Document nmbNoOZ1Y41R6Lb0ykmZ7BOXX

AtSi JtlOs S'OBVSX A? COLORHO. CKE AOS-ERALIAS 8LU ASBESTOS LTD- f wm&IOOH on 17-19til Beresber, 1$Oi. During the 17,16 sad 19tb Bovesher 196b. an air flaw survey of the underground workings of tbe Colonial Vine, Wittertoaa was carried eat hr tieftbere of this Department. Tbe result* of this surrey, together with 09 observations are recorded bole*. , ,, Tbe effective Intake into tbe underground working* ccrteivts of 36,000 ountne being drawn into the bain, adit under the influence f 2 x 60* Richardson axial flow fans, wozklng in parallel. Sm obtest or this is to Ore* the sir daws the main adit to the Boo. 5,6*?,8 and 9 service rises where it la upeasteO te the sain levels and thence up Into the Bos. 6,7 end 0 level steeas before being exhausted thru* either of tbe two Abase* fane, case of which le installed in 5*9 end the ether et fia.56. Ventilation doors ere installed in all the turnouts off the adit, to tbe Bo. 9 level turnout, to prevent air being drawn off at these points. However, dee to ineffective wealing of the doom, there .la seas.leak*** et these points. .. f*g. X Ifttl Intake to the Be. $ level off tbe Vain Mil ooaeiets of 4.000 canine. This flew is upcast to tbe upper secs wortcinga thro' the Bos. 50, 316 and 528 Usbmitb. There is also a Teonas of aperexlmtelr 3,000 cuain* eaters tbs Bo. 5 level thiu* the door in the Be. 3 sdlt below the Bo. 4 level. This la drawn in thru* tbs Be. U level adit M is upcast to tbe leper sea* workings * thru' Bo. 50s K/wsy. PVt.,6 2ml The intake into this level scnals*# of 14,500 chains upcast fraa the asia edit, plus 5,000 cuaina famit frera the upper seas workings thru1 the 6l - 62*3 M/wayw. both of these feolunasa are Irvltifcd slider the influence of e 16" .P. situated at tbe top of tbe Bo. 6 level Service Rise, All of this elr Is opcastod to tbe upper ween workings thru1 the Berth end Borth Vest Kanvays. There le also 3,COG cumin* of air downeasting thru* Bo. 63S seaway to Be. 6 level which flews south under the . influence of the Bain sxhsost Pane. Shi* Is Increased to anrc&iastely 10,000 tnrnins by further dosneastlng thru* the Bos. 60S, 698 and 6108 massy* and 1* drown thru* the two ventilation doers, la the 6118 area to the ataln exhaust ran*. the Pff, 7 1ml The aacunt of sir entering tbe Bo. 7 level cons lets of 10.000 canine upcast thxu tbs service rise freo the sala edit, plus 1,000 cuisine dowfecsst thru the 718 massy and 2000 eunlns downeast thru the Bo. 70 Usovs? from the upper sees worklnga. flow again passes Berth m4. is dispersed tapmrta threi the Rorth and Berth West ttanweys into the upper sees workings } i : i * 1 VW-004256 2 *M Thar* la also a downesat flc* of 9*000 cumins from tfca 73S and 743 manways which gees went tana the No. 3 adit eul 3Ijib the now to the main exhaust fans fraa No. 6 level. ga^tUml =*' A volume of 4,000 cumin* 1* tpcaatsd froa tfcn sain edit thru* the service rise, this la Joined by a fio* of 2,000 eusuia cooing qd the No. adit from Ho. 9 leval and the coafelnad volume of 6,000 cumins nova smith to the Ho. 3 edit feeing added to to* a strong downcast flea of 2,000 cumin* trxta the filS mass*? end 2,000 cumin* from the 62fl samray making a total of U~12000 ctiiKlm at the function of the No. 3 adit share it Joins a flev of 3,5000 coiains up tha No. 5 adit tfeoa 9 level. At this Junetore those ia approximately 30?55000 cumins floe sooth along 8 level tewerte So. 5 adit, and tfcda *- <total la made up from the following It Sbtaring No. 6 level via No, 3 edit free 7 level 10,000 caslhA. a No. * * No. 3 " free 9 level w 4,000 csmlds. Booth along 8 level from north of Bo. 3 adit 12,000 cumins. Downcast to 6 level free 638 manway 6,000 nrroln*. Approx. ~ 32,000 olat, Tha tixm along So, 6 level la also boosted a* fey the time It reaohe* So, 5 edit fey further domaetlog from tto.spp**^ seaairozfelnge thru* No. 648 iwwway (approc. 13,000 cumins) sad Ko. 638 ewawey <7,000 cumins). This fin* la then exhausted to the So. 9 adit to So* 7 level there It la Joined fey a further flow of approximately 8,000 cumins, which It leading thru* the ventilation doors % 7 level. There is also a vary stress leakage downcast to the r 7 level thru* tha Noe. 768 end 788 nssmaya end tbs alrflov entering the adit at 790 cm 7 level has fees built up from approximately 60,000 cumins to approximately 90.000 cumins. At the Jmetlon with ko. 6 level, the main tlra Is Joined fey a strong leakage thru* the ventilation door* on No. 6 level an* then the floe la split xnaiar the influence of the two asin cxhsrcut fans. 60,000 e&sdne ere exbaneted to the aorftee thru* the 60" Slchaidam axial flow tm situated at %a on 5 level, whilst the remaining 35,000 cumins la exhausted south slang Bo. 6 level thru* the 60* Sichardaen axial fioa fan situated la the south drive. The flow aleeg 6 level builds up to approximately 42,000 cumins fey the time it reaches the fan dao to further dcencaetihg thru* the brattices een the snnwaya In the 6 level south drive, there is also recirculation of seme 11,000 cumins thru' .the CRhsoet fen dua to the leakage thru* the brattice in the drive alongside the fan, making a total fan output of approximately 53.000 cumins. Nesutts md Cg>r3Blst The results of this alrflo* show that there la a considerable amount of ahort-drcultUng or air'through the 'tan exhaust fans. The measured volume'or sir altering the mine, ssd hence ventilating the waiting*, it 36,000 cumins. Whereas the total volume of air measured as passing thru* the two exhaust fans is 103.0<Xj cumins, made up from -- Nia) - \at thru* fan at 943 a 60,000 cumins ^ net thru* fan at feel Beath .Drive m S3Pgj canine. 