Rio Tinto will dismantle the mine infrastructure and hand land back to traditional owners.
The specials tender includes 28,399 carats of rough Argyle diamonds.
The collection includes 62 diamonds weighing 57.23 carats that were collected in the past year.
The renewed contract will see Sodexo expand employment opportunities to locals.
Argyle diamonds still shining.
Pink diamonds from Argyle go up for auction.