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'V JMcN: RM DISTRICT HOSPITAL .................. KA~LflOOBT.TR ........... Date ......l2.th..J.uly..,....1962. p Dr. D.D. Letham, Physician Occupational Health, Department of 'Public Health, 57 Murray street, PERTH : ff.A. Dear Dr. Letham, Under separate cover I have forwarded dust samples from Australian Blue Asbestos, Wittenoom, as follows:** Sample I: Sample 2: Sample 5: Dust collected underground near mine main exhaust. Dust collected from mill exhaust system. Filter pad from respirator of a man cleaning up under the screen in the mill, 6 hour use. I would like a complete analysis of those dust samples to determine (a) the silica and asbestos content and (b) the complete size grading of all the mineral particles, l.e. silica and asbestos. The particle size retention by the mask filter relative to the size of particles in sample, may indicate the mask's effectiveness or otherwise. It may not be possible to obtain this information locally but I feel sure that <t would be worth determining for present use and for future comparison. Yours i aithfullyi, J. licftulty Miras MEDICAL OFFICER c 4170 JMeKtSM UMoon.a 12th July, 1962 Sr. D.D. Lethem, Physician Occupational Health, Dapartment-of Ptfelle Health, 5T Murray Street, PEHTH j WjA. ------- _ __- --------- -------- --- AWgrTIOW; Mr. girwonda Dear nr. Latham, Under separate eover Z hare fawarded dost eaaplea . from Australian Blue Anbastoa, Wlttenoom, ae followss- 8amaie Ii Sample 2i Sample 3i Dust collected underspend near mine main exhaust. Dust eelleeted from mill exhaust eastern. Filter pad from respirator or a man claacting up uader the screen in the mlll| 6 hour use* X *oald llhe a consists analysis of those duet eaales to determine (a) the allies and asbestos content aid (b) the coexists alee grading of all the mineral particles, l.s. silica and asbestos. The particle else retention by tbs mask filter relative to the else of particles in sample, may Indicate the mask's effectiveness or et&erviss. It may not be poeelble to obtain this Infonation locally but X feel sure that it would be worth determining for present uaa and for future comparison* Ur. J. Boylsnd, Senior Inspector of Ulnea Hines Department, KALOOOtJJg. Copy for your inforoatlonc Y Tours faithfully, J. UeTulty TM hgpicg, omen