Geochemical and geological reconnaissance in the Seventymile River area, Alaska

Geochemical data were secured from 322 stream-sediment samples, 207 rock samples, and 76 soil samples collected in the Seventymile River area. Geochemical anomalies occur in the Flume Creek-Alder Creek, Crooked Creek, American Creek, and Eagle Bluff areas. Gold in the Flume Creek-Alder Creek area south of the Seventymile River is believed to be associated with ultramafic bodies in a fault zone. Placer gold and other metals in anomalous amounts in stream sediments north of the Seventymile River in the Crooked Creek area may be related to dikes and faults that cut Tertiary and Tertiary (? ) sedimentary rocks. Geochemical sampling in the American Creek and Eagle Bluff areas did not define any new mineral deposits, but several anomalies of unknown origin, particularly in the Eagle D-2 and D-3 quadrangles, are worthy of further investigation.