| Basis for focus area |
Prospectivity analysis for VMS systems has highlighted this region as containing a number of drainage basins containing medium and high prospectivity based on the presence of appropriate geochemical anomalies, ARDF occurrences, and lithology. Presence of the Orca Group succession of predominantly pillow basalt, gabbro, and minor pelitic sedimentary rocks is indicative of seafloor volcanism associated with the mineralization. |
| Identified resources |
Historical production of gold. |
| Production |
Variable by district. |
| Status |
Past mining; current exploration. |
| Estimated resources |
Unknown. |
| 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 |
Orca Group consists of sheeted basaltic to diabasic mafic dike complexes, pillow basalts, and gabbro sills with minor pelitic sedimentary sequences consisting of sandstone and argillite. |
| Deposits |
Beatson, Ellamar, Threeman. |
| 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 |
High potential prospectivity determined by Karl and others (2016); more than 150 ARDF occurrences. |
| Comments |
The Resurrection ophiolite complex represents a seafloor volcanic and magmatic system that contains a number of relatively small past producers for Cu, Ag, and minor Au. More than 150 ARDF occurrences for volcanogenic seafloor style mineralization have been identified, and recent prospectivity analyses have highlighted this belt has moderate to high prospectivity. |
| 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. |
