Wrangell Mountains-Kennecott Sed Cu

Region Alaska, Alaska
Mineral systems
Deposit types
Other minerals

Information leading to the delineation of this focus area

Basis for focus area Kennecott-type copper deposits, favorable host and source rocks, tectonic setting.
Identified resources Historical production of copper.
Production Early 1900s to about 1930.
Status Past mining; current and past exploration.
Estimated resources No new resources.
Geologic maps No modern mapping better than 1:250,000.
Geophysical data Inadequate aeromagnetic and aeroradiometric coverage.
Favorable rocks and structures Triassic Nikolai greenstone and associated ultramafic intrusions provided a source of Cu, Co, and other metals that circulated through and were trapped within the overlying reactive Chitistone limestone.
Deposits Kennecott mine (numerous lodes grouped under this name; for example, Bonanza-Mother Lode, Jumbo and Erie) with historical production of 1.18 billion lbs of Cu and around 9 Moz of Ag.
Evidence from mineral occurrences Multiple additional ARDF occurrences including Denali, Lichen and Blue Lode.
Geochemical evidence Anomalous Co, Ge, Ga and/or Ag concentrations in streambed sediments and rock chips.
Geophysical evidence No data.
Evidence from other sources Prospectivity analyses conducted by Karl and others (2016) show large areas of this region containing HUC's with medium to high prospectivity with medium to high certainty.
Comments Part of this geologically favorable terrane is included in Wrangell-Saint Elias National Park.
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.