if my memory services me correctly the machine at eldorado is a gold dredge its been about 50 years since i was there and it just looked like a big heap of rust it was left right were it stopped working.
Nearly bloody drowned there on my first visit to Oz. Brilliant sight tho’, and the pool that the dredger is in is cool and a good place to go under !
It may have been a complete disaster as far as the planet is concerned but things were different in those days. I wouldn’t want one of these in MY back yard today !