Unnamed (between arms of Castle Bay)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cu
Other commodities Ag; Mo
Ore minerals chalcopyrite; molybdenite

Geographic location

Quadrangle map, 1:250,000-scale CG
Quadrangle map, 1:63,360-scale A-1
Latitude 56.21
Longitude -158.31
Nearby scientific data Find additional scientific data near this location
Location and accuracy This site is located approximately on the point between the northwest and southwest arms of Castle Bay (MacKevett and Holloway, 1977, locality 26). Site location is accurate to within 2 miles.

Geologic setting

Geologic description

This site is described as an altered zone in Tertiary intrusive and volcanic rocks (MacKevett and Holloway, 1977). Fields (1977) reports a 3/4-square-mile color anomaly associated with a small quartz diorite body in this general area. A silt sample collected by Bear Creek Mining Company from a northeast-flowing drainage approximately 1 mile west of the site as plotted contained 138 ppm copper and 3.4 ppm molybdenum. Sparse chalcopyrite was noted in quartz diorite boulders.
Geologic map unit (-158.312028679315, 56.2092237488034)
Mineral deposit model Porphyry copper? (Cox and Singer, 1986; model 17).
Mineral deposit model number 17?
Age of mineralization Tertiary.

Production and reserves

Workings or exploration Bear Creek Mining Company did limited exploration at this occurrence during the period 1975-1976.
Indication of production None

Additional comments

This site is located on land conveyed to or patented by the Bristol Bay Native Corporation.


MRDS Number 10307315
Reporters S.H. Pilcher (Anchorage)
Last report date 2/8/2000