Spodumene tumbled to $US3256 a tonne in the June quarter, down from $US4840 a tonne.
Pilbara says the weakness reflected a price war between Chinese carmakers.
It wants to be involved in the whole lithium supply chain, including processing.
Market reactions in the ASX lithium sector are often disproportionate responses to a small piece of market pricing, says Pilbara Minerals boss Dale Henderson.
