The Alaskan mineral resource assessment program:

aeromagnetic map ages determined Alaska AMRAP Big Spruce Creek blueschist Brooks Range Brosge and Reiser calcareous schist Chandalar Lake Chandalar quadrangle Chandalar quadrangle Brosge Chandalar River Chipp conglomerate copper Creek pluton Cretaceous Devonian distribution and abundance drift Dutro Field Studies Map folio Geochemical distribution geochemical map Geological and Geophysical Geophysical Surveys Glaciation glaciers glaucophane glaucophane schist facies granitic rocks granodiorite Hamilton and Porter hornblende hornblende hornfels facies hornfels Hunt Fork Shale Kobuk Trench Koyukuk River Landsat imagery limestone and siltstone mafic map of Chandalar Marsh and Wiltse Mesozoic metamorphic Middle Fork mineral deposits Mineral Resource Assessment Mineral Resource Maps Mississippian northern older Paleozoic phyllite pluton quadrangle fig quartz-muscovite schist resource potential revised rocks and chert Sagavanirktok samples schist units sedimentary rocks sheets siltstone siltstone unit Silurian Skajit Limestone stream sediment Survey Misc Survey Open-File Report tactite troy oz U.S. Geol U.S. Geological Survey ultramafic unconformity volcanic rocks western Brooks Range zircon