Document pp28Ne0RVEDaYyrpvY9nY1vB6

PLAINTIFFS exhibit WV-03876 PPOOuaDlNMATTXno BARROW V W1DALCO NO 1148 or >967 o') CCCCD IN MATTER OFSs--^ Hu'.iV MiDALCO NO 1161 or IC&7 14th December, 1942. TI81T TO ASBESTOS MILL. ZmB_^DgCgMREB. 194R, The sain difficulty at the alii until juft prior to sy arrival/had been to aspirate asbestos fibre .Voa the screens without also aspirating grit and dust. 1 few day* before 1 arrived, however, Mr. MeRobert* ?ud erected a troaaei in front of the nain aspirating screen ^ and this screened out sost of tho fine grit and *a; a Bftjor improveaen* t. Other alterations nude during the period of ay visit werej- I?Sg Is f -4? u 8< |#5 --' -5 #5 1? *. Q.#f A (1) Extra buckets were fitted to the stain elc.stcr in order to Increase its capacity. (2) Two e*tra nanmer bars were fitted to the Kubit lili and this 04chine was speeded up fro 900 to 1800 r.p.a. (s) Adjuatoento were aade to the Gyratory Cru..*..r to enable it to crush finer and s new eccentric bush is bei&c ordered for this machine Co enable it Co crush still tsar* finely. (4) The size of ore from t&e jaw crusher was increased in order to prevent asbestos fibre being overheated -i.d discoloured is the drier. (&) the use of Ho. 1 fan and cyclone to aspirate . fibre from Ho. i screen was discontinued as the sbjlI amount of fibre collected at this stage was discoloured ;.ad this fan (Q) the was reversed in order to use the UO^vU'c, *4'^' unworn side of the banners in this machine. kitf fh* jail! i9 running quite well and with the above alteration* appear* capable of producing froa o.j about 1 % tons of asbestos per day. The asbestos is fairly cleg*; and roughly equivalent to grade 4K. To increase t .ls WV-03876 PRO01XCD IN MAVTCROF BARROW V M1DALCO NO iS80F W7 ___1. R'^'D CLD:NMMTSRC. Kuv MiDALCO NO 1161 or IOT < capacity, additional plant lUl be required but an estimate of the cost of this has net yet been made. tftie ail! has been veil erected and Mr. KcRobwrta has done a very good job. This is particularly creditable as be has been without adequate assistance and in a locality where weather and supply difficulties have been moat severe* I? &?S S', X! Oi CO 7 . a* 43 m***a***i*~ttL*LlMM^****mmmm*m*immKrl, It is not possible as yet to assess accurately the prospects of the venture as these are almost wholly dependent on the mining side and this is the side to which careful attention must be paid from now oru Here iso, additional plant such as hoppers, flying foxes, u_o.es, etc. should be provided lcusicdiutely, X consider, but an estimate of the cost of such equipment has not yet been prepared. One major difficulty shall have if we wish to increase production by wonting more.than on# shift, or if e wish to inatal new plant whilst maintaining pi eduction, is manpower. The Vest Coast district of Tasmania is very short of men at present and I understand men have been taien away even from Kt. lyle to assist with the production of foodstuffs. Mr. A.E. kinder baa promised, howevoi, that rw will advise the Tasmanian Kan Power Authorities to accord our asbestos project an equal priority with food and umber. Por record purposes, a copy of aotcj taken whilst in Zeehan, also a copy of notes I left for Mr. KcRot- rta guidance are attached. Portion of the attached notes deal with a visit to tfc i Mt. lyle Co. end wish particularly to stress the court and co-operation displayed to me by each officer of this Company whom l have met. pRODijcw m MA'ntf?of , BARROW V MiOAtCO NO J J4#OF J97 PttOOUCLD SN MATTER OF HtYlV i-'lOAf CO NO U61 OF V.i7 10th December, 1943. 0 .. HOTSg rpfl.MB. IlCffQBERTB. i V should consider no* that the asbestos aili la definitely in production and hence should be operated i each day Just as any other working concern. In other words, the asla object now will be to operate contiaously and to obtain maxInna yield and production of good clean fibre. She question of additional plant such aa Junto, trommels, rolls etc. will be taken up by me on return to Sydney, but in the meantime, you should gradually go <-v I >- IMIMI I ibMii--inimii mi rifc A If this fan proves to ve too wall, please advise us. Also an elevator to iaturn overs from So. S screen to Torrey cyclone should bo erected ............ mm y* hv^ Is regards mining, at present the supply will continue <b*\to come fros the spur end frog the asin hill near Ho. 1 jjM tunnel (by lorry), when the spur Is exhausted and I will bV^r1*take up the matter of flying fox, hoppers, trucks, drying sheds etc. in Sydney. The traa around to Ho. 2 tun .el should be continued as labour permits as this will viovido dfje^jeoCJ a? $ U.' #& j?