There are a few imports, a big one is caustic for the alumina refineries. Exports are mainly wood chips, minerals/ mineral sands, alumina. They are the big ones. Only alumina is on rail, the rest is road hauled. The lithium mine down south was proposed to be on rail, however the refinery has already been scaled back while still under construction, and I believe mine expansions have either stopped or slowed. Open to corrections it’s been four months since I spoke to someone who knows. It’s very unlikely it will go on rail even at full expansion as planned, it will simply cost too much for little return. Lithium has the potential to reduce in demand quickly as better battery materials are developed.
For a full breakdown of port activities visit Bunbury Port Authority webpage for shipping information. It’s very good. The port upgrades will be relatively minor I suspect as Carbone are not a huge company but quite effective at what they do.