Seward Peninsula

Region Alaska, Alaska
Mineral systems
Deposit types
Other minerals

Information leading to the delineation of this focus area

Basis for focus area Mineral occurrences interpreted to represent both clastic and carbonate dominant Pb-Zn occurrences are documented along the belt. This belt is also highlighted by prospectivity analyses relying on favorable stratigraphy and geochemical signatures of sediments and rocks.
Identified resources None.
Production None recorded.
Status Past exploration.
Estimated resources None.
Geologic maps Till and others (2011), scale 1:500,000; Statewide geologic map database; Wilson, Hults and others (2015), scale 1:1,584,000.
Geophysical data Mostly (>90%) inadequate aeromagnetic and aeroradiometric coverage.
Favorable rocks and structures On the Seward Peninsula, Late Proterozoic to Devonian metasedimentary rocks of the Nome Complex which represent a continental margin carbonate platform and related rocks (Till and others, 2014). On St Lawrence Island, Triassic limestone, chert, shale, and siltstone host clastic-dominated Pb-Zn deposits (Patton and Dutro, 1969).
Deposits None.
Evidence from mineral occurrences Numerous ARDF occurrences including Aurora Creek, Galena, Quarry, Wheeler North and Nelson.
Geochemical evidence Sediment and panned concentrate samples contain Ag, Ba, Pb, and Zn anomalies well above background. Rock samples contain elevated Ag, Ba, Pb, Zn with isolated Co, Cu, Ge, and Tl.
Geophysical evidence No data.
Evidence from other sources Prospectivity analysis for sediment hosted Pb-Zn deposits delineates the belt as having moderate and high prospectivity (Kelley and others, 2021).
Comments Known mineral occurrences determined through stable isotope and detailed mapping at Aurora Creek, Galena and elsewhere fit the sediment-hosted Pb-Zn mineral deposit and Basin related mineral systems. Additional prospectivity analyses show this region as highly prospective.
Cover thickness and description Unknown.
Authors Douglas C. Kreiner, James V. Jones, III.
New data needs New mapping, geophysics, updated geochemical sampling with a focus on increasing trace element datasets for Ge, In and other critical minerals.
Geologic mapping and modeling needs Mapping at 1:100,000 scale or better.
Geophysical survey and modeling needs Aeromagnetics and radiometrics collected at Rank 2.
Digital elevation data needs IfSAR coverage is complete over entire focus area.