## to a good place for ousping barren rock. Tou ahouic obtain a firm price for the flying fox at T.A.T. As regards the mill, it appears to me that the woven wire screens (particularly the fine types) an<* the haaaers in the Torrey and Kubit will wear rapidly and you should c. ensure that ample spares of these are kept in band to avoid . oU-LDlNMAntaCK liAflROVV V MSDAiCO Noras oil viat? WSfeBfiUi BBCSMBEq, ,1342. pRooixruowMATr Hu\ J V , '* NO IK'.vr Oft.Saturday 4th Cececbwr, I visited the alii a-.d too* same photographs of the till and of the hill f?oa variousfaepacta and also ran the plant for a short period lth ore which was In the drier, the gyratory crush*/ was cot working, but Mr. MeRoberts is to reassemble it and get it back in r;orKing condition *e*dy for SbAday morning. The whole plant id rather dusty but id wowenn u m-- M unbearable. Clouds of dust rise so thickly, that the machine cannot be seen. From what I saw on Saturday, I considered ip w.s noi 4 ^ i^aVworthwhllo aspirating from Ho. 1 screen as A* L- i .bre here is short and discoloured and hence we rfu tf* 06 \\u* *d fIiIrI Mr. Howard, Timber Mill Proprietor, took MeBoberts and self to Benison Belle on Sunday. The mine at Kenieoa Belle is Renison associated and this ainc has lust requested a loan of 5,000 from Government to Instel more plants Th#y intend replacing stamping mill by rolls -s they get too aadh sliming. Mr. O'Bea, the Manager, did not know much about rolls as he had newer used them but said Mt. lyle had recommended them. I asked him about wear on the rolls and he said be believed high speed rolls wore rapidly and corrugated but low speeu rolls were better. Be was Installing low speed rolls - SO* dia. x 16* face end running 2? r.p.au Be said Electrolytic Zinc at Rosebery had a couple of pairs of Allis-Chalmers rolls - high speed SO* * 14* - which needed doing up but *hich ware for svle. Re said U.e difficulty of using high speed rolls as slow speed roils was that pulleys etc. would not deliver enough power. Kt. tyl# had told him that the beat type were 'Cornish* rollu vitii <?5 5 ft ### Mg* ?> icj t ICU^Ull-DiNM/.] Si , ! ,( BARROW V MiUALCO "2- NO U44GF 1%? froix 'co *'*?*.*.r* NiiY;i v . NO 116! o:* I t high belt speed and then geared down to low roll speed. At;the old Tasm-nian Amalgamated Tin mine t Kenjinn 3elle, we inspected the air compressor and receiver that.'** iiave purchased from Mr. Howard, (Hr. Howard purchased noa t of the plant frcs this Bill.) Also -a* fifing S6x which he offered to us is installed he e. The sir compressor Is a CSS, 8| bore z 10" stroke - Brooawade Machine Ho* 58576, pressure 100 lbs* per square inch. It was driven by a 45 H.P. 1440 r.p.m. ootor (l.G.E.) S.c. the ootor is not being supplied to us. 7 Vee belts used for drive. The teachine delivered air to workings several hundred yards away through a 9* pipe* The flying fox seemed rather stcsll to me. ?he bucket was said to be ton, which for one shift per day at the sill would sean SO trips per hour. (Hodge said It had Bade 70 trips in two hours, i.e. S5 trips per hour). To operate the alii 3 shifts would mean 60 trips per hour whitrh it could not do. Visited Hcnison Associated new mining face. They commenced taking out by open cut but had about 15 feet or more overburden and considered lifting ell this to trucks and tramlng out and tipping too expensive. They have now driven a tunnel some 50 feet lower, with rise to surface and they remove the overburden and drop it through the rise into trucks below for taking to tip. Saving in coat seemed very doubtful to me. General practice at all mills I have seen and been told about la to have air compressors at the mill not at the site of workings. Healson Amalgamated have horirental L.gersoi Rand compressor roughly equivalent to our D85 and tl.oy take air about 1| miles to mine by 4* pipes. Monday, 6th_pggeBber. Telegraphed Jacques Melbourne to supply an eccentric iDUCEO IN MATTER CF HEV3V MIDAI.CO NO H6i OF 7 bush weariag.<plate tor our cruafter -s It was running without one. Also asked them whether it was practicable for us to use*an eccentric hush with only eccentricity instead, of present f* in order to get finer crushing. i The plate is to he forwarded in one week and Jacques * answered they recommended a bush with minimum of i* total .* travel eccentricity. They considered anything less.than i this would tedly reduce capacity. However, Jacques at> to enlarge npoa this in * following letter. At total -3 movement the movement of mantle will be i and this, vith good segments should enable rock to be crushed to uajglsuA. ^|iWArrived at plant about 10 a.n. but men were still liii........... ......................- ""'l1. .PiWUU.5.U . V - '''....... BAfiRCXVV MJOAl.CO NO HW m lOF .. 4) fi? Iff If* S<J2 s.a/a ft- 8 Commenced running ore through plant at 1 p.m. ' The ore was lust as excavated, 1.