Unnamed (east shore Latouche Island)

Prospect, Inactive

Commodities and mineralogy

Main commodities Cu; Zn
Ore minerals chalcopyrite; pyrrhotite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale SR
Quadrangle map, 1:63,360-scale A-3
Latitude 60.0226
Longitude -147.8468
Nearby scientific data Find additional scientific data near this location
Location and accuracy The prospect is located in the NE1/4 section 11, T. 2 S., R. 9 E., of the Seward Meridian, at an elevation of 10 feet. It is on the southeast side of Latouche Island, about 1.5 miles northeast of Reynolds Peak. This is location S-10 of Jansons and others (1984). This location is accurate to within a quarter of a mile.

Geologic setting

Geologic description

The prospect consists of a mineralized shear zone with massive pyrrhotite on the hanging wall and as much as 15 percent chalcopyrite within quartz veins in the shear zone (Kurtak and Jeske, 1986). The shear zone is 3.5 to 4.5 feet wide, trends N 40 E, and dips 34 W. The host rock is silicified slate and sandstone of the Orca Group of early Tertiary age (Nelson and others, 1985).
Workings on the prospect consist of a single 64-foot adit just above the shoreline. The adit has been driven along the shear zone. A 5-foot-wide chip sample of the shear zone in the adit contained 0.74 percent copper and 0.19 percent zinc (Kurtak and Jeske, 1986).
Geologic map unit (-147.848794151145, 60.0219504244606)
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.
Alteration of deposit Slate and graywacke wallrocks of the mineralized shear zone are silicified (Kurtak and Jeske, 1986).

Production and reserves

Workings or exploration Workings consist of a single 64-foot adit near the shoreline. A five-foot-wide chip sample of the shear zone in the adit contained 0.74 percent copper and 0.19 percent zinc (Kurtak and Jeske, 1986).
Indication of production None
Reserve estimates The U.S. Bureau of Mines has estimated inferred reserves of 100 tons of material containing 0.74 percent copper and 0.19 percent zinc (Kurtak and Jeske, 1986).

References