Ann: Catalina Consolidation Provides Potential Resource Increase, page-39

Allkem's Olaroz project mentions three ports, Buenos Aires in Argentina and Antofagasta and Iquique in Chile. You can do a quick search on Google Maps using 'Incahuasi, Catamarca' as the closest village to HMW to gauge these options:

• Antofagasta Port in Chile makes the most sense, it is 684km to the NW, or approximately 11 hours
• Iquique Port is further north again, 900km or 13 hours
• Buenos Aires has the advantage of staying in country, but is a fair whack: 1,664km or 21 hours
  

Ultimately it will all depend on what capacity/availability is at the target port; there's no guarantee they can access capacity (this is often a constraint of resource projects that gets overlooked by the average punter). If they decided to stay in country and use a major port like Buenos Aires, it'd need to be trucked some distance to a TLO then railed. I don't recall seeing anything in the DFS stage 1 about this, as it is entirely dependent on the export license and per JP's last comment, Catamarca was 50/50 in this. But it's definitely worth considering the logistics/costs, it does get overlooked.