#. no picking was done. The jaw crusher operates very smoothly and takes readily any ore which will eater the top of the mouth. Some of the ore Is as large as 12* x 10" x C* and some as fine as 1/e* swsh. The tonnage Into the sill ia estimated by the number vf trucks brought 1a. Each truck (and tipping trucks) is called a "half ton truck* and is 3* x 35s x 24* deeps One was taken et random and the ore was bagged and weighed. The weight was 9 cwt. K quarters 14 lbs. i.e. 14 lbs. short of | ton. The ore* was damp but not really wet. It may Jiavw had $% water in it. On the above basis our ore as delivered to mill gives 2} cubic feet per ton. The drier runs very smoothly and gets very hot but no means of measuring the temperature is available. The fan o& the outlet Is out of balance on touching on one spot *nd vibrating rather badly and Mr. McRoberta is to attend to this. Ee is also to fit a butterfly valve in the outlet sta*k. In vet weather when ore is wet a high Air speed through drier can be used but on a hot dry day like Monday, t. e fan 53 5g AS f "Si3 SSp SM<.iri w1*- iw airf PROQUCLD & MA H CK tV ^4. fttODUCf.D 'N MATTER OF BAftROWV MID/U.CO KEYS V MtDALCO NO 3 MS OF l? NO lift1 OF i<*7 * cart its asbestos fibre and dust out of the drier. Wood * logs KpeJUmxt in the drier and combustion la quite good* Bormally^NShbout^i too per day (at 15/- per tea) app* jximately, delivered Ito mine, l burnt, but on vet daya this Increases ** to about:2ftons per day* Loose asbestos la the drier Is discoloured due to heat and hence *e should not alas to -g crush too fine before the drier. lh7troaael after the drier has 1* holes and rotates 2 at about 15-50 r.p.o. Approximately l/3rd of rock foes through the trosuael and by-passes the gyratory. Tht trommel runs very smoothly and gives no trouble. . The gyratory crusher runs fairly smoothly bu^ at present does a rather poor 4ob. The segments are ba.ily worn on one side and with the mantle set to touch the segments on the good side there is a minimum gap of about 1/2* on the other side. This Beans that nth the movement of the mantle there is about i$* gap on oue aide of the machine through which the rock passes. This Is aggravated by the fact that the machine is not being fed to capacity and hence is never choice fed. 11so the mantle was revolving rapidly throwing rocks around until they found the largeat opening to drop through. Be stopped the mantle revolving and diverted ail feed to the unworn .portion of the segment* and got better results but still not good. The machine needs new segments properly control and less throw* The action of the machine is good, however, as it is a cracking action and hence does not lead to excessive wear. At this atagv we should crush down to about $ I believe. La.t. Screen. Fibre is apparent at this stage but it Is not necessarily the longest fibre in the ore and it is almost invariably discoloured from the drier. If collected separately, this bad colour is very apparent but If taken in with the asbestos liberated later it cannot be noticed. pnoouco*5N matteh of BARSQWj'/ MIDALCO NO IW80F 1VS7 PRODUXD SN MATTER OF H.VJ V MIUALCO NO JI6IOF3W I: ; fta-mg this run no fibre was aspirated froa this screen < hence the screen acted sioply as a screen to resets T&is* and as a eceveyctr. < ;'Thig screen Is now:- top Deck - $ opening i- .1. \ wire} 2nd Deck. - |* holes In plate; grd Deck SO X est&aate that 0/12tha of total goes over top deck, S/lSfihsj over Ho. 2 deck, /12ths over Ko. 2 deck and l/X2th goes through No. 3 deck to tailings, of the overs froa top deck, sost material Is | or less with a snail percentage up to *i, ?ro* the screen all aaterlal except tailings goes-*: r to the belt elevator running at about 250 feet per ulnuta. Roughly Bade buckets are spaced on this about 8*-C* apart and this unit at present, llaits capacity to about t tons per hour. At least twice as many buckets are requi.ed. The elevator delivers to tbe fcubtt Hill. This does an excellent job of breaking ore and separating out the fibre but does not te3e the fibre. Very little aaserial over remains after this aaohine. The bars of this ____ o*chine are getting worn but not badly so; the llniug of the machine shows ao sign of wear. Tae oacntne is now running about $60 r.p.fc. It is proposed to try this aochlne at 1803 r.p.a. and with too extra oars fitted asking a total of 4 bars. The flywheel will .;uve to be removed to do this as otherwise the speed of this -ill be laOOO ft. per minute which is too dangerous. So. Z Screen, on to which or discharges froa che Subit Hill, is at presentj- Top Deck - i* oponing woven wirwj 2nd Deck SO ttcsh. X estlmstod that about 5/12tha of ttatvriel went over the top screen, about 6/iSth* over the .'nl deck and about 2/12ths went through the second deck to tellings. K fair quantity of fibre is aspirated froa tht 2nd Deck of Ho. 2 screen (how much in the total is impossible to estisete accurately, but probably something under l/5rd), tttt 3r fs-s li? -s6 ga i$j J*b. '<4y .5r S fri Iff . i:.