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Threeman (Standard Copper)

Past Producer in Alaska, United States with commodities Copper, Zinc, Silver, Gold, Cobalt
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Materials information
  7. Mineral occurrence model information
  8. Nearby scientific data
  9. Economic information about the deposit and operations
  10. Mining district
  11. Links to other databases
  12. Bibliographic references
  13. General comments
  14. Reporter information

Geologic information

Identification information

Deposit ID 10307359
Record type Site
Current site name Threeman (Standard Copper)

Geographic coordinates

Geographic coordinates: -146.53954, 60.85459 (WGS84)
Relative position The mine is at an elevation of about 300 feet above the north shore of inner Landlocked Bay, and about 0.25 mile north-northeast of VABM Dick. It is in the S1/2 sec. 6, T. 12 S., R. 7 W., of the Copper River Meridian. The site location is accurate to within 1000 ft. The location corresponds to site C-73 in Jansons and others (1984) and to #14 in Cobb (1972: MF-392).

Site location context

Political divisions (FIPS codes)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Cordova D-7 SW(quadrangle 1:24,000 scale)

Cordova NW(quadrangle 1:100,000 scale)

Cordova(quadrangle 1:250,000 scale)

Federal lands

Chugach National Forest(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary
Zinc Critical Primary
Silver Secondary
Gold Secondary
Cobalt Critical Secondary

Materials information

Materials Type of material
Chalcopyrite Ore
Cubanite Ore
Galena Ore
Pyrite Ore
Pyrrhotite Ore
Sphalerite Ore

Mineral occurrence model information

Model code 90
USGS model code 24a
Deposit model name Massive sulfide, Cyprus
Mark3 model number 11

Nearby scientific data

(1) -146.53954, 60.85459
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = The deposit at this mine is in mafic volcanic and sedimentary rocks of the Tertiary Orca Group (Nelson and others, 1985). It consists of two sulfide lenses up to about 6 ft wide and over 300 ft. long in pillow basalt and sedimentary rocks (Mihelich and Wells, 1957). Sulfide minerals include chalcopyrite, cubanite, galena, pyrite, pyrrhotite, and sphalerite. Chip and grab samples contained 53 ppm to 5.25% Cu, 40 ppm to 2.85% Zn, <0.02 ppm to 0.10 ppm Au, <1 ppm to 22 ppm Ag, and 5 to 700 ppm Co (Jansons and others, 1984). Sixteen chip samples taken in 1955 contained 0.3 % to 8.6% Cu, 0.05% to 0.64% Zn, trace to 0.07 oz.Au/ton and trace to 0.78 oz. Ag/ton (Mihelich and Wells, 1957).
  • Age = Probably Tertiary baased on the age of the host rocks.

Economic information about the deposit and operations

Development status Past Producer

Comments on exploration

  • Status = Inactive

Mining district

District name Copper River

Comments on the production information

  • Production Notes = 1,159,660 lbs. Cu, 101 oz. Au, 5,308 oz. Ag from 6,196.5 tons ore (Mihelich and Wells, 1957).

Comments on the reserve resource information

  • Reserves = Inferred reserves of 1,902,000 tons @ 1.05% Cu (Sainsbury, 1953).

Comments on the workings information

  • Workings / Exploration = There are several thousand feet of workings on three levels. Three adits were caved when visited by this reporter in 1974 and 1986 (also see Sainsbury, 1993). Chip and grab samples contained 53 ppm to 5.25% Cu, 40 ppm to 2.85% Zn, <0.02 ppm to 0.10 ppm Au, <1 ppm to 22 ppm Ag, and 5 to 700 ppm Co (Jansons and others, 1984). Sixteen chip samples taken in 1955 contained 0.3 % to 8.6% Cu, 0.05% to 0.64% Zn, trace to 0.07 oz.Au/ton and trace to 0.78 oz. Ag/ton (Mihelich and Wells, 1957).

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Mihelich and Wells, 1957

General comments

Subject category Comment text
Deposit Model Name = Cyprus massive sulfide (Cox and Singer, 1986; model 24a)
Deposit Other Comments = Nelson and others (1985) interpret the country rocks as accreted ocean crust. Crowe and others (1992; 1993) and Sainsbury (1993) discuss the genesis of the volcanogenic massive sulfide deposits in this area.. Chugach Alaska Corporation, Anchorage, Alaska has control of these lands.

Reporter information

Type Date Name Affiliation Comment
Reporter 10-JUN-00 S.W. Nelson U.S. Geological Survey

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

Maps centered on this site

Authoritative Alaska resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.