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Threeman Mining Co.

Prospect in Alaska, United States with commodities Copper, Zinc, Silver
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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. Alteration
  8. Mineral occurrence model information
  9. Nearby scientific data
  10. Economic information about the deposit and operations
  11. Mining district
  12. Links to other databases
  13. Bibliographic references
  14. General comments
  15. Reporter information

Geologic information

Identification information

Deposit ID 10307360
Record type Site
Current site name Threeman Mining Co.
Alternate or previous names Billygoat Mountain

Geographic coordinates

Geographic coordinates: -146.51953, 60.82559 (WGS84)
Relative position This prospect is at an elevation of about 900 feet, about 0.25 mile south of the summit of Billygoat Mountain. It is in the SW1/4 sec. 17, T. 12 S., R. 7 W., of the Copper River Meridian. The location of the site is accurate to within 1000 ft. This prospect is shown as site C-68 by Janson and others (1984) and as #18 by Cobb (1972: MF-392).

Site location context

Political divisions (FIPS codes)

Valdez-Cordova(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Cordova D-7(quadrangle 1:63,360 scale)

Cordova NW(quadrangle 1:100,000 scale)

Cordova(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Eastern Prince William Sound(hydrologic unit)

Prince William Sound(hydrologic accounting unit)

South Central Alaska(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

Tatitlek Corporation(ANCSA Village)

ANCSA Village NTVPIC(Type of land area)

NTVPIC(Federal land areas administered by NTVPIC)

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

Materials information

Materials Type of material
Chalcopyrite Ore
Pyrite Ore
Pyrrhotite Ore

Alteration

  • (Local) Local oxidation of sulfide minerals.

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) Togv
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = This prospect consists of two sulfide-bearing shear zones in mafic volcanic rocks of the Tertiary Orca Group (Nelson and others, 1985). The zones range in width from a few inches to five feet and contain lenses and stringer zones of chalcopyrite, pyrite, and pyrrhotite. Samples grade up to 6% Cu (Capps and Johnson, 1913). Capps and Johnson (1913) reported adits at 1150 ft. and 1750 ft. elevation. The lower adit was 30 ft. long and the upper adit was 70 ft. long. Jansons and others (1984) reported that a grab sample from the 70 ft. adit contained 3.8% Cu, 0.2% Zn, and 7.5 ppm Ag. Gossan from the area contained 1.55% Cu, 0.4% Zn, and 13 ppm Ag.
  • Age = Tertiary based on the age of the host rocks.

Economic information about the deposit and operations

Development status Prospect

Comments on exploration

  • Status = Inactive

Mining district

District name Copper River

Comments on the workings information

  • Workings / Exploration = Capps and Johnson (1913) reported adits at 1150 ft. and 1750 ft. elevation. The lower adit was 30 ft. long and the upper adit was 70 ft. long. Jansons and others (1984) reported that a grab sample from the 70 ft. adit contained 3.8% Cu, 0.2% Zn, and 7.5 ppm Ag. Gossan from the area contained 1.55% Cu, 0.4% Zn, and 13 ppm Ag.

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Jansons and others, 1984

General comments

Subject category Comment text
Deposit Model Name = Cyprus massive sulfide (Cox and Singer, 1986; model 24a)
Deposit Other Comments = 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.