Seward Peninsula

Region Alaska, Alaska
Mineral systems
Deposit types
Other minerals

Information leading to the delineation of this focus area

Basis for focus area Presence of disseminated gold-hosted in a shale-carbonate sequence, local ARDF occurrences.
Identified resources None.
Production None recorded.
Status Unknown.
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 Highly deformed shale-carbonate package has been metamorphosed to a metasedimentary sequence that includes schistose, micaceous, dolomitic marble; mica-calcite schist; and minor micaceous quartzite.
Deposits None.
Evidence from mineral occurrences ARDF occurrence.
Geochemical evidence Anomalous As, Hg, Sb and Au.
Geophysical evidence No data.
Evidence from other sources Historical exploration reports describe mineral occurrences consistent with possible Carlin-style mineralization.
Comments Intense deformation clouds the interpretation in this region. The mineralization is consistent with disseminated gold, and no known intrusions are found nearby. Plumbing networks are present across the region that may have transported basinal fluids, however this appears to be a relatively isolated setting.
Cover thickness and description Unknown.
Authors Douglas C. Kreiner, James V. Jones, III.
New data needs New mapping, geophysics, updated geochemical sampling.
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.