Mount Lyell Mine.

Foden DG series Dump Truck, possibly a DGD6/12 with 102 horsepower Gardner 6LW.

This is a neat photo-shows the father and son. The boy is a KZ series Leyland Cub, while the Dad is an EH series Leyland Super Hippo. The Super Hippo would probably have a 125 horsepower O.600 motor.

White WA series Dump Truck.

1936 Ford model 51 Refuelling Truck.

That fleet # W1 must have been jinxed, it is the same truck jack knifed and with the trailer base over apex, I can't quite make out the fleet number on the front of the Foden rigid tipper, but it looks a 1, could that be after it was repaired from the trailer tipping over? The picture of the trailer tipped over you can see they have actually blocked up the front of the trailer to start lifting it off the truck, I don't rate old mates chances of survival very high if he was sitting in the drivers seat.

Lineup of Leyland and International Dump Trucks.

Leyland Super Hippo being loaded by Face Shovel, International D series 6 wheeler, probably a D246F waiting to load.

Another very interesting set of photos.
I don't know how many mines, or even how many companies.
There were two zones: Mt Lyell, and north Mt Lyell.
The rival companies each built a railway from mine to port. The north was the better engineered, but closed first. A lot of it is available as a 4wd track today.
The Mt Lyell one lingered to 1963, was closed and dismantled, then was rebuilt with federal and state money as a sop for the scaling back of forestry. News of the week is that the franchisee has announced the suspension of operation.
The famous Australian historian Geoffrey Blainey authored a book (Peaks of Lyell?).
One chapter covers the c1912 Mt Lyell mine disaster. IIRC that was the worst mining disaster to that date in Australia. It was notable in the logistics of assembling the rescue operation, and in its changing the attitudes of management and safety.
Initially the company held off, then called for assistance too late.
Experienced mine workers and equipment came from the gold mines of Ballarat and Bendigo (Victoria); steamship Loongana made a record sprint from Melbourne to Burnie; Emu Bay Railway had had a train on standby all night for the dawn arrival, and dashed over its tracks to Zeehan, with a connection over the government railway to Strahan, and the Mt Lyell railway to Queenstown.
There is a lot available on this disaster by googling.

Roderick B Smith
Rail News Victoria Editor

One of the Leyland Cubs and probably a C series International-C50 maybe, hitched to a single axle dump trailer tipping off.