Document 4vN62NYD4498Y373Zn1m2N0jx

STATS MINING ENGINEER, Ulnae Department, PERTH* KALG00RL3 26th Novber,1948 Australian Blue Asbestos Mins - Wittenoa* Gorge* In company with Inspector ideas and Workmen's Inspect hunter an inspection of the abore mine was made on the 10th September followed by a ventilation end dust aurvey of the underground workings and surface arrangements. UNDERGROUND 3lnoe ray previous visit ih February lest the general ventilation of the mine has furthers improved but with regard to ventilation of dead ends a furthafc. requsat had to ba made for venturi's to oe suspended instead "of lying on the floor or broken dirt. as evidence of this faulty preotiee a dust sample* taken in 7 Right wnere bogging operations were in pro- frees, registered s 1000 fr while the temperature reocrded >0 - 80W. During the progress of the survey the main fan had to be stopped et least three times due to e fault in the power lines causing over heating of the motor, nevertheless the air meas urements revealed e greater volume entering end leaving the mine since lest survey. Following completion of aeaeuremeut of malnialr currents, four sample* of sir containing exnaust gases from the Diesel looomotlve were obtained together with measurement oj air dis charge from venturi. AIR MEASUREMENT. For the purpose of comparison I have quoted the volumes and temperatures reoorded at last survey, In braokete. Intake Return. 24,280 o.f*m. {15,000 * ) 22,856 o.f.m. (21,000 * ) TKPR8ATURE3 Intake Return 63.5W 68W ) Apart from the feot that veoturi'e are being used improperly, the secondary ventilation of development ends was found to be satisfactory, all such ends being ventilated per medium of eleotric mill exhuuat fans. Kith regard to sampling of air containing azhauat gases from tbs Diesel, two of these were obtained in a devel opment end under normal working conditions, namely two journeys, firstly to take out the full truck and a return with empty. 0? 2 Tli# third sample was obtainad at tbs point of an air regulator through which the driver had been specially requested to operate for purpose of obtaining same immediately the loop passed through* The fourth sample was taken in the sain return airway from fan. Aa a result cf the analysis it is very gratifying to report that no CO was found to be pretest and do aot indicate any appreoiable vitiation of the air bjr the produots of oombustloa of diesel engine* sample IB 1A . 3B Oxygen Cc..Oo9; Air flow Temperature 20*72 0.10 Nil fo?$*D 75.0*1? 20.76 0.10 Mil Drift 80D -73* 20.74 0.11 Nil 6578 77D -62W 20.81 0*10 Nil 22,856 e.fcm 7*D -62.75* Attached pleaee find plan shewing latest development and dlreotion of air currents together ~ith points at which air samples were obtained. s.VFThttt. Conditions io the Mill, from a duet point of view were found to be moat unsatisfactory as will be noted in the dust tabulation hereunder:* SAMPLE Situation -------------- ------ Count 0*P>0.0 AlMATm. O Trommel 1000 Pilling begs. 1 Picking belt HU ^ Open. Pair bre#2e blowing. 2 No. J dheksr 1000 Apart from 3 sample Tall end. pots,slide heavily A coated. 5 Sub it Mill 1000 Apart from 3 sample spots, slide heavily coated. 4 Mo. 3 Nolle 318 5 No. 4 Shaker 468 On completion of the Jnape onion, in company with Inspector Adams, an interview was held with the Manager, during the course of whloh attention was drawn to the unsatlefaotory aot up of ths dunfc exbr'-ustlng a7atom and danger to the health of the non. In reply the Manager stated the present plant tould In the near futuro be diaoerded and it sue the iatnetion of the oompesy to ereet a new plant when sufficient d*t.a had been ob tained es a result of operating the present system* Prior to lscving the sins, I was approached by the Engineer with a request for information relative to neaeuremeot of air plow Into the various dudes of the exhausting system as he had no means of measuring same* 3- - TiiU' duly dona ard tne itoglnoer expressed ke? n, appreciation as tits dvtc o'-.j-.p llei *ould caolst 0iik in I aeai^ainK the n rious sizes of *'i?eo re^uiaito for the J cuora effaciant or->r"\tion of tns proposed axhtivistinn unit.jrl UOf.V'-'r\y of I'.iV ou?t M.alS ToCOrled r.t-s ieen fonvnrdau to thu jntat* jar. ./*i/ *<* D|ffT*ICT ISSTSCTOa KIH-jS. 1309 i.