This is from the Council -Lansdown masterplan 20223.2.2 Key...

This is from the Council -Lansdown masterplan 2022
3.2.2 Key issues of proponents
3.2.2.1 Queensland Pacific Metals (QPM)
 Road network – The proposed alternative local road alignment is an improvement to the layout and
efficiency of the facility; however, it has a negative impact on the efficiency of the road network within the
LEIP. Public road reserve access is required from Jones Road through the QPM site to the other areas
within the LEIP. The use of B-triple trucks (possibly quad-trucks), with reliance on access to Jones Road to
the north requires a high standard of road e.g., 27.3m wide road reserve. Accordingly, local road network
upgrades will involve land acquisition and need to be advanced as early enabling infrastructure. Enabling
works will be suitably constructed within the Jones Road Reserve approx. 30m and the existing north-south
unnamed road reserve (current reserve widths appear ~20m), however only one footpath verge will be
initially constructed on the western side. At a future stage road widening will occur and the eastern footpath
verge will be constructed.

So
The no name road being constructed is the first stage, 2nd stage will be to widen the same road to accommodate road train use.
Reading between the lines this road is being entirely constructed for the QPM tech project.
Pretty sure you are on the money!