Yukon-Tanana Upland Porphyry

Region Alaska, Alaska
Mineral systems
Deposit types
Other minerals

Information leading to the delineation of this focus area

Basis for focus area Permissive geology, substantial ARDF occurrences with porphyry copper characteristics and known deposits.
Identified resources Identified resources of copper, molybdenum, gold, and silver.
Production None recorded.
Status Past and current exploration.
Estimated resources Taurus: 68.3 Mt at 0.28% Cu, 0.039% MoS2; Mosquito: 10 Mt at 0.35% Cu and 0.03% MoS2; Peak: c11.624 Mt at 0.153% Cu, 0.114 oz/t Au, and 0.421 oz/t Ag.
Geologic maps New 1:63,360-scale mapping in progress in the Tanacross and Eagle quadrangles. Large sections of area are unmapped at better than 1:250,000 scale.
Geophysical data Inadequate aeromagnetic coverage, will be partly addressed by planned Phase 1 EMRI data acquisition.
Favorable rocks and structures Calc-alkaline to alkaline arc-related granite, monzodiorite, granodiorite, monzonite plutons. Mildly alkaline peraluminous biotite granite and monzonite plutons.
Deposits Taurus, Peak Gold, and Mosquito.
Evidence from mineral occurrences ARDF occurrences including Taurus, Bluff, Dennison, Mosquito, Little Enchilada, Huneedoo, Section 21, Quartz Porphyry, Peak, Road Metal, Little Whiteman, Shorty Creek, Section 21, Quartz Porphyry.
Geochemical evidence Mo, Cu, Ag, Pb, Zn in rock chip and soil geochemical anomalies.
Geophysical evidence No data.
Evidence from other sources Favorable calc-alkaline felsic to intermediate arc rocks with locally reactive host rocks. This is a permissive geologic terrane, known deposits, occurrences.
Cover thickness and description Unknown, but exposed porphyry systems show evidence of 45ยบ of post-mineral tilting, strongly suggesting that portions or entire systems are buried and/or concealed and dismembered.
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.