One 600 tonne class excavator on a mine site is a trial. Two is a decision about the trucks.
Liebherr said on 20 July that Liebherr-Australia has delivered its first machines to Gold Fields at the Gruyere gold mine in Western Australia. A Liebherr R 9600 and an R 9400 went in during May, then a second R 9600 followed in June. That is the whole announcement, and the interesting part is the order of it.
The Liebherr R 9600 and R 9400 that went into Gruyere
The R 9600 is Liebherr's 600 tonne class hydraulic mining excavator. Liebherr lists it at 633 tonnes operating weight with a 37.5 m³ bucket and diesel power between 2,500 and 2,700 kW, with an electric version at 2,400 kW. The R 9400 beside it is a different animal: 345.5 tonnes as a backhoe, a 24 m³ bucket, and either a 1,250 kW Cummins QSK50 or Liebherr's own 1,350 kW D9812.
Why the second R 9600 is the real signal
A machine that size earns nothing on its own. It earns when the trucks under it never wait, because every minute the boom hangs in the air at 633 tonnes is paid for whether it is loading or not. One of them can be run as a trial. Ordering another a month later says the haul fleet was already sized around it.
That is my read and not Liebherr's. The release does not explain the sequencing, and nobody at the mine has said anything about it publicly. But sequencing tends to be the honest part of a delivery announcement, because it is the bit nobody writes for effect.
The R 9400 alongside it is doing a different job
Half the weight, two thirds of the bucket, roughly half the power. That is not a smaller version of the same machine, it is a second tool for a different face, and it arrived in the same fleet in the same month. From the mine's side of the desk that reads as a fleet matched before it was bought. From Liebherr's side it is the better sale, because a maker with two sizes in one pit keeps its parts and its service people on site.
Whatever size you are looking at, the number worth chasing is not the bucket. It is how long the thing carrying the load away has to sit and wait for it.
Source: Liebherr. Image: Liebherr.
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