Coast Mountain Belt

Region Alaska, Alaska
Mineral systems
Deposit types
Other minerals

Information leading to the delineation of this focus area

Basis for focus area Prospectivity analysis for VMS systems highlights this region containing a series of moderate prospectivity drainage basins with multiple ARDF occurrences located in roof pendants of Paleozoic pelitic shallow water marine sediments.
Identified resources None.
Production None recorded.
Status Unknown.
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 Pelitic and quartzo-feldspathic paragneiss and minor dolomitic marble preserved as roof pendants to the Tertiary-Cretaceous Coast Mountains Batholith.
Deposits None.
Evidence from mineral occurrences ARDF occurrences.
Geochemical evidence Sediment and soil anomalies in pathfinder elements including Cu, Ag, Pb, Zn, Cd, or Co. Additional geochemical evidence comes from pan concentrates containing anglesite, cerussite, chalcopyrite, copper sulfide/oxide, galena, or sphalerite. Heavy Mineral concentrates containing Cu, Pb, Zn or Ag.
Geophysical evidence No data.
Evidence from other sources Moderate potential defined by prospectivity analysis; Karl and others (2016).
Comments ARDF mineral occurrences are hosted in metamorphosed pelitic sedimentary and carbonate rocks consistent with shallow marine environments. The sedimentary rocks are only preserved as roof pendants within the Coast Mountains batholith. ARDF occurrences are widely scattered in the region.
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.