1 } < 3 ' "R&S' this afcort-circuiled air enters the upper &* workings froa the openings to the cliff t*oe at tbs Boa, 2,2 sod 3 levels, hsre it can be aeen that the brattices, which were previously in position la those section*. h*e since bean blown out. There la eleo a possible entry point near section 1ZB. The air entering from the allff face ferres dovn thrcugh the eld upper aaaa working* to the See. 6 and ? levels and flows directly to t&e tv zh*5et fans, vantilatiny vary for of the current Tasking places enroots. On en effective basis therefore, it an easily be aeen that If the Metered valnte of the tee . exhaust ftma Is 103,000 emnlna, whilst the ataeured intake thru* Usb sain adit la only 36,000 cumins, the exhaust fans axe theoretically * orbing with an efflolaacy of only 3 effective airflow, based cb the feet that the cnly effective airflow Is that which la Ventilating the workings via the aalu edit. ? overcnoe this and to increase the Intake thru* the_ gain edit it will first he necessary to effectively aeal off ell openings around the cliff face eeueed by the recent osve in. To date a prcgrem of brattlclag in the old wefttlnga and installation or ventllstlctt doors on the levels has been carried out. hut the pressures exerted on these brattice* ui doors by the airflow# entering the aid workings has ml11.fiad. this programs to e great extent. &irlmg the course of our airflow survey, *e aeaaured volumes of op to 10,000 canine passing thru* these ventilation doers, end also volomfi of up to >4,003 eaaln*. leaking thru* eoete of the brattices. If the elifr face,could be brettlesd off than the brattices and doefire already installed should be capable of doing the 3b they were Intended for. It was ala apparent, fro* our survey, that the nrlaery airflow asst be altered to iarwvw the flee tfexv* the northern aectlcna of tie nlss. SecptatwawSatlmni (1) Openings to diff faces to be affectively sealed. night reijuiro timber or concrete bulks. this (2) VentHatim door In the Ho. 3 adit, Just above So. 5 level, should be re-hlnged ae that the door pens upwards cb the top aids of the doorway. (3) Ccapreaaod air-cyllndar control jec&n to be installed os ventilation doors on Ho. 6 level to facilitate correct opening and closing of doors by truedeere, (U) All ventilation doora and brattices already In poeittm to bo rsasBdl Sinned and reseated. (3) largo fs to be installed on north aide of Bine eorfcings, preferably on He. 6. or when acre etches are eoanseted between the Ho. 6 level and Ho. 9 level, an So. 9 level, to increase the volume of (dr being distributed throughout this section of the workings. (6) Consideration be given to the ecsAtruetlan of a ventilation abaft to oooe between tha Ho. Q . Ho. 9 levels and lost outside the northern are Units. Thia abaft in going to be essential in the future when the mine la deepened down towards Hob. Id and 21 level*. Ventilation ocamvetlone oan be-Bade to this abaft Jfeor the atope seeks with small drives at necessary Intervals, aai alto froB the levels themaelves. It tan be expected that the section of the Bins shorn 7 level will be worked out within e fwr years ami there la also the possibility of farther eollspaee to be ecBBldered In the area of Ho. 6 level, therefore it would be adrlaable to atari planning *ud a ventilation, abaft immediately. ______ Under the present prloary airfine syrteo, there U kq insuffteSent volune of 4r ventil* tine the northern sect ten of the workings and with both cshaoet fans so closely positioned to eecit other in the south section cf the Bine, the primary airflow ic landing to be unbalanced. therefore, that is shy l cemider that the latsediete installation of e Jrd primary eir Ten in the northern section, followed at a later stage by the coastruction of a nee Ventilation abaft, is necessary. This would provide a very simple loyoat for two possible primary airflows. The osin intake down tta main edit, bsirts drawn off froa the lower sections of the worsting* and two exhaust airway* dno la the south and one in the north. A tan, similar la else to the type already installed st 5fcS nS 6 level south drive, would be sufficient for the new installation. - - ' (TSBtUstlCBi) State Mining Ingineer, Hines Qep-artaent, Forwarded for your information. SBHIOR IMSBCKW OF tf^gS