Lost Anchor

Occurrence, Probably inactive

Commodities and mineralogy

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

Geographic location

Quadrangle map, 1:250,000-scale SI
Quadrangle map, 1:63,360-scale B-3
Latitude 57.3158
Longitude -134.855
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at sea level on the southwest shore of Catherine Island, about 1.8 miles north-northwest of North Point. The occurrence is 0.7 mile south-southwest of the northeast corner of sec. 32, T. 52 S., R. 66 E. It is location P-101 of Bittenbender and others (1999) and MAS no. 0021140153 (U.S. Bureau of Land Management, 2002). The location is accurate within 0.5 mile.

Geologic setting

Geologic description

The rocks in the vicinity of this occurrence are part of the Jurassic and/or Triassic, Kelp Bay Group which consists of phyllite, quartzite, greenschist, greenstone, graywacke, and semischist (Loney and others, 1975). The rocks in this area are marked by the development of an intense cataclastic foliation. Bittenbender and others (1999) collected 5 samples along the shoreline of quartz veins that contain rare chalcopyrite, pyrite, and up to 2 percent pyrrhotite. The samples contained less than 5 parts per billion gold and up to 4,060 parts per million copper; all other of the common metallic elements were at background level.
Geologic map unit (-134.856758388375, 57.3154629260983)
Mineral deposit model Quartz vein with copper minerals.
Age of mineralization Triassic or younger based on the age of the host rock.

Production and reserves

Workings or exploration Apparently only sampling by government geologists.
Indication of production None