A steep two-to-three-hour climb above Jiwika brings you to a small saline spring used by Dani women for generations to produce salt. The traditional method involves soaking lengths of banana trunk in the brine, drying them in the sun, and burning them; the ash is the salt.
Hire a guide in Jiwika — the path is not obvious, and a guide can interpret what you're seeing and arrange permission to watch (or, if your timing is right, take part). Expect steep ground and a steady climb. Allow most of a day from Jiwika.