Historic mining stuff on the reservation (north) side of the river. It was near the mouth of Medicine Creek . Some research reveals that this is the remains of a gravity concentration plant for extraction (benification) of manganese from ore that had been mined near Medicine Butte. By 1967 it had been dismantled. The greatest production of ore from these mines, approx 12,000 tons, was made in 1955 and 1956.