Document kDzazEMzN0akg6VnXK7vbw1vy

MDflJTES _QF PRELIMHAHI DISCUSSIOH 01 EXPAISIO* PROGRAM Australian Blue Asbestos Limited Western Australia Pr.ESENTt A. R. Fisher, G. K. Foster, C. W. R. Powell, K. C. King, C. D Horror, R. A. Denovan, X. V. Lindell Mining Method It was generally agreed that the present method of mining was both inadequate and costly, and that a change in method was necessary in order to obtain larger tonnage for production as well as to decrease the mining cost. . The present tonnage is all obtained from development driving or one free face blasting. It was agreed that for preliminary purposes a long- vall method of mining in 500-foot panels, backfilling mined out area for both support and waste disposal, should be th" e basis**, f*o` 4r i*initial disouesions. The practicability of opening up large areas supported by backfill is to be determined by trial* This question arises x'rom the fact that the capping is a hard ferruginous quartsite or ironstone with numerous horizontal partings 400 feet in height. It has been thought that opening large areas would result in the capping failing at the working face where the unsupported roof would be cantilevered. In any event pillars may be left at intervals to control the size of falls and subsidence, and still obtain a considerably larger tonnage extraction per foot of preliminary development than the present method. Drilling ' It is proposed to use aual jib drill carriages mounted on pneumatic tires for all drilling. One type to tie dual jibs mounted in pairs at front end of carriage for development driving, and the other type to be -2 - dual jibs tandfah mounted for longwall drilling^ '.*.<! 5' ' i yV~ ,y *:/ ) drilled in advance^ depth of out to be determined by trial* Present drilling has all been done by the conventional forged drill steel* Considerable difficulty has been experienced in maintaining the gauge on drill bits with attendant'loss of drilling speed and requiring many steel elaagpfr Use of detachable bits which can be unifoxally heat' treated for-the required conditions, should be studied* This will also involve the study of the dpsign^cf the bit f^c^best results in this ground. >*c^ Blasting *" . ' '- . \ *;W ,.. . ' Was'* te-rock will be blasted in sections t. of a- si.we*i^*O* *.b.*det*ra` >ine> d' ~. >* .. on the job to obtain leastoverbreakand lossofore. ` ;:r"` Ore tobe blastedfrom-the: bottom aft ^stf red?ed*; This method^ will obtain larger tonnagerat a working: face fdr WsVdf^ . - * *. .*'*' ,*' -. . ' ' . ' . , * v conditions? with. mechanical equlp^ni?rfaoingfiMi4iuc^ reducing^bbstilfr." ^ +\ V".--y V^: "' ' - 3 ' '' ' ' , v .' - .. . ^ ~ `-; *! v? Waste Handling ' ''* ' "' * \/ ' Waste'to;lb*'used for backfilling ained. dieselIbulldoser. or equivalent. Benoit to be deanedx by'hand shovelling: ''' - . ' and backfills to the roof finished by hand/ shovelling^Thls^aUainatw? < . hauling waste out of the aine. '' ' ' will wank or Ore Loading ". _ f.,'. .. 5* s. . " ' "".'"A : * ' A scraper loader of the air hoist* scraper and reap type will be used for loading into low oars operated on' traok with30^1b.rail end - steel ties*. Loading will be facilitated by. use of 3-ton battery locomo- % a , "" ` : tivee and switching cars:te face by ,using Qalifontiq^typs^portahle- switch Other methods were dismissed, such an . 1* Joy Loaders 2. Shuttle Cars 3* Shaker Conveyors and Duckbills 4* Scraping to Loner Seam It was agreed that these alternatives all had merit but that for preliminary purposes in order to obtain higher production at the earliest date with a proven method, scraper loading into cars should be used for the basis of estimates* Prior discussion on this subject brought out that two Joy loaders and three shuttle cars are presently on order* With the longwall method proposed, the Joy loader would be required to load one-half ton per minute against its rated capacity of eight tons per minute to handle the hourly output of 31 tons mill ore required for 10,000 ton fibre schedule* One shuttle oar (10-ton capacity) would need to make 3 trips per hour to service the loader* Trial of this equipment will determine their desira bility and the economics of their operation* As this proposed method of mining lends itself verywell to mechanisation, it was generally agreed- V ', that a method eliminating use of tracks at the working face was desirable* \1 ' ` Haulage The two 6-ton diesel locomotives presently on the job