Unnamed (on Swanson Bay, Bainbridge Island)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cu; Zn
Ore minerals pyrite; pyrrhotite

Geographic location

Quadrangle map, 1:250,000-scale SR
Quadrangle map, 1:63,360-scale A-4
Latitude 60.0348
Longitude -148.1964
Nearby scientific data Find additional scientific data near this location
Location and accuracy The occurrence is located on the south side of the head of Swanson Bay, which is in the southern part of Bainbridge Island. It is in the NE1/4 section 2, T. 2 S., R. 7 E., of the Seward Meridian. This is location 275 of Tysdal (1978 [MF-880-A]) and location S-22 of Jansons and others (1984). This location is accurate to within 300 feet.

Geologic setting

Geologic description

The occurrence consists of as much as 1 percent disseminated pyrite and pyrrhotite in basaltic greenstone and siliceous shale and slate. Samples from the occurrence contained as much as 100 ppm copper and 200 ppm zinc (Kurtak and Jeske, 1986). Nelson and others (1985) mapped bedrock in this area as Orca Group of early Tertiary age.
Geologic map unit (-148.198438340785, 60.0341464572131)
Mineral deposit model Besshi massive sulfide (Cox and Singer, 1986; model 24b)
Mineral deposit model number 24b
Age of mineralization Tertiary or younger; the mineralization is in rocks of the Orca Group of Tertiary age.

Production and reserves

Workings or exploration Samples from the occurrence contained as much as 100 ppm copper and 200 ppm zinc (Kurtak and Jeske, 1986).
Indication of production None

References