| Basis for focus area |
Permissive geology, substantial ARDF occurrences with porphyry copper characteristics. |
| Identified resources |
Identified resources of copper, gold, molybdenum, PGE, rhenium, and silver. |
| Production |
None recorded. |
| Status |
Current and past exploration. |
| Estimated resources |
Pebble: 5,942 Mt at 0.42% Cu, 0.025% MoS2, 0.35 g/t Au, 140 Moz Ag, 1.2 million kg Re, and 907,000 oz Pd; Whistler: 79.2 Mt at 0.17% Cu and 0.51 g/t Au; Kijik: 91 Mt at 0.3% Cu and 0.17% MoS2; 38 Porphyry: 500 Mt at 0.32% Cu and 0.33 g/t Au; 52 Porphyry: 150 Mt at 0.35% Cu; Island Mountain: 31.1 Mt at 0.06% Cu and 0.49 g/t Au. |
| Geologic maps |
No modern mapping better than 1:250,000 scale. |
| Geophysical data |
Inadequate aeromagnetic and aeroradiometric coverage. |
| Favorable rocks and structures |
Calc-alkaline diorite porphyry, granodiorite porphyry, dacite porphyry, breccia pipes, and associated coeval andesite volcanic rocks. Arc magmas span the Early Cretaceous through the Paleocene. |
| Deposits |
Pebble, Whistler, Kijik, 38 porphyry 52 porphyry, Island Mountain. |
| Evidence from mineral occurrences |
Numerous ARDF occurrences, including Pebble, Whistler, Island Mountain, etc. |
| Geochemical evidence |
Mo, Cu, Ag, Au, Pb, Zn. |
| Geophysical evidence |
Detailed aeromagnetic data shows strong magnetic highs associated with batholiths exhibiting strong spatial proximity to known porphyry systems, and potential concealed porphyry systems. |
| Evidence from other sources |
Favorable calc-alkaline felsic to intermediate arc rocks associated with a minimum of three arc cycles, and possibly as many as 5, with locally reactive host rocks. |
| Cover thickness and description |
Parts of Pebble are covered by as much as 1,000 m of post-mineral cover, and Pebble itself is tilted by as much as 25ยบ post-mineral-suggestive of further concealed and tilted, and/or dismembered porphyry systems. |
| 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. |
