Eastern Alaska Range (Alexandria-Wrangellia Terrane) PCD

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

Information leading to the delineation of this focus area

Basis for focus area Permissive geology, substantial ARDF occurrences with porphyry copper characteristics.
Identified resources Identified resources of copper, gold, and molybdenum.
Production None recorded.
Status Past and current exploration—NOTE: Orange Hill, Bond Creek, and others are now encapsulated by the Wrangell-St. Elias National Preserve, however other systems in the Slana region are on locatable ground.
Estimated resources Orange Hill: 320 Mt at 0.35% Cu, 0.03% MoS2 and 0.1 g/t Au; Bond Creek: 500 Mt at 0.4% Cu and 0.02% MoS2; Baultoff: 160 Mt at 0.09% Cu.
Geologic maps No modern mapping better than 1:250,000 scale.
Geophysical data Inadequate aeromagnetic and aeroradiometric coverage.
Favorable rocks and structures Calc-alkaline intermediate to felsic, arc-related monzonite, granite, diorite porphyries.
Deposits Orange Hill, Bond Creek, Carl Creek, Baultoff, Horsfeld.
Evidence from mineral occurrences ARDF occurrences including West Green, Grubstake, Orange Hill, Bond Creek, Baultoff, etc.
Geochemical evidence Cu, Mo, Pb, Zn anomalies in rock chips and streambed sediments.
Geophysical evidence No data.
Evidence from other sources Favorable calc-alkaline felsic to intermediate arc rocks with locally reactive host rocks.
Cover thickness and description Unknown.
Authors Douglas C. Kreiner, James V. Jones III, Melanie B. Werdon.
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.