complex in arizona installed - mmd groupputer simulation which resulted in a truck and shovel...
TRANSCRIPT
In 1997, Asarco�s MissionComplex in Arizona installedwhat is potentially the worldslargest crushing facility as thekey to the mine�s waste trans-port system. This comprisestwo complete Sizer Stationseach with MMD 1500 SeriesMineral Sizer, MMD D9Heavy Duty Apron PlateFeeder in a Natural Groundhopper. Prior to this, the mineoperation had been analysed using Modular Mining�s Dispatch com-puter simulation which resulted in a truck and shovel requirementbeing established for the life of the mine, approximately 24 years.
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AASSAARRCCOOTTUUCCSSOONN AARRIIZZOONNAA
Mission complex
54 cubic yard Shovelloading 240 ton truck
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PPrroobblleemm aanndd SSoolluuttiioonn
SShhoorrtt hhaauull ttrruucckk aanndd sshhoovveell rreettaaiinnss fflleexxiibbiilliittyy ::--Truck numbers can be reduced by approximately 90%Long haul by conveyor halves the mineral transport costs becauseelevating the tearweight of the trucks is eliminated.
TThhee MMMMDD NNaattuurraall GGrroouunndd HHooppppeerr FFeeeeddeerr uusseess tthheemmiinneerraall aass tthhee dduummpp hhooppppeerr ::--Eliminates civil costs, absorbs tipping forces, eliminates wear costs,reduces power consumption, with minimum re-location time and cost.
WWiitthh tthhee MMMMDD SSiizzeerr ccoonncceepptt ::--Volumes well in excess of 10,000tph can be sized accurately, withminimum power and maintenance costs. The Sizer, acts like arevolving screen, passing undersize material whilst breakingthe oversize material to the nominal product size required.
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This new system assisted in Mission�s goal to lower production expen-diture through overcoming the factors of deeper pits and higher over-burden to ore ratios that would increase costs. Mission�s MMD 1500Series Twin Shaft Sizers were designed for a maximum rock size of 3.0x 3.0 Metres with each of the two units having a production capacity of10,000 tph and the ability to produce a conveyable product of 350mm.While the true capacity of the machines has proved to be well in excessof this, the system is restricted to 8,600 tph by the conveyor belt capac-ity. Each of the two Heavy Duty Apron Plate Feeders manufactured byMMD is located in a Natural Ground Hopper developed in a benchhighwall such that two 240 ton trucks can dump simultaneously fromthe bench above. The sized material is then taken away by a 3.5 km con-veyor system. Each complete Feeder/Sizer station is a semi-mobile unitdesigned to take advantage of the mine�s existing crawler transporter.
MMD 1500 Series Twin Shaft Sizer
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TThhiiss ssyysstteemm rreedduucceesseennvviirroonnmmeennttaall iimmppaacctt.. WWhhyy nnoott ccoonnttaacctt MMMMDD..
MMD Natural Ground HopperFeeder / Sizer System
The two views superimposed show all the equip-ment, the working feeder being buried by rock.
(c) 1999The MMD Group of
CompaniesAll rights reserved. No part ofthis publication may be repro-duced, stored in a retrieval sys-tem,transmitted by any means,electronic, mechanical, photo-copying, or otherwise, withoutthe prior permission of the pub-lisher.
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SHORTHAUL
TRUCK &SHOVEL
OVERBURDENSPREADER
LONG HAUL3.5Km OVERLAND
CONVEYOR SYSTEM
SIZER STATION
NATURALGROUND HOPPER
TRUCK DUMP