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someone please explain

Discussion in 'Heavy Equipment & Pavement' started by hoeman376, Jan 1, 2013.

  1. hoeman376

    hoeman376 LawnSite Senior Member
    Posts: 328

    http://www.ebay.com/itm/Continuous-Excavator-600-to-900-Tons-and-Hour-Mining-FLSMIDTH-Rahco-CME-12-/230903793487?pt=LH_DefaultDomain_0&hash=item35c2f0474f
     
  2. Scag48

    Scag48 LawnSite Fanatic
    Posts: 6,068

    Says it's for open face coal mining however I'd have to argue that. You'd have to wait for trucks just like a front shovel, so unless there was some sort of walking conveyor/stockpile pit that followed the machine around that conveyor loads the trucks, I don't see how it would be more efficient than a front shovel. I could see this as being more of a shaft mining machine but it's pretty large for that. Definitely a unique piece of gear.
     
  3. alco

    alco LawnSite Senior Member
    Posts: 255

    That's a Rahco surface miner. Basically, it's just like an asphalt milling machine, and pulverizes the material it's being used on, as well as loads it out at the same time. Typically, they are used for thin seams of material, or large flat lying deposits.

    It has to stop periodically to exchange trucks under the conveyor, but only really has to pause for a couple seconds while the next truck spots in. In a thin seam, a shovel will have to move too much while loading, and can't easily shave off a thin layer like this machine can.

    While the machines are a bit different, here's a video of a surface miner being used on iron ore in Australia. Same general concept, but a slightly different machine design, as the Rahco uses a front mounted cutting drum.

    http://www.youtube.com/watch?v=T_o1KuG3Y8A

    One really nice advantage of a surface miner, is that you don't need a primary crusher. These don't need blasting either, though they aren't made for extremely hard rock.

    Basically, they have some applications where they excel, and others where they are not practical.
     

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