Hi,
Over the years I have noticed that a few large draglines are either assembled or scrapped at far ends of sites.
I assumed that it would be easier to get the parts to the errection site or to remove scrap if the machine was in a more accessable location, however, wondered if the cost to move them to and from the work site might be too high to justify a long 'walk'?
Any ideas how much electricity a large dragline would use if walking, say, a killometer?
Thanks,
Cost to move draglines
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Re: Cost to move draglines
That's a lot of dough but if you relate it to the cost per tonne I bet its small!
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Re: Cost to move draglines
bigkit wrote::?: That's a lot of dough but if you relate it to the cost per tonne I bet its small!
Say 10:1 strip ratio @ $100ton (Have seen up @ $380ton)
Say the shovel does 300 Ton a minute that's 30ton of coal a minute.
30x100 = $3000 of coal a minute retail. You could maybe pull $2500 to $2900 of that for the cost to haul, crush, blend, clean, load & rail it out.
$100 to $500 a minute it can make depending on coal price, haul conditions and weather! Strip ratio can vary drastically. Biggest seam here is 7mt thick. It's cheaper to just load out and spoil smaller seams.
They never calculate a shovel production / cost by the minute. Usually by the shift, week, month or 1/4. It's fine and dandy in a perfect word but av seen them break shipper shafts, that's a week of down time.
Sorry, off topic.
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Re: Cost to move draglines
No worries guys.
Actually my calculations are off. In a perfect world a 4100 XPC AC @ 72yrd will load a 930 every minute but it never works out like that. You need to take into account the shovel moves allot, even just advancing into the face takes a little time, AC's move allot faster than DC as there's no propel contactors. Then once it gets pinched out it needs to move over left or right, drive way clean ups result in one side loading although this is preferred during a break.
Around 32 load's is a great hour.
Actually my calculations are off. In a perfect world a 4100 XPC AC @ 72yrd will load a 930 every minute but it never works out like that. You need to take into account the shovel moves allot, even just advancing into the face takes a little time, AC's move allot faster than DC as there's no propel contactors. Then once it gets pinched out it needs to move over left or right, drive way clean ups result in one side loading although this is preferred during a break.
Around 32 load's is a great hour.
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