would be-used for haulage to the mill. Power Supply The present power supply is inadequate for the increased tonnage* It is proposed to purchase two 2,800 c.f.m. air compressors to- increase the air supply and larger lines to the mine will be required* Compressors to ee installed at the present mill site* It was generally agreed xhat it was daairable to generate, all power at one location in preferably two large units, instead of operating many smaller units for generating power or driving compressors* This decreases maintenance costs as well as requiring fewer attendants. A new power plant for 2,290 Kw., building and power line will oe necessary, at a new location one mile from the mill. No allowance was made for increase to water supply. Ghangehouse, Shops. Stores. Etc. Additional capacity has been allowed. Tailing Disposal . It is proposed to build one mile of new road to a tailings dump at a new site. A 10-ton truck is proposed for this work. Mill Equipment and Building "i -* This phase of the operation will be discussed in a separate report* :7a would record here, however, that' it is desirable to make immediate additions to the present-mill using equipment proposed by Johns-Manville. engineers, both to provide additional capacity to keep pace with the mine as well as to permit testing suitability of the proposed new equipment for the Australian ore. Further study will be required to determine the economics of pushing the main haulage underground, through the peninsula, to`the adjacent gorge anc. erecting the new complete mill in a more central location in respect to the future mining. . /LCG November 19, 1943 lining Equipment COST ESTHATX 2 - 2750 F/M Compressor* 40 Drifters 13 Jumbos 20001 - 6" Pipe 3000* - 4* Pipe 5 Slusher Units 4 - 3Ton Battery Locos* 3 Spare Batteries Rectifier Equipt. 30 Cars 3 Bulldozers . Fans & Auxiliary Blowers Power line & Transformers TOTAL.MINING..................................... $60,000.00 40,000.00 54,000.00 3,000.00 9,000.00 17,500.00 16,000.00 3,500.00 3,000.00 24,000.00 12,000.00 10,000.00 Power & Miscellaneous Power Plant 5 500K.W. Units Inst* 500,000.00 Power, line & Transformers 110,000.00 Power House with Crane 50,000.00 Compressor House 20,000.00 Shop,Stores office etc* Bldgs* 150,000.00 J Change House " 20,000.00 Tailings Disposal _ 25.000.00 TOTAL POWER .& MISCELLANEOUS........ .. $875,000.00 ' WilliTiff Milling Equipment Mill Bldg. Dust Collection St Miscellaneous TOTAL MILL 239,000.00 128,000.00 _143.0Q0.00$510,000.00 GRAND TOTAL Mine Equipment Power & Miscellaneous Mill Total $297,000.00 875.000.00 510.000.00 GRAND TOTAL.......................... $1,682,000.00 /HOI November 19, 1948 ..... Probable Delivery 3 nos. 1 mo. 4~6 mos. 7 7 4-6 oos. 6 mo*. 6 BOS. 6 oos. Australia 6-8 sos. 4-6 bos'. ' 12- mos. 3 BOS. 12 BOS. _ * '_ 2 Coipriwri.............. ............... .......... .............................. .. 1000 H.P Fan* & Blflmn............... ............................................................ 100 " Sluahers.................................... ............... ...................... 250 * Main Haulage Locos.................................................... 200 * 4 Gathering Locos................. 100 2 Jay Loader*.....50 9 3 Shuttle Cars............................ 60 * Mill Connected Load............. 1760 1300 * TOTAL CONNECTED LOAD....................................................................... 3060 11 Diversity Factor 0.8........................ 8056 Efficancy 5 500 K.V. units required. 2450 * ' 1830 K.V, 2290 " /EMI November 19, 1948 BASIC ASSUMPTIONS Operating days per week...................... Operating days per year........................ Kins shifts per day............. . mil shifts per day................. Short tons Fibre required per year*. Short tons Fibre required per day... Short tons Mill Ore per day.. Short tons Mill Ore per mine shift.. Short tons waste rock per day....... Short tons Waste Rock per mine shift Short tons Total Rock per day........ ... Short tons Total Rock per mine shift Short tons Mill Ore per Mill shift. Short tons Mill Ore per mill hour..., Specific Gravity of Rock............... . % Fibre in Mill Ore............. . % Fibre in Mill Feed................. % Rock removed on Picking belt......... /EMM November 19, 1948 5 250 2 3 10,000 40 500 __ 250 750^ 375 1250 y 625 167 21 3.4 8% 9.5 . 15.6 V I START,. COPY BOX NO./FILE DRAWER NO. 9 SIGNIFICANT , NOTES quSl - INITIALS DATE SEGMENT NO. '