Islander Prospect, Petersburg Mining District, Hoonah-Angoon Census Area, Alaska, USAi

Regional Level Types
Islander Prospect	Prospect
Petersburg Mining District	Mining District
Hoonah-Angoon Census Area	Census Area
Alaska	State
USA	Country

Location: The Islander prospect is on a small peninsula near the center of the head of Steamboat Bay; it is near the northwest corner of section 21, T. 53 S., R. 75 E.
Geology: The Islander prospect was first staked in 1952 and there has been intermittent work on it since (Williams, 1952 [PE 115-04]). The deposit is in graywacke of Cretaceous or Jurassic age (Gehrels and Berg, 1992). The graywacke is cut by thin, discontinuous carbonate stringers that locally contain abundant pyrite and sphalerite. The stringers vary in strike from N55W to N85W and dip from 24 to 79S. The better gold values tend to be in the stringers with steeper dips. Williams (1952 [PE 115-04]) collected five samples of carbonate stringers 3 to 12 inches thick. They contained 0.16 to 0.48 ounce of gold per ton, and 1.19 to 7.5 percent zinc. One sample of a 11-foot-long veinlet collected by Still and others (2002) contained 7.352 parts per million (ppm) gold, more than 5 percent zinc, and anomalous copper, cadmium, and mercury. Another sample 19 feet long contained 1.077 ounces of gold per ton, 7 percent zinc, and more than 10,000 ppm arsenic. There is a similar prospect about 0.5 mile northwest on the northeast side of Foot Island and another just to the south on the southeast shore of Steamboat Bay.
Workings: Apparently only surface prospecting or small pits by private interests and sampling by government geologists.
Age: The auriferous carbonate veinlets are younger than the Jurassic to Cretaceous host rock.

Commodities (Major) - Au, Zn; (Minor) - As, Cd, Cu, Hg
Development Status: None
Deposit Model: Carbonate veinlets in graywacke with gold and zinc.

Other Databases

Link to USGS - Alaska:	SD059

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References