-") IN MATTER OP h>akrowv msdauco i NO*S*eOFS987 -8- PRODUCED IN MATTER O' Hu'rjV MlOAl.CO ts'J Ut,: ui; J'.g7 * l&nge quantity posses over without being aspirated because-art la not sufficiently teased out. This screen appear*'to bu&tp slightly, ftt the front end which bakes It difficult* to set the hood to pick up fibre without rick, as there $Ls a tendency to bounce rock up Into the he The fact-4t hat the driving rod from the eccentric mi attached to the fsfent of this screen (whereas it is connected to 3 the back of both other screens) nay be at least a contributing cause of this bouncing particularly if the eccentric or bearing bushes are slack* Troffl So* B Screen the overs from decks Nos. 1 and 2 drop into the Torrey Cyclone running at 1440 r.p.c. This machine teases out the fibre fairly well and breaks rock down to below 1/4*. It did not do &3 well as e thought it should and after the run the hasners were examined and foui.J to be badly worn* The leading edge for about 4* from tip was very such rounded away. For to-aorrow*s ruh the Toj rey will be reversed thus bringing the unworn side of h&amers into play* The bottom bearing of this aiachine gets very hot - whether this is because of poor grease or because bearing is overloaded Is not known at present. Heat cannot get away very readily from the bearing and we may find e circulating oil system Is necosr.ary Instead of greosa. 1 think a spare race should be kept on hand. The Torrey discharges into a Trommel with 1/8* plate at* y and then a 0 mesh screen around this again. This trommel screens out a large quantity of dust, almost half the total tailings coming from this unit. The material both l.uoufh and over the 1/8* hole passes on to the Ho. 3 cr*i.. At present this screen is as follows:- Top Duck - 14 sash, Deck - BO mesh. Two aspirating hoods are fitted on this screen, one on ech deck. It is from top deck No. 3 screen that most of PRODUCED IN MATTEROF BARROW V MIDALCO NDiM&OFWS? -7 fSOOtCEO N MATTS?O Ht'Yo V MiOALCO NO iu,\of \',x reslly*g;ood fibre is obtained, although a quantity (say X/fird oi tob*l) dec*. ' fine tibf is obtain** from the lower the overs fro No. 1 deck amounting to, *ay,i/3rd of total going to the screen at present discharges <,n to Q5v*2-tr^e>gPC0ft ~*g*ug. v> y !?!fl.SS the Xisor and are shovelled back on to the belt elevator at the end of a run. It will be necessary to Instai an elevator to return this material to the Torrey as tl.e material is about 3/16" diameter and contains 8 high proportion of unteased fibre. (Actually, this material * was returned after the run end the Torrey made a very poor job on the second pass. The material was still fat;Ly large and a large quantity of fibre still remained v'.n though an extra 50 lbs. of fibre was obtained by rat ting about 1| tons of the overs from No. 5 screen back into the Torrey). The material from the second deck goes to tailings* (About g/lgths of the total on this screen) and the throughs fro* the second deck also go to tailings (about 3/luths of total). tot this run the total yield was only and the rate was about 6 tons of rock per hour. The fibre wus very clean and of-grade at l-eawt equal to 4X. The main reason for the low yield appeared to be the poor performance of the Torrey. Tuesday 7t^ Deoember. Plant ran for 5 hours - Torrey had been reverse;. All remarks made ee Monday*s,run still hold except that the Torrey now does a ouch better job. Material coming from Torrey was about half the site of yesterday and much more fibre was teased out. The material was better than after the second pass yesterday. In the oven from top deck of No. t screen, however, there is still a lot of fibre which oust be collected as It is of recoverable sire. There is ^OOUCEDlNMATTT-npF BARROW V MiDALCO NO Of`5%? FKOOuaa) SN MATTER Cf Hi-'.wV midai.co HO \YS. Of !.,,? als** ^Jkotlty of fibre going out with the aateri-l from o. S deck and with other tailings but I believe this fibre ) is too effort to warrant Its recovery unless & marhe. for short* li ^ound. e Jt;&ay be necessary to put the saterisl from dr. S screen itop deck through rolls to grind the root to powder then to trommel this through a 20 mesh trommel and return the overs through the Xorrey to tease the fibre out. Ttie yield from this nm was 4* and the fibre'-wc.s-elfean____ V~g* - /*# and although not duite as good a grade aa yesterday was still-- very close to 4K,, The more fibre recovered the 'lower will be the grade apparently, as tt is the shorter fibre on the #MJsv* whole which 1* *recovered*. The total ore to the plnt was 5 tons in five hoars, i.e, 5 tons per hour and one tou of S ?