Unnamed Occurrence (ARDF - SR222; Chenega Island), Prince William Sound Mining District, Valdez-Cordova Census Area, Alaska, USAi

Regional Level Types
Unnamed Occurrence (ARDF - SR222; Chenega Island)	- not defined -
Prince William Sound Mining District	Mining District
Valdez-Cordova Census Area	Census Area
Alaska	State
USA	Country

Location: The occurrence is located at tidewater in a small bay on the northeast shore of Chenega Island. It is in the NW1/4 section 12, T. 3 N., R. 8 E., of the Seward Meridian. This is location S-90 of Jansons and others (1984). This location is accurate to within a quarter of a mile.
Geology: The occurrence consists of a resistant calcareous chert bed that is exposed between the beach gravel and muskeg vegetation. The exposure is 6 feet wide by 50 feet long; the bed strikes N10E and dips 80W (Kurtak and Jeske, 1986). The chert is interbedded with calcareous shale and phyllite. Manganese minerals in the chert include rhodochrosite and pyroxmangite. Other minerals include magnetite, pyrrhotite, and a trace of pyrite (Kurtak and Jeske, 1986). The bedrock in this area is Orca Group of early Teriary age (Nelson and others, 1985). A 3.5-foot-wide chip sample contained 17 percent manganese; two grab samples contained 36 and 37 percent manganese (Kurtak and Jeske, 1986).
Workings: A 3.5-foot-wide chip sample contained 17 percent manganese; two grab samples contained 36 and 37 percent manganese (Kurtak and Jeske, 1986). No workings or improvements are present.
Age: Tertiary or younger; the mineralization is in rocks of the Orca Group of Tertiary age.
Reserves: Inferred reserves are 700 tons of ore at an unknown grade (Kurtak, 1982).

Commodities (Major) - Mn
Development Status: None
Deposit Model: Volcanogenic Mn (Cox and Singer, 1986; model 24c)

Other Databases

Link to USGS - Alaska:	SR222

Other Regions, Features and Areas containing this locality

References