The river basin is in the 2,585,910 hectares (6,389,900 acres) Waimiri Atroari Indigenous Territory.

[1] Tailings of processed tin ore from the Pitinga mine are held in holding ponds as a reserve that may be further processed if justified by a rise in the price of tin.

The sediment was released into the Alalaú River, and the pollution affected the fish downstream in the Waimiri-Atroari Indian Reserve.

[2] The Indians reported that the polluted water had made them ill.[3]

This article related to a river in the Brazilian state of Amazonas is a stub.