Argonomist's Book artifact

I am having trouble getting three stars for this artifact. Which level contains the Orichaculum artifact?

Orichaculum is a resource you collect to make the Argonomist Book. One level it is on is level 15 and you trade 160? coconut oil to the tribesman behind the temple for it. I tried to replay the level to get another Orichaculum but it just gives me ore, so I guess you can't replay levels for more of the resources. Just must have to collect it as you go along by looking in the trunks and trading the tribesman.

Just played bonus level 5, there are 2 Orichaculum in the trunks