Brooks Range-Central Belt Sed Cu

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

Information leading to the delineation of this focus area

Basis for focus area Presence of extensive carbonate host rocks, tectonic environment.
Identified resources Identified resources of cobalt and copper.
Production None recorded.
Status Past exploration drilling.
Estimated resources Bornite: Indicated and Inferred resource of 201,061,344 short tons grading 1.57% Cu (6,364,000 lbs Cu) and 0.02% Co (77,000 lbs Co).
Geologic maps No modern mapping better than 1:250,000 scale.
Geophysical data Inadequate aeromagnetic and aeroradiometric coverage.
Favorable rocks and structures Thick sequences of carbonate rocks overlain by shale, intruded by younger granitic plutons.
Deposits Ruby Creek in ARDF which is part of the Bornite deposit in the Ambler district contains 6.364 million lbs of Cu and 77,000 lbs Co.
Evidence from mineral occurrences Numerous ARDF occurrences including Ruby Creek (Bornite), Sheep Creek, Omar, Peak, Frost and Deadfall.
Geochemical evidence Anomalous Co, Ge, Ga and/or Ag concentrations in stream 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 Carbonate rocks in this belt parallel a significant volcanogenic massive sulfide belt with numerous VMS/sediment hosted Cu deposits with defined resources (Cu, Pb, Zn, Au, Ag).
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.