>- S3 & fibre was obtained. Saaed on the above run an approximate flowsheet of 3 tone of ore per hour is attached. A point which must be .watched is that the aepli <Un hood Bust be cut out before the screens are stopped otherwise the grit on the screens is sucked up intu the asbestos cyclone collector. >yf* -ma wvvii's0Mvmi*9 jjgy mun^r --r ^--r uOuaeusi"!*' .11tit .the lrtirM.1-- *-j$y > mtitu naya ***** *fc me Scfas*--- JLM Jr oust fit an efficient. I believe we in y^^o^J-L-La- l'.'UXX,il>lNMAn -iT.r BAfifiOWV MDAtCO NO nag or 19IS7 HOi fc <,U> tN MAITO c: Ht'OV I.:'!?.V.rO NO lit; OF I -7 --ieiiug tuUWy4i * rua t. SMiiH4u*t. With 0. I ^ A"f_ * ' A- rr*** T-- < r to Wj totmwt tHlOULMsu iMUm t thfl Bill without, e du?t *** .r^ey on ^ute, lytaiiJMiL easentifl^ f Slfeafcfci -^ntua uA liiiltm rim* jffifl it mtt ppsltlons where fine dust occurs, such as trommels, tailings, chutes, Torrey cyclone-and Kublt aill,' MMMMMMM 'uiitred duuf^iowisWf, to permit inspection when necessary and a TM--iairfif~~--it -nw fa tana *< hinged flap should he provided at the and of each tailinga chute to fit over a tailings truck when one is in position.' ZMMBBMtfMNIMlMMF ifclfrniimnrf gggm jsaim ail f.naaift>i.nn.t m. ^Tr*7 ) m`a 1 njj "into. Friday. 10th December,. 1 run was Bade on Friday after two extra hawei trs had been fitted to the Kublt Hill *ad after fitt&ag -cartar* buckets to the elevator. In one hour 5 c*t of good clean asbestos *** obtained but losses were heavy as tne plant was being fad at tne rate of about 6 tons per hour. No* screen was o*v,loaded and the aspirating hoods could not deal with the ^u^^clty of asbestos coming over the screen, also such of the fibre was insufficiently teased in the Torrey cyclone at this feed rate. Towards the end of the rua the feed was cut down to about 6 tons per hour and Xo. 2 screen and the Torrey then handled the material comfortably. The two additional bars on the Kubit Mill did not appear to wake such difference* S .U.LD1NMAtttKgP 5 MA>CO ^"^`VMATTERCF ^Vi V MjyAl.co MglOftty? 83?g> |?3> w M " *2brf JBabit Hill was then speeded up to 1800 r.p.o. od4xi'^ little over half an hour 5 cwt'of fibre w ; obtained. The quantity of tailings froa So. 2 serc-m ina*Hfd considerably thus relieving the Torrey of unnecessary work and there was very little state rial going ver Mo* 2 screen top deck. It appeared as though the Knblt was grinding about twice as finely as befo4,,, 2t still did not tease out the fibre in the way the Torrey does, however, and consequently such unteaaeu fibre sent over into the Torrey. This does not satvcr as the Torrey does not cut up the fibre. The runs on Friday were too short to get reliable figures but the plant will run all day Saturday. However, it appeared that a rate of, say, 7 tons per hour and a yield of 4% fibre could probably be maintained, thus giving, say, 2 to fij tons of fibre per day or, aay, SCO tons per annus. I^gg. Kr. BcBobfirts and Hr. Bodge believe the drier will not dry the ore in wet winter weather without previous drainage fend atoospherlc drying. This means we may have to have, say, a veelcs storage at sill and hence more than a hopper at the crusher is necessary. If we build a long hopper or drying shed on thu spur ve arust then feed the Jaw crusher by conveyer and if this hopper is in line with the building it will not be the right ang^e for a flying fox. It appears, therefore, that we will need eventually a long hopper running at right angles to building; a conveyor over this to distribute ore as it is delivered fro* a flying fox; a conveyor beneath the bin to deliver to the jaw crusher. AS the ore is variable, in order to keep a constant grade of asbestos it may even be necessary for the hopper to be divided Into sections, esch to take a different grnd* ore - fl. PRODUCED SNV.yv BARROlVV NO IJ48 0F 1987 ^^ODtXTF.Q (N MATTER C# H'-V3V HJDALCO NO i J6i Of L,,/ as is sine*, with the object of mixing these on the conveyor belt s required* The quality of the ore oh the spur appears to ae to be generally equivalent to the ore else-where on ,,na hill and there is no reason, therefore, why we should not take off tbe to? of the whole spur at least to .no level-of the roadway at this point. .After further inspection, Z doubt whether ther<. is any need to worry auch about commencing mining at No. S ' tonnel - we could just as easily commence at the slve of the No. 1 tunnel although we should still put in'* ,,rsa line to Vo. tunnel for the purpose of disposing ci barren rook. Alternatively, a good spot for dispose. I of barren rock is the side of our spur nearest to the railway tunnel and by running the conveyor mentioned above beyond the bla, waste rock could be brought down by flying fox, conveyed out past the hopper and shot down the hillside. UiliBM* KcRobert* and Bodge suggest that to save *at.nu' involved in carting