Document EqQaeG82akmn2xObpZpk7QJ74

FILE NAME: Metropolitan Life (ML) DATE: 1944 DOC#: ML218 DOCUMENT DESCRIPTION: King Asbestos Mine Survey for Asbestos Corporation * KING MINE ASBESTOS CORPORATION Thetford Mines. Quebec. Can. * * *_ A recheck survey of the dust conditions in the mill of this company was mfd.e by the Industrial Health Section of the Metropolitan Life Insurance Company on October 26, 1944* A previous study had been mode in June, 1930. * * * INSTITUTE OF OCCUPATIONAL /NO ENVIRONMENTAL HEALTH MONTREAL, CANADA MANUFACTURING OPERATIONS * No changes heve been msde in the r.ill oper-etions S'*nee the firsi survey* The only effort at cust suppression consisted in covering sons conveyor riETHOPS 'OF Ai.iPlIMG AND ANALYSIS e The samples rere collected end analyzed by the method cevised (1) end used by the United States Public Health -Service. The follotririg table shor;s the concentri tions of dust found at the time of this survey. J A V '/'-nr.--;: Ad/vVO S - - ' (l)U.S. Public Health Service, Public Health Bulletin.?17, Determinetion end Control of Industri?.! Pust, J.J* Bloomfield,end J.M. Dallave.lls, 1935. !i! ' Kine Mine V Asbestos Corporation * Thetford Mines. Quebec. Can. Sample No. Location 1 Crusher house, picking belts on primary crusher Late of Samnlinsr Cu. Ft, Air Samoled 10/26/44 15.0 Millions of Dust Particles per cu. ft. air Type of Dust 1 1 .6 Asbestos talc Remarks Test made on special run of small quant ity of rock. Clecr day. Not full pro duction. 2 Mill Bldg. 4-th floor U (fans and collectors] 2 0 .0 14.8 II Brick building, wooden floors. 1 Windows open. Clear day. 3 Mill Bldg. 3rd floor h fibre screening 1 5 .0 17.0 II Wooden floor, win dows open. Clrcr do; -4 Mill Bldg. 2nd floor h rock screening *s ,Mill Bldg. 1st floor begging 1 5 .0 1 5 .0 2 6 .6 18.1 h h Concrete floor, windows and doors . open. Clear day. PSi^Q-j-L FACILITIES Ample toilet facilities sre prodded and kept clean. Drinking water is supplied by bubbler type fountains. Heated rooms or cabsnss ere located on each floor of the mill building b CONCLUSIONS AND RECO.ViiENDATIONS , . The Concentrations of dust found at the time of this survey ere much lower than those found in 1930. This msy be due to the mill not operating to capacity end improvement in the housekeeping. Covering of conveyors is, no .doubt, s. contributing factor also. Whsn the samples -ere taken, the windows' wer open and the day res clear.. It is recommended that efforts be made to further reduce the dust con-- (2) centra.tions. According to the United States Public He?1th Service, five million particles per 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 dusts "Effects of the Inhalation of Asbestos Dust on the Lungs of Asbestos Workers" "Asbestosis" (P)D.S. Public Health Service, Public Health Bulletin No, ?'1, "A Study of -bestotis in the Asby.tos Textile Industry", 1933.