Unnamed (South Arm, Kelp Bay)

Occurrence, Undetermined

Commodities and mineralogy

Main commodities Au; Cu; Zn
Ore minerals bornite; chalcopyrite; covellite; pyrite; pyrrhotite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale SI
Quadrangle map, 1:63,360-scale B-4
Latitude 57.2747
Longitude -135.0154
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at sea level on the west side of the South Arm of Kelp Bay, about 1.3 miles from the head of the bay. The occurrence is 0.5 mile south-southeast of the northwest corner of sec. 13, T. 53 S., R. 65 E. It is location P-103 of Bittenbender and others (1999), location 63 of Cobb (1972, 1978), and MAS no. 0021140190 (U.S. Bureau of Land Management, 2002). The location is accurate within 0.2 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). Loney and others (1963) noted pyrite, chalcopyrite, covellite, and bornite in quartz veins and iron-stained siliceous rocks in this area. Bittenbender and others (1999) collected two samples here: 1) mudstone and tuff with 5 percent pyrite and pyrrhotite, and 2) altered metavolcanic rock with minor chalcopyrite and pyrite. The samples contained less than 5 parts per billion gold, 128 and 485 parts per million (ppm) copper, and 164 and 310 ppm zinc; all of the other common metallic elements were at background level.
Geologic map unit (-135.017159838627, 57.2743564083475)
Age of mineralization Triassic or younger based on the age of the host rocks.
Alteration of deposit Unspecified alteration of metavolcanic rocks.

Production and reserves

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

References