Document p2E0eryMDb7O96xXJmO3eQNoE
A',
UOTtk-M.
GOVERNMENT OP WESTERN AUSTRALIA
' MB (*
V fEcmcrandum
- mmu.
j J<i: -.w$
llMtH Ijrm-. ~~t\'r I
7.guc*.kinia.*sgierJ_____ J T Mi m
Ulnti i>eper leant, py^-p*
O^Kf
I
* * I .
Ven ti leueg ^ Australian BiueSefaeeto* ltd. - Wlttenoom.
A visit to me jairttf operated by the ebeve eeerpany wee a*de in tee period 3ith - 2$th way. lest, Underground working * *. placet *t the Colonial mine end the trevtaeot pleat io ttittenoet
forge were inspected. bloing operations at the ffittenoon aloe
were stooped is October last year and the only source of fibre ao* is the Celool*! nine* the projected p*du*ttow of fibre
for 1954 le 18,003 abort tone aad it is evident that ore breaking
is being increased. There are over 220 nan espioped underground et tut aine.
As aireifrvejr vat made aloof the kbjoe level, the rent ing* of *ir velocity be Sag obtained with the valoaeter.
The gxhauat aeaaared at the diacharge froo cbe 60* diaoeter axial
flow fan *aa 7$,l25e.f
The Intake totalled 72,770c f.n. Bede up of
inio Adit
So.2 level go.5 level ko-h level
19,3*c.f.* (Thle say be higher as it ia poeeible the door oo No.2 level mb open).
USOc.f.ia. (leakage naan door la eloaed).' ' '
3i,600e.r,a. (break through at forth vail of gorge
l9.UOOc.f-S.
and subject to variation due to eddylas air current#).
The placing of ftoo/e near the cliff opening* to doe. 1 aid
9 level* has dene etoch to force the airflow through tbe lover work ings. However Z believe that the ioatelletloa 9f doors in fo, j
aA i TWcouta Croat the U*io edit veuld save about IhMOo.f.s. of air frees being abort circuited through worked out areas to tbe r*lo fan* ffeese coots would tend to force seer* air to tbe deeper lv_ele
Coapreseed air end eater apreye which give a edet like
eaterinf to the broken rock are installed at Beat chutes, (there wr
eix chutes requiring sprays) end appear effective in the ioeediete
vicinity of the chute. condition* generally appear eattafsetory,
t
but the enata obtained froa duet seoplee at uhoergreuad working places are very high. It aeeas that there is s considerable aeoust
of very fine airborne duet circulating through the etopes. This
duet sniSt be liberated by the eereplog operations, end again'vhafc
the broken era la drawn off fro the chute# end leaded into the
grsnby truake.
Suet eoueta in the three deeelcpBent coda were ala high,
ynt ttenas nede
well vonttletnd fey owntrlTogtl f*n* ttrawtig Trent
the purest eourcee available, Coe end is veetiiated by s No,31
centrifugal fan and two other snde are equipped with No.31. centri
fugal fane (one ie to be replaced with No.3$ fan). All fens have
IS8 4la*, oaavaa duet attached.
The treeevent plant at Vi(tattoo* was In the beat 03oditIon that I neve ever seen It. This ia bores cut by the duet eoonta ebceinod 2ft the plant. The three rotoolcuee when working eatiafectorily do an efficient operation to reaove the duet created at eeen aechlne. IMinteining * sufficient supply of ester to the
rotoclcoee eeeoe to be e difficulty but thu le being tackled with .
WV-004045
.^t
. j.
^ Mu
*
^ *ihe Installation of larger diameter piping. to counts of 1000
p.p.o.c. *re recorded end twee were obtained In rooms aaclneine breakers end screens. These room are fitted wish exhaust duett to remove the dost. The operators (apsrt free one) eorkiag So those mens ere there for short periode eofi ere supplied ejth res pir# tore for use whilst Id the rooms.
the eeaetruotioa of the ae* trestneat place at too Colonial Bine Is nearly completed. A trial run of the prlwry crushing iMtlee tee to be made on the week-end 51*h Key - let Ju after e conveyor belt hd beea installed la jte.? edit. e ora to be crashed to - It* ead stored la surge bis of 1500 ton cep* Ore ad11 be earted from this surge bln to the trit&aooctt mine. PI end Sotoelene duet collection units are in position to exhaust th dust fro* the treatment operations. it is eotleipeted that dust colleotloo in this treatment plant all! get assy to s good start sad continue aettersctory.
Attached is e copy of the duet count* etri temperstaice recorded underground end results of dust semplse takes in the treemeat ^leot.
hf*. 7*~wLy
ht8T9tC9 TWSPECTCT O? HflBS.
TABULATION OF DUST COUNTS
TABULATION OF DUST COUNTS