tailings to dumps (two men per d *y when on full capacity) we could sluice tailings to dump. This oul& also involve use of 'large quantity of water# of course. Air CoSB.ges.sor, It is proposed to instal the D85 air compressor and receiver at the side of the mill building nearest roadway and near the lower entrance to the mill. Air will then he token to the workings by 2* pipeline. Mill, to increase the capacity of the mill end cut down losses, further plant which should be Installed is*After Gyratory crusher, fit a trommel- to by-pass material under 1/4* and put remainder through Cubit kill. After Sublt kill put a trowel to take out all dust and put remainder over aspirated screen. No. I screen wouJJjto PWOLKXJ. U ^ MA.H s BARROW V MIDAlCO NO JlBOP i9S? -12- FROIXCCiL^N MA ITER OF HuYJV MICJALCO NO M6I OF l`M7 to this position, :TrB tfte screen the material would go to a t and the remainder goes to & screen for a spiriting fibre. The present No* 2 screen could be In this position, the reoailhder of plant up to No* S screen could reaain, but afte^ No. 3 screen, overs would go to rolls, then to troBtfel to reeove all fine grit and dust and then back Into Torrey cyclone. Mining Costs to date. Costs to date on rock on spur are as follow#:- There Is approximately IS,000 tons to be excavated. First S00 tons cost 200 on day wages a:*.d with expense of. removing overburden etc. Nov men are on $/- per ton (plus, say, 6d cost to us for air.) Hence, total cost 1200 tons S 3/6 420<-/- plus 500 tons (Total euoo/- cost -200) 1500 ** 820U/^ 5/6 par ton approxirsa toly. l2d^ Wood is cut oxl contract for ft/- per ton BO cubic feet. In addition 1/6 per cord ( 128 cubic feet) is paid to Forrestry Coaal.;sion. Ur. KcBoberts estimates wood costs ua 15/- per ton delivered at aill. In fine weather about 1 ton per day is burnt in drier. In wat weatner about ft tons per day is used in drier. Labour. Mr. Bodge receives 7.17. 6 per week (25/- per day plus 1 retaining fee and has no particular status but is accepted as secoad-io-charge by the sea. Mr. Me Huberts thinks we should definitely sake hi* sacond-ln-charge and ou0Fi5Sr PRCcrr:.-' v m* Hi-.Yi.V MilIAte no lift! Of 17 2 T3 * gaw m Eu.* sJe rec*s W*aT: M Bst &]T? '. ;gbe next highest paid man is Tonkin a carpenter aadfTtttjr who receives ?. 14. 6 and who was originally giwe&**ls on being In charge of Z carpenters. Next | highest 'is Bob Clark wt\o gets 6. 2. - par week anJ is claaaF?ed, X believe, as a truck driver in order to give hinahlfe rate. Be is a valuable sen and It would pa/ us i to give hie more. McRaberts suggests calling him Kill Foresail and paying Mm, say, 6. 17. per week. ^ the basic- industry wage is 4. xi, - plus V- per *" * week war loading. -- -tt-tV hi^i'-ii:ji ,, , *' 'v--^- * *' ___ Other classifications in the mill will be as far-*#ii-asv.w~ 'io r X can sees- Jaw erushei* attendant, Drier attendant {to be understood to do other work when not stoking drier), operator to attend to screens, elevators and other equipment (one wan). Tailings truck uan (probably two soon), Aibeatos bagger (one nan). At present the sen on tailings also bag and it would be handy to keep these two jobs e^ual pay. Mr. Mcfloberts is to forward copies of all relevant awards to Head office as soon as possible. Other classifications such as diners, flying fox operator, etc., are already covered by award to which Mr. MeRoberts Is working. Mr. McRoberts would like to pay 8/- margin to crusher attendant, drier attendant and mill hand, and 5/6 margin to bagger and tailings man. The following samples have been collected for forwarding to Sydney*- Ore Sample ) >2aae truck Ore Sample ) Over So. 1 Top deck Over No. 1 Second deck Over Ho. 1 third deck_____ _ Over Ho. 8 Top Deck marked * IS fcs So 4S S3 es Wf HaX0 SNMATTCftOF bXrRC&V v MiDAlCO Noaiaso? wm -14- flavor Bo. Second Deck 0vser So. S second deck Sailings from Ho. 8 0er So. 3 Top Deck ** before reversing Torres er No. 3 Top Deck after reversing Torrey sarkld mooi.c:T> vvp-w HE'fSV i^iDALCO NO li(l OF 78 83 88 103 ns T3 fs& fpci.'(,oC8OcpQn gW Wfi UU". S<^2 C<0 k= .15 <J2- . -o ft O Ilf Water Supply. The possibilities in this regard nret(1) Puap from Selba Creek whore it crosses Uu* Zeehan Henlson Belle road. This is a distance of about V mile and the creek Is about 4U0 fee* 'below Bill lwol (2) fhese the olti East Bundsa tramway and the transataaion line intersect, well up Ixi the hills, *elba Creek is still running *uite strongly and the E&at Uinda* tramway alaost ferns * daa at thin point. To puap from here would mean about the s.,b distance as before but there would be much less head. The actual height is not known at present. (8) The argent River in front of So. fi tunad. is a possibility but is very inaccessible and has been knim to dry up in Summer. (4) 4 further possibility would be to construct a 15 ft. dej# between our spur and the Renlson Belle R.