INTAKE STABLE

Bored, undercut,fired, hand filled

A.B.15 cuttingmachine, electricborer

Sprays on cutter

Dobson propsGroetchel bars

FACE

Power Loaded

90 kW Coveyor mountedTrepanner

Sprays on Trepanner

Hydraulic chocks, hydraulicprops, Groetchel bars

RETURN STABLE

Bored, undercut,fired, hand filled

Electric borer

Sprays on cutter

Dobson propsGroetchel bars

RETURN RIPPING

Bored, fired,hand filled

Electric borer,slushing machine

^•3 x 3* 1m archeshydraulic props andGroetchel bars

REMARKS

COAL GETTING SHIFTS

SITE+

Occupation

O.G.S.N.

Mean Resp. DustConcentration forOccupation mg/m3Mean Resp. DustConcentration bySite mft/m5

AshCone.

Composition . mg/nr

Site Quartz1T;e Cone.

ing/m?

2

Face RippersIntakeF367

3'8*(1)-3'8*(1). . . . _ .

2-66

0*36

3

•StablemenIntakeF365if.y(1)

/f. 7(1)_

3-23

0»^fl

. k

Machine Operators

F36̂ f___

. . . ...

5 . . . .

StablemenReturnF365„__

7

-RippersReturnF366 ;

—

_

8 -

ControlPosition

___

+ See Fig. 1 for site location *3*8 Mean Respirable Dust Concentration mg/m(1) No. of Samples- Standard Deviation

TABLE 5

TABLE 6

PACE SUMMARY CHART 21s PACE

N.C.Io „ CoalSeam n .Rani

CodeI

t

Plockton j 802

1

SITE

Method of Working

i

Machine Details

Dust Suppression

Supports

SITE +'• Occupation

O.G.S.N.

Mean Resp. DustConcentration .forOccupation mg/m3

Mean Resp. DustConcentration bySite ing/up

AshComposition cone,

by iag/m3

3. f ! '_ ,̂ Starting Finishing

c Carbon i -. . & ^ .j Date DateIiji ;

o~.c ' September November5 5 j 1967 | 1968

r - - - - - - -

Type of Face: Single Unit LongwallAdvancing

Length: 201m Height: l'15m

Shift Cycle: Two Shifts Coaling:One Shift Prep.

i Average Output per Shift:ii :

• .—„.--,- ... . . .... — - - - - - -

INTAKE HIPPING ' INTAKE STABLE -

Bored, fired, hand filled Bored, undercut,fired , handfilled

j Electric borer A.B.15 cuttingmachine,electric borer

Sprays on cutteri

3*7 x 3 '1m arches, hydraulic props and Dobson props! Groetchel bars Groetchel barsI

COAL GATING

1 3; Marketmen Shotfirers Pace Stablemeni and Rippers < Tn-HlcpStemmers Intake intake

P. 44 P. 93 F.304 P. 3742'3* 3'3 3*1 2'1

• 1-9 - 4-6- I - i 1*1 F

3'0* 2-1(6) (1)0'9

1«70 1'22

Site Quartz,cone.iag/m3

1 0«23 0'17:

240 ton

_.-__-._—._____FACE

Power loaded

Roof: Dark Grey Shale

Seam: Two thin dirt bands in section worked

Floor: Moderately Hard Dark Grey MudstoneSeatearth

Average Ventilation Quantity: 7*00m3/s

Temperatures: 22-5°C dry, 18-0°C wet,R.H.: 6$

RBTURN STABLE

Bored,undercut,

! fired, hand

90 kW Conveyor mounted Trepanner

Sprays on Trepanner

filled

RETURN RIPPING REMARKS !\Bored, fired,hand filled

A.B.15 Electric borercutting

electricborer

Sprays on

Hydraulic props and Groetchel bars

SHIFTS

Marketmen

P. 445-4(2)

4.3 - 6*61.9

4MachineOperators

P. 3735*7(2)

5-0 - 6-4I'O6'0(6)1-5

3-49

0'47

Fitters

cutter

Dobson propsGroetchel

i bars

5 ,Stablemen

andElectricians

E.527'0(2)

