Gladstone Prospect, Cholmondeley Sound, Prince of Wales Island, Ketchikan Mining District, Prince of Wales-Hyder Census Area, Alaska, USAi

Regional Level Types
Gladstone Prospect	Prospect
Cholmondeley Sound	Bay
Prince of Wales Island	Island
Ketchikan Mining District	Mining District
Prince of Wales-Hyder Census Area	Census Area
Alaska	State
USA	Country

Location: The Gladstone property extends over 4 claims. The site is at the northern workings at an elevation of about 150 feet. It is about 0.7 mile east of triangulation station Lancaster and about 0.5 mile west-northwest of the center of section 6, T. 77 S., R. 89 E. The property extends for about a half mile south-southwest to an open cut at an elevation of about 400 feet.
Geology: As originally described by Wright and Wright (1908), the Gladstone deposit consists of several brecciated quartz-calcite veins up to 6 feet thick, exposed over a distance of about a half mile. The veins contain pyrite and chalcopyrite; the host rock is mainly marble with schist layers that is part of the Wales Group of Late Proterozoic and Cambrian age (Eberlein and others, 1983; Brew, 1996). The property extended over four claims and included a tunnel and several open cuts. The deposit was examined by Maas and others (1991) and by Hedderly-Smith (1999 [Inventory]), who reinterpreted it as conformable gold- and copper-bearing breccia zones in carbonate rocks similar to deposits to the south in the Kael-7 Mile Trend (CR188). Maas and others (1991) examined the Gladstone adit, where a 10-foot-wide shear zone is exposed that contains quartz-marble breccia. The shear zone is up to 20 feet wide at the surface. Nine chip samples contained 19 to 190 parts per billion (ppb) gold and 1,742 parts per million (ppm) to 2.05 percent copper. A sample collected by Hedderly-Smith (1999 [Inventory]) across a 6-foot mineralized zone with about 5 percent pyrite and chalcopyrite contained 7,669 ppm copper and 11 ppb Au.
Workings: Workings consists of a short adit and several open cuts over a distance of at least 0.5 mile.
Age: Younger than the Late Proterozoic or Cambrian host rock.
Alteration: If this deposit is similar to those in the Kael-7 Mile Trend (CR188), it is associated with silicification and dolomitization of the marble host rock.

Commodities (Major) - Au, Cu
Development Status: None
Deposit Model: Probably a stratiform Au-Cu breccia zone in marble.

Other Databases

Link to USGS - Alaska:	CR185

Other Regions, Features and Areas containing this locality

References