Unnamed (between arms of Castle Bay)

Occurrence in Alaska, United States with commodities Copper, Silver, Molybdenum

Geologic information

Identification information

Deposit ID 10307315
Record type Site
Current site name Unnamed (between arms of Castle Bay)

Geographic coordinates

Geographic coordinates: -158.31244, 56.20929 (WGS84)
Relative position 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.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary
Silver Secondary
Molybdenum Secondary

Materials information

Materials Type of material
Chalcopyrite Ore
Molybdenite Ore

Mineral occurrence model information

Model code 53
USGS model code 17
Deposit model name Porphyry Cu
Mark3 model number 4

Nearby scientific data

(1) -158.31244, 56.20929

Comments on the geologic information

  • 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.
  • Age = Tertiary.

Economic information

Economic information about the deposit and operations

Development status Occurrence

Comments on exploration

  • Status = Inactive

Mining district

District name Alaska Peninsula

Comments on the workings information

  • Workings / Exploration = Bear Creek Mining Company did limited exploration at this occurrence during the period 1975-1976.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Alaska Resource Data File ARDF CG017

Bibliographic references

  • Deposit

    Fields, E.D., 1977, 1976 Annual report: Alaska search, Chignik area-Bristol Bay region: Bear Creek Mining Company, 44 p., 22 map sheets. (Report held by the Aleut Corporation, Anchorage, Alaska.)

  • Deposit

    MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous mineral deposits in the western part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-F, 38 p., 1 sheet, scale 1:1,000,000.

Comments on the references

  • Primary Reference = Fields, 1977

General comments

Subject category Comment text
Deposit Model Name = Porphyry copper? (Cox and Singer, 1986; model 17)
Deposit Other Comments = This site is located on land conveyed to or patented by the Bristol Bay Native Corporation.

Reporter information

Type Date Name Affiliation Comment
Reporter 08-FEB-00 S.H. Pilcher U.S. Geological Survey