6-2-7'!•1

8

Return

P. 374

4-6 - 10*44-17«5(2)4-1

4-35

0'59

3-7 x 3-lm iarcheshydraulic props,Groetchel bars ;

7 8Face Rippers

Return ControlPosition

F.3043'6 9'3(i} e.2̂ 13.3

3«2

3*6 9'3(1) (5)

3'2

2«08 5-64

0'29 i 0»71i

See Figure 1 for Site Location * 2»3 Mean Respirable Dust Concentration(l) No. of Samples

Range- Standard Deviation TABLE 6

TABLE 7

FACE SUMMARY CHART

22s FACE

Seam

Flockton

N.C.B.CoalRankCode

802

%Carbon

83'5

FaceStartingDate

November1968

FaceFinishingDate

April1970

Type of Face: ff gle Unit, LongwallJr Advancing

Length* 202m

Shift Cycle: Three

Height: l»15m

Shifts Coaling

Average Output per Shift: 300 ton

Roof: Dark Grey Shale

Seam: Two thin dirt bands in section worked

,.„ Moderately Hard Dark Grey MudstoneFloor: Seatearth

Average Ventilation Quantity: 7*00 m /s

Temperatures: 22«5°C Dry, 18*0 C Wet, R.H.: 65$

SITE

Method of Working

Machine Details

Dust Suppression

Supports

INTAKE RIPPING

Bored, fired,hand filled

Electric borer

3*7 x 3*lffl archeshydraulic props andGroetchel bars

INTAKE STABLE

Bored, undercut,fired, hand filledA.B.15 cuttingmachine, electricborer

Sprays on cutter

Dobson propsGroetchel bars

FACE

Power loaded

90 kW Conveyor mountedTrepanner

Sprays on Trepanner

Hydraulic chocksGroetchel bars

RETURN STABLE

Bored, undercut,fired, hand filledA.B.15 cuttingmachine, electricborer

Sprays on cutter

Dobson propsGroetchel bars

RETURN RIPPING

Bored, fired,hand filled

Electric borer

3*7 x 3*lm archeshydraulic propsand Groetchel bars

REMARKS

COAL GETTING SHIFTS

SITE+

Occupation

O.G.S.N.

Mean Resp. DustConcentration forOccupation mg/nrMean Resp. DustConcentration bySite mg/m3

AshCone.

Composition mg/m5

Site f**tzCone.

1

Face Rippers

F30if

6'2*(1)_

6-2*(1)

-3*58

0-50

3

Stablemen

F389

5-1(1)_

5-1(1)

2*96

O'̂ O

k

Machine Operators

F388

5

StablemenReturnF390

7

Face Rippers

F30̂

8

ControlPosition

___

+See Fig. 1 for site location *6«2 Mean Respirable Dust Concentration mg/m(1) No. of Samples

Standard Deviation

TABLE 7

TABLE 8

FACE SUMM3I CHART 31s FACE

Seam

•— - • • -- —

Brockton

N.C.B.CoalRankCode

802

fiCarbon

83-5

FaceStarting

Date

Hay1968

Pao-eFinishing

Date

^^

i

Type of Face: Single Unit Longwall advancing | ! Roof:

Length.: 202m Height: 1.15m

Shift Cycle: Three Shifts Coaling

Average Output per Shift: 400 ton

Seam:

Floor:

Average:

