RE:Getting closer"to the deadline for the talks to be completed,"
I read it as the proceding will start April 2024 From the latest MD&A
In my opinion Rio will not want this to start
"The commencement of binding arbitration proceedings followed protracted discussions with Rio Tinto and OTLLC. The arbitration was commenced in Vancouver, British Columbia under the International Commercial Arbitration Act (British Columbia). A three-member Tribunal has been appointed and a merits hearing has been set for April 2024."