Unnamed Occurrence (ARDF - CR106), 'Cable Creek', Trocadero Bay, Prince of Wales Island, Ketchikan Mining District, Prince of Wales-Hyder Census Area, Alaska, USAi

Regional Level Types
Unnamed Occurrence (ARDF - CR106)	- not defined -
'Cable Creek'	Creek
Trocadero Bay	Bay
Prince of Wales Island	Island
Ketchikan Mining District	Mining District
Prince of Wales-Hyder Census Area	Census Area
Alaska	State
USA	Country

Location: This occurrence is in an outcrop on the east side of the Hydaburg road at the bridge over locally-named Cable Creek. It is near the center of the NW1/4 section 20, T. 75 S., R. 83 E.
Geology: This mineralization, at a roadside outcrop, has been known since at least the 1980's, when industry was searching for volcanogenic massive-sulfide deposits and staked claims throughout the area. The outcrop consists of about 200 feet of chlorite-quartz schist and sericite-quartz schist, possibly derived from a felsic volcanic protolith. The rocks are part of the Wales Group of Late Proterozoic and Cambrian age (Eberlein and others, 1983; Brew, 1996). Locally, the rocks contain chalcopyrite, sphalerite, and up to 20 percent pyrite; there is minor copper staining. Grab samples of the sulfide-rich layers contained up to 1 part per million (ppm) silver, 2,000 ppm copper, and 500 ppm zinc (D.J. Grybeck, unpublished analyses, 1991). A selected sample collected by Maas and others (1995) contained 2.5 percent copper, 1.0 percent zinc, 790 parts per billion gold, and 11.6 ppm silver. They conclude that while the mineralization at this outcrop is limited in extent, it suggests the potential for volcanogenic massive sulfide deposits nearby in Wales Group rocks.
Workings: This roadside outcrop has been sampled several times by government and industry geologists since at least the 1980's.
Age: A volcanogenic massive-sulfide deposit in Cambrian or older rocks.

Commodities (Major) - Ag, Cu, Zn
Development Status: None
Deposit Model: Probably a Kuroko massive sulfide deposit (Cox and Singer, 1986; model 28a).

Other Databases

Link to USGS - Alaska:	CR106

Other Regions, Features and Areas containing this locality

References