Placer Au

Region Alaska, Alaska
Mineral systems
Deposit types
Critical minerals
Other minerals

Information leading to the delineation of this focus area

Basis for focus area ARDF occurrences, prospectivity mapping analysis (Jones and others, 2015; Karl and others, 2016).
Identified resources Historical production of gold.
Production Production variable by district.
Status Past mining, variable by district.
Estimated resources None.
Geologic maps 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 Bedrock exposures in known or suspected mineral districts containing lode gold, Sn-W, PGE, and(or) REE mineralization.
Deposits See linked geodatabase from Karl and others (2016) for placer district names.
Evidence from mineral occurrences ARDF occurrences.
Geochemical evidence Au, Ag, Ti, W anomalies in stream sediment; Au, Sn, Ti, PGE, REE minerals in heavy mineral concentrate.
Geophysical evidence No data.
Evidence from other sources Permissive geologic terrane and known occurrences.
Comments See linked geodatabase from Karl and others (2016) for placer district names and associated resources/commodities.
Cover thickness and description Unknown.
Authors Douglas C. Kreiner, James V. Jones III, Melanie B. Werdon.
New data needs New mapping, landscape analysis and modeling using new elevation data, 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.