Dark Grey Shale

two thin dirt bands in section worked

Moderately Hard Dark Grey Mudstone Seatearth

Ventilation Quantity: 9«8 n?/s

Temperatures: 22.5°C. Dry, 18°C. Wet, R.H.: 65^

SITE INTAKE RIP1ING

Method of Working j Bored, fired handfilled

Machine Details

Dust Suppression

Electric borer

Supports 3«7 x 3' 1m archeshydraulci props.and Groetchel

INTAKE STABLE

Bored, undercut,fired, handfilled

FACE

Power loaded

RETURN STABLE RETURN RIPPING

Cut, fired, hand j Bored, fired, hand

A.B.15 cuttingmachine, electricborer

Sprays on cutter

Dobson propsGroetchel bars

Conveyor mounted Shearer

Sprays on Disc Shearer

Hydraulic chocksGroetchel bars

filled

A.B..15 cuttingmachine, electricborer

Sprays on cutter

filled

Electric borer

REMARKS

Dobson propsGroetchel bars

I 3-7 x 3«1m arches| hydraulic props,' Groetchel bars

COAL GETTING SHIFTS

+ See Figure 1 for site locationry

* 4.3 Mean Respirable Dust Concentration mg/m3(3) No. of Samples

2«y -»7«2Range2»-6 Standard Deviation TABLE 8

SITE +

Occupation

O.G.S.N.

Mean Resp. DustConcentration forOccupation mg/m3

--

Mean Resp. DustConcentration bySite mg/nr

AshComposition Cone.

, mg/m3by •*

QuartzSlte Cone.

mg/m^

1

Face RippersIntake

F.356

4-3*(3)

2-7 - 7-22.6

4.3*(3)2.6

2-57

0-35

3

StablemenIntake

F.378

3.7(3)

3 - 3 - 4 . 20.4

3»7(3)0-4

2.08

0.29

Market-men

F.44

3-4(2)

3.1 - 3-81.0

4

MachineOper-atorsF.377

3-5(3)

1.6 - 5-'.1 -9

H(8)1.2

2.C

0.2

Fitters

Efec.trjcians

B.5^

4-1(2)

2-9 - 5-31.7

J

>

)0

7

Officials

E.53

4-7(1)_

- - -T-. - -T -

5 | 7 ' TI Shotfirers Face

and RippersI Stenuaers Return! F.93 F.356

11-5 8.4(1) (2)

5-4 - 11-54.5

9.5

(3)

3-4

5.64

0-78

8

ControlPosition

10-4(4)

2-9 - 18.06.2 j

10.4(4)6.2

6.10

0.84

TABLE 10

Summary of Results, June - December, 1968

Classof

Environment

MechanisedFilling

PreparationDevelopmentin CoalCoalface(All Shifts)StoneDriftingElsewhereUnderground

Surface

\ MeanResp.

Seam i Dust1 Cone .

. ;| mg/m3

Beeston12's E 21®

j ^>5°'S ! (VSeam Mean j ,1-.

Flockton

21' s

22' s

31's

Seam Mean

All Seams

it it

M it

it ii

ti ti

!

4.7(16)5.6(2)4.9

t (17)| 4.S

/ -ft- \(35)

1.9(4)6.4(2)

4.32.5(3)2.2(41)0.5(12)

Con. PosFace Mear

Ratio

2.50

Analysisof Resp. Dust

i AshCone,mg/nr

0.91j

1.98

-

2.12

-

2.91

1.26

2.70

3.24

2.73

QuartzCone .mg/m3

0.10

0.38

0.14

0.37

0.45

0.37

2.72 j 0.37

1.00

3.98

2.31

1.38

1.12

0.23.

0.13

0.62

0.31

0.19

0.15

0.04

Ash

Sample%

40.7

56.7

52.6

62.2

53.7

55.3

50.9

46.5

Composition of AshQuartz

%

11.1

13.7

13.2

15.7

13.3

14.1

13.7

15.5

Kaolin

%Mica \ Ca. Mg

%

t

24.7

25.1

23.3

19.6

24.6

23.4

23.2

24.2

27.2

37.3

32.0

37.2

35.0

36.0

30.3

24.4

Garbs.

6.2

5.5

8.4

3.3

5.8

2.0

6.0

-

IronCarb.

6.4

3.6

4.7

2.9

4.0

3.9

4.2

- -

Figures in brackets indicate number of shifts

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