A reconnaissance stream-sediment geochemical survey was conducted in the Baird Mountains 1 °X3° quadrangle in northwestern Alaska. The quadrangle is largely underlain by complexly deformed Paleozoic marine carbonate, pelitic, and clastic rocks. Subordinate amounts of Precambrian metamorphic and igneous rocks crop out in the northeastern part of the quadrangle, and minor Mesozoic marine sedimentary and mafic volcanic rocks occur in the northwestern part of the quadrangle. Sediment-hosted base-metal sulfide mineral occurrences and local placer-gold accumulations are known within the Baird Mountains quadrangle. A total of 1,493 stream-sediment samples and 1,185 nonmagnetic heavy-mineral-concentrate samples were analyzed for 33 elements by semiquantitative emission spectrography. The spatial distribution of the data was examined using both individual-element concentrate plots and R-mode factor-analysis score plots. Geochemical data were also interpreted for 913 sediment samples and 916 water samples collected during the U.S. Department of Energy 1 s National Uranium Resource Evaluation (NURE) survey of the quadrangle. These samples were analyzed by neutron-activation analysis and X-ray fluorescence. Geochemical anomalies from the various data sets define 17 anomalous areas characterized by metal associations that suggest the presence of metallic-mineral occurrences. Sediment and (or) concentrate samples that are anomalous in base metals and silver were collected within many areas of the quadrangle. Detailed follow-up investigations would be needed to distinguish the areas that might contain large metalliferous accumulations from those that have widespread disseminations of the metals. Many drainages underlain by Paleozoic carbonate and clastic rocks within the Aklumayuak Creek watershed, in the northeastern corner of the quadrangle, yielded concentrate samples with anomalous silver and lead values. NURE sediment samples from the same area are anom-Manuscript approved for publication July 25, 1991. alous in lead, antimony, and zinc. To the southeast of Aklumayuak Creek, sediment samples throughout the Nanielik Creek watershed, derived from both Precambrian and Paleozoic sedimentary rocks and greenstone, are enriched in cobalt, copper, iron, molybdenum, nickel, lead, and zinc. Tributaries to the Tutuksuk River, Anaktok Creek, Sheep Creek, Kanaktok Creek, and the Salmon River within the eastern part of the quadrangle, underlain mainly by Paleozoic schist and lesser amounts of carbonate rocks, yielded sediment samples that commonly contain anomalous amounts of cobalt, copper, iron, nickel, and zinc, and corresponding concentrate samples that are commonly anomalous in silver and lead. These metal suites suggest the presence of mineralized rock that may include metal-bearing quartz veins, base-metal-rich pods, and(or) rock containing disseminated metals. In the central part of the quadrangle, base-metal anomalies in samples occur throughout the watersheds of Nakolikurok Creek, the Nakolik River, and the headwaters of the O...