*d. This would entrap water frost the catchment formed by our main hill and the flat in front of the mill. The main objection to this is that we wish to fill tnis area with tailings eventually. 1'^TMtU w OF BAhRQw v MfDAlCO NO ]]48 OF 196? -15- PLCUX!5>W MATTER C Hl'( ..,:DAiCO NO |J6I OF mi & n*. go* , Mr*f HeRooerts and l visited the Mt. Lyle Co. o I Thunsdey 9th LeeenDer. Mr. Hurray, General Manager was ill-la^ we saw Hr. Kaline, General Superintendent, Mr, Jafrins, Mining Superintendent, Mr. Barclay who is apparently Mr. Jakins assistant, Mr. Duff whose position is not quite clear but who nas taken Mr. Robinson's place apparently (Mr. Robinson died soae six weeks ago) sju. a number of other officers of the Company. All officers . were most friendly and cooperative. Ur. Hallne said he had a brother in tne C.SH. Co. Ltd. many years ago who was manager at Barwood Mill. We questioned Mr. Maiine concerning the best type of truck for our mining operations and he recommended the "Bavkoia* 1 cubic yard side tipping truck, *-G gauge, and he uud* plans of this track available to us. He also said he could sell us a couple of doten wheels for this type if we found it difficult to obtain them. Me. Lyle Co. make their own trucks and Mr. Mallne said that in normal times they would be quite willing to make soma for u but he could tvo. offer to do so et present due to material and staff shorta.es. This truck weights 12$ cwt. and cost 52 each to sake in Mb. Lyle Workshops* X told Ur. Maline we would shortly have to renew the IA segments in our Mo. Jacques gyratory crusher and as we had no experience In this work we would welcome any assistance he could offer us. Me offered to make a man available to us who was used to this work Immediately we were ready to fit the new segments. Mr. Jakins hod visited the site of our asbestos mill but said that ha had not considered the best methods of mining. Ee said, however, that it had crossed his mind that for mining on a fairly large scale It would be Y i ;:ixn *u u in mani i< o 15A!\icOWV MlOALCX) NO U48 Of l7 .16. FKOf: ' R.\ 't MJUALCO NO N6{ OF jyy? poywttflft to drire a shaft lato the bill almost at mill 1e*eV$rise to the surface In the hill and then excavate aadrfcMp rook down the rise to trucks la the drive. Barclay took ua up to West Lyle to see the open cut voa-k after Ur. JJaline had explained the whole of the workings to us on a sodel 100 feet to 1* cade of t.ocd. ^ x.-rtr... >. the .wdel Is corrected each year. 4it West Lyle seme 6000 tons of rock per d&y is being excavated. Host of this is Billable rock containing 0.6 . . .1.... to 1.1$ ore hut a percentage is barren rock whlehnusedv""''' to font roads around the hillside. Ill roads ape well " w made, bitumen sealed and a minimum width of about 20 feet. There are three main benches each about 50 feat high and a further bench sunk 80 feet belo* the ordinary working level. To take out material from this lower bench instead of hoisting the material, a 24 ft. tunnel has been cut Into the bench from lower doan the hillside and the ore :a taken out through this by lorry. - For blasting, holes are drilled up to 20 feet deepg* but 20 feet is most common and these are charged with A.W.t 50 . polar gelignite. Monobel had been used following ioeomaendatict by Mr. Edwards of I.C.X. but Mb. Lyle could find no advantages P ro d d e d to Asbestos Personal tnjury Cases: Abrams lead and copied lo Richard F. Scruggs and have reverted to gelignite. Ill holes ail over the workings ere shot at the one time, usually at a change of shift or at crib time and three minutes before firing a siren walls end continues to wail until ail shots have been fired. Material that has been blasted out is lifted by mechanical shovels (mostly si cubic yard Harman typo) and placed in 16 and 20 ton trucks. Any rocks larger than 2-0 are drilled again and pop shots put In to break lut^ up. the reason for this is that the maximum site rocs the rail trucks running to the mill can discharge is 2-Q. S2S,T.i'. tfXXXX.IL> ttiMATTtRO* BARROW V MEDALCO' NO 1148 Of J987 -17- There are about 9 mechanical shovels, these being 4 ** Sj cubic yard, 5-8 cubic yard,. 