Document x5zY5d3ez709DOnabO3Oo0OX1
FILE NAME: Asbestos Corp Ltd (ACL)
DATE: 1944 Oct 26 DOC#: ACL005
DOCUMENT DESCRIPTION: Unpublished Report of the Dust Conditions in King Mine, Asbestos Corp, Thetford Mines by Met Life
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Toed- h 7%.
MANUFACTURING OPERATIONS
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No changes have been made in the .'..ill operations since the first
survey. The only effort at dust suppression consisted, in covering some conveyor
riETHODS OF SAMPLING AND ANALYSIS
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The samples' were collected and analyzed bv the method devised
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( 1) '
ana used by the United States Public Health ervice.
The following table shows the concentretions of dust found at
the time of this survey-.
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HTJfiRH J A R '
AQA/AO .4
(1)0.S. Public Health Service, Public Health Bulletin ?17, Determination end Control of Industrial Dust, J.J. Bloomfield_and J.M. Dallavalle, 19?5.
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King Mine
Asbestos Corporation
Thetford Mines. Quebec. Can.
Sample
Location
No.
__________________________
Date of
Sampling
Cu. Ft Millions of Dust Particles
Air
per cu. ft. air
Sampled______________________________
Type
Remarks
of
Dust_____ ;_________
1
Crusher house,
10/26/4A
15.0
picking belts on
primary crusher
2
Mill Bldg, th floor "
(fans and collectors)
20.0
3 ` Mill Bldg. 3rd floor " fibre screening
U ' Mill Bldg. 2nd floor "
rock screening
e. j Mill Bldg. 1st floor 11
bagging
15.0 15.0 15.0
11.6
H.8 17.0 26*6 18.1
Asbestos Test made on spociiL
talc
run of small quant
ity of rocjc. Clear
day. Not full pro
duction.
VIjJ
I
It
Brick building,
wooden floors.
1
Windows open. Clear
day.
11
Wooden floor, win
dows open. Clear da;
II
II
Concrete floor,
windows and doors
open. Clear day.
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PERSONAL FACILITIES
Amole toilet facilities are 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*
CONCLUSIONS AND hC0?.1MENDATI0NS
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. Whsn the samples "'ere taken, the rancors rer
open and the day res clear.
It is recommended that efforts be made to further reduce the cust con-
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centrs.tions. According to the United. States Public Health Service, five mi_lion
particles oer cubic foot may be regarded as the maximum alienable concentration
of asbestos dust.
.
HEALTH HAZARDS
9
m
There are attached reprints of two studies which may be of interest in
connection with the hazard of asbestos dusti "Effects of the Inhalation of Asbestos Dust on the Lungs of Asbestos Workers"
"Asbestosis"
$
(P)TJ.S. Public Health Service, Public Health Bulletin No. 1'.1, "A Study oi
i:-bestotis in the Asbestos Textile Industry", 1933.
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