Gould Prospect, Sukkwan Lake, Sukkwan Island, Ketchikan Mining District, Prince of Wales-Hyder Census Area, Alaska, USAi

Regional Level Types
Gould Prospect	Prospect
Sukkwan Lake	Lake
Sukkwan Island	Island
Ketchikan Mining District	Mining District
Prince of Wales-Hyder Census Area	Census Area
Alaska	State
USA	Country

Location: The Gould prospect is near the south end of Sukkwan Island about 0.7 mile south of the south end of Sukkwan Lake. It is near the center of section 16, T. 79 S., R. 84 E.
Geology: As described by Chapin (1919), the Gould deposit is in schist near a granite contact. Chalcopyrite, pyrite, and pyrrhotite occur both in layers parallel to the foliation in the schist and in veinlets that crosscut the foliation. There was some surface exploration in 1917. The contact is between leucosyenite of early Permian or Late Pennsylvanian age and sedimentary rocks of the Descon Formation of Silurian and Ordovician age (Eberlein and others, 1983; Brew, 1996). This contact was examined by Maas and others (1991), and while they could not find the old workings, they did find occurrences of pyrite and pyrrhotite with chalcopyrite along a mile of the contact. The sulfides occur mainly along the layering in the sedimentary rocks. Several samples were taken along the contact; the highest values were 1,187 parts per million (ppm) zinc and 485 ppm copper.
Workings: There probably was some surface work done before 1919 but the workings could not be located in 1991.
Age: Unclear whether the mineralization is related to the Silurian or Ordovician host rocks or to the adjacent Permian or Pennsylvanian leucosyenite.

Commodities (Major) - Cu, Zn
Development Status: None
Deposit Model: Unclear whether syngenetic or epigenetic.

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Link to USGS - Alaska:	CR147

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References