1 - cubic yard and X - 1/3rd cubic yard* About hall of the* are diesel driven and the remainder are electric driven and cables have to be run to these. When blasting soae of the rock Is scattered fairly widely and to save the time of the mechanical shovels, a bulldozer is used to push all the pieces bo a comaon dump on each bench* -- -------- dome, of the-14 and**0'ttfanorrfesar* Leylands which have not given very good service and the remaindbr <*lch are Poden* with Gardner Engines have given wonderful service, ill trucks (9 total) are fitted with seal-trailers. The lorry has two front wheels, four back wheels and the trailer has two sets of four wheels. The chassis as imported were too light in every case and Kt, Lyle now makes all tuelr own chassis from channel iron. The truck bodies which are exceptionally sturdy ere made by Peters Bros., Sydney. The lorries discharge into a vertical shaft abo it 8*-0* disaster which has a conical top soae bo feet in disaster. The top portion of this shaft Is about lOo feet deep`.and Gals, together with the 50 feet diameter cone, constitutes a storage hopper. At this level the ore Is regulated to fall a farther 800 feet as required, into railway trucks (10 tons with discharge doors at each side of the bottom). This shaft is never allowed to fill up as if a blockage occured it would be almost impossible to free It. me discharge froa the BOO feet shaft into the trucks is controlled by a curtain of heavy chains which is moved away from or In front of the discharge opening as required by means of a motor* All tools, excavating equipment, lorries etc., are fully maintained and repaired'by the Kt. Lyle Co* at PKOfXXTtD tN MaHU' i *t BARROW V M!DA1C0 NOJH80F JW -18- P^tOOUCEDNMA '^5 V <.<.`0 *0 i ifil OF i tasfeXiyle, and an extraordinarily complete stock of spare pert*-.'for such equipment la kept, is new part* are hard toW nowadays, however, Mfc> Lyle ties also made a speciality of srJoiltloaing and Hr. Bakins told me that out of every i i jtpasp# pert# no* issued from the store for replaces^.t, t*o are yeconditioned units. For deep drilling, It. Lyle uses detachable uiis, but . for popping and for shallow drilling, steels are still used. Mr. Barclay considered detachable bits were not economical for drilling: shallow holes as the hole was invariably bigger than could be drilled with a steel and the tendency than vaa to use too such explosive. The bits were originally re-sharpened on a cold grinding machine but this has been replaced by the hot milling process. too much metal had to be ground off the worn bits wi A the cold grinding and often only 3 or 4 uses were obtained from They now average 9 uses per bit. a bit. /Kt. tyle offered to sharpen bits for us, if we commenced using then, at 3d per bit and also agreed to . r recondition the shank of soma of our existing steels. The total cost of excavating rock at West tyle (including, X believe, maintenance, depreciation on equipment, overhead etc.) was given to me by Mr. Maline as 3/6 per ton. He said this was far too higli and he fully believed that after the war when he eould obtain adequate equipment for the work that he vould be able to reduce this greatly. The locker rooms at St. Lyle are fitted with lockers B'-C* x*p* deep and approximately 4*-0 from seat height to top of looker. The door opens lust above seat height and a teat runs along the front of all lockers* Eacu pair of lockers Is fitted with a 1/3 K.W. electric heater 4t Uie bottom for drying clothes, and ventilation is proviso in the locker top. This heat which can hardly be felt in each <>' < locker g# sufficient to dry the miners* clothe* in 6 nour*. rcoixT.t) in MAinnof' HARROW V MIOALCO NO i 148 OF I9S7 Wcaxrcr^.^MArr HVS V MttMiC NO M610F J9y Produced in Asbestos Personal injury Gases; Abrams lead and copied to Richard F, Scruggs ~7+///g: frtre Yf*/J~ m - C-T# * ***** % 4* a $ 4`lV x/* *. .rfV *y ^ 7~fac. -2- ' * .`UATTEftCF lx- s' Mr0ALCO NO miOF 1987 possible hold ups I *ill arrange for one addition:.! sot of hammers for the Torrey to be sent to you (coated with Fitwell alloy) but all other item* should cither be ordered direct by you or a requisition forwarded to us. Xou wlii doubtless consider that a number of tsachlaca and hand tools, bearings, and other items say be necessary in order to guard against breakdowns and a list of such items should be forwarded for our approval* Other~30br which~*e agreed should be carriedjjutTkre s* --------- (1) B*hahtrfan--iro drier retires attention--------- : " *" to prevent vibration. (2) Exhaust Fan stack to have damper fitted* (2) Erect D22 iir Compressor and receiver alongside Mill Building (In this connection Z will purchase for you a 45 H.P. motor) (4) Handrails to be erected as time end labour permit, this vill serve to make plant staging*, access stairway, etc., safer than at present. (5) Hew bottom eccentric bearing with |* eccentricity to be ordered from Jacr.ues by you. is regards water supply both for drills and for drenching purposes, three main items of information are rcquiredt(1) Height from Melba Creek at road to Mill. (2) Height from Melba Creek at East Dundas Tramway Transmission line intersection. (5) Rough contour of our own valley where dam was proposed. In addition, of course, if any alternative schemes are brought to light, information on these Till be necessary.