Document QXk7NkN2VQLkgE9nbZNEBZ9NL
FILE NAME: Metropolitan Life (ML)
DATE: 1944 Oct 26
DOC#: ML081
DOCUMENT DESCRIPTION: Report - King Mine Asbestos Corpv Thetford Mines - Dust Condition Survey
J- Ut* it // /& .
r :.!AKTJF.;CTUFI"G OPERATIONS No changes have been neae in the .v.ill operations s'nee the first
survey. The only effort at cust suppression consisted in covering sons conveyor
THO'fd OP- SA.<M AND ANALYSIS
The saraoles rere collected and analyzed by the p.ethod devised
(1)
and used by the United States Public Health -Service.
The follovrihg table shor;s the concentrs tions of dust found at
the time of this survey.
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(1)0..5. Public Health Service, Public Health Bulletin =717, Determinetion end Control of Industrial Dust, J.J* Bloomfield_and J.M. Dallave.lls, 1935
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Sample No.
*
Location
1
Crusher house,
picking belts on
primary crusher
41
Kin" Mine
*7
Asbestos Corporation
Thetford Mines. Quebec. Can.
Date of
Sampling
Cu. Ft Air
Sampled
Millions of Dust Particles per cu. ft. air
Type of
Dust
10/26/44
15.0
11.6
Asbestos talc
2
Mill Bldg. 4th floor "
(fans and collectors)
3
Mill Bldg. 3rd floor 11
fibre screening
4
Mill Bldg. 2nd floor "
rock screening
, Mill Bldg. 1st floor 11
bagging
20.0
15.0 15.0 15.0
14.2
17.0 26,6 18.1
II 1
11 II II
Remarks
Test made on spocitu run of small quant ity of rock. Clecr day. Not full pro duction.
Brick building, wooden floors. Windows open. Clear day.
Wooden floor, rlndows open. Clear da;
Concrete floor, windows and doors open. Clear day.
ic c B B B B y rse r
\
-L~
ns m L facilities
Ample toilet facilities sre provided and kept clean. Drinking rater is supplied by bubbler type fountains. Heated rooms or cabanas are located on each floor of the mill building.
o
CONCLUSIONS AND PLCO.'.HENDATIONS
The concentrations of dust found at the time of this survey are much lower than those found in 1930. This may be due to the mill not operating to capacity and improvement in the housekeeping. Covering of conveyors is, no .doubt, a contributing factor also. Fhsn the samples _ere taken, the windows' wer open and the day was clears
It is recommended that efforts be made to further; reduce the cust con--
(2)
centrs.tions. According to the United States Public Health Service, five million
^articles oer cubic foot may be regarded, as the maximum allowable concentration
of asbestos dust. 'HEALTH HAZARDS
There are attached reprints of two studies which may be of interest in
connection with the hazard of asbestos dust: "Effects of the Inhalation of Asbestos Dust on the Lungs of A.sbestos Forkers" "Asbestosis"
(f)rJ.S. Public Health Service, Public Health Bulletin No. r '.l, "A Study of /-bestotis in the Asba'tos Textile Industry", 1933.