Unnamed (on southeast side of Latouche Island)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cu
Ore minerals chalcopyrite; pyrrhotite

Geographic location

Quadrangle map, 1:250,000-scale BS
Quadrangle map, 1:63,360-scale D-3
Latitude 59.98
Longitude -147.91
Nearby scientific data Find additional scientific data near this location
Location and accuracy The occurrence is located on the southeast side of Latouche Island in the E1/2 of section 28, T. 2 S., R. 9 E., of the Seward Meridian. This occurrence is described as a landslide block of unknown size (Nelson and others, 1984). This location is accurate to within a half a mile.

Geologic setting

Geologic description

The occurrence is on a landslide block of slate and graywacke of the Tertiary Orca Group which contains three beds with chalcopyrite and pyrrhotite that are conformable to the bedding. The beds are up to 2 foot wide and extend along strike for 500 feet. A 20 foot wide chip sample across all three zones contained 2.5 percent copper and 18 ppm silver (Nelson and others, 1984). Other limonite-stained rock are exposed in this area.
Geologic map unit (-147.912011980606, 59.9793410450476)
Mineral deposit model Besshi massive sulfide (Cox and Singer, 1986; model 24b).
Mineral deposit model number 24b
Age of mineralization Tertiary.

Production and reserves

Indication of production None


MRDS Number 10307302
Reporters Jeff A. Huber (Anchorage)
Last report date 3/15/1999