The stratigraphic setting and geological environment of the Boorloo stratiform copper prospect is described. This prospect occurs in the Umberatana Group of the Adelaide Supergroup in the Willouran Ranges of South Australia. Stratiform copper mineralization occurs in stacked, braided, siliciclastic channels on the middle and distal portions of a late Proterozoic river-dominated delta. Comparison is made between this river-dominated delta copper system and the much larger river-dominated delta copper system of the Proterozoic Udokan deposit in the U. S. S. R. It is suggested that the traditional classifications of stratiform copper sensu strictu deposits as arenaceous-ore or oreshale can be viewed as dip-system or strike-system deposits respectively.