In 1977-78 the U.S. Bureau of Mines and the U.S. Geological Survey formed study teams to investigate mineralization and geology related to mineralization in the National Petroleum Reserve in Alaska (NPR- A). The work area is north of the confluence of Driftwood Creek and the Utukok River, in the southwestern part of the NPR-A. The 1977 fieldwork consisted of geological mapping, geochemical sampling, aerial geologic reconnaissance, and site specific investigations and sampling. During the 44-day 1978 field season, Bureau professionals prospected and sampled areas where results of the 1977 geochemical survey indicated the presence of anomalously high metal concentrations. The prospecting consisted primarily of creek traverses in search of mineralized rock that could account for the geochemical anomalies. Stream sediment samples were collected from tributaries of the geochemically anomalous drainages. The report summarizes the 1978 Bureau fieldwork and presents analytical results.