Threeman Mining Co.

The Threeman Mining Co. is a copper and zinc mine located in Alaska.

About the MRDS Data:

All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.

Mine Info

Satelite View

MRDS mine locations are often very general, and in some cases are incorrect. Some mine remains have been covered or removed by modern industrial activity or by development of things like housing. The satellite view offers a quick glimpse as to whether the MRDS location corresponds to visible mine remains.

Site Name

Primary: Threeman Mining Co.
Secondary: Billygoat Mountain

Commodity

Primary: Copper
Primary: Zinc
Secondary: Silver

Location

State: Alaska
District: Copper River

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Prospect
Operation Type: Unknown
Years of Production:
Organization:
Significant:

Physiography

Not available

Mineral Deposit Model

Model Name: Massive sulfide, Cyprus

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Local oxidation of sulfide minerals.

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Pyrrhotite
Ore: Pyrite
Ore: Chalcopyrite

Comments

Comment (Deposit): Model Name = Cyprus massive sulfide (Cox and Singer, 1986; model 24a)

Comment (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.

Comment (Geology): 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.

Comment (Geology): Age = Tertiary based on the age of the host rocks.

Comment (Reference): Primary Reference = Jansons and others, 1984

Comment (Exploration): Status = Inactive

Comment (Workings): 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.

References

Reference (Deposit): Nelson, S.W., Dumoulin, J. A., and Miller, M.L., 1985, Geologic map of the Chugach National Forest, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1645-B, 16 p., 1 sheet, scale 1:250,000.

Reference (Deposit): Crowe, D.E., Nelson, S.W., Brown, P.E., Shanks III, W.C., and Valley, J.W., 1992, Geology and geochemistry of volcanogenic massive sulfide deposits and related igneous rocks, Prince William Sound, south-central Alaska: Economic Geology, v. 87, p. 1722-1746.

Reference (Deposit): Crowe, D.E., Nelson, S.W., Brown, P.E., Shanks III, W.C., and Valley, J.W., 1993, Geology and geochemistry of volcanogenic massive sulfide deposits and related igneous rocks, Prince William Sound, south-central Alaska-A reply: Economic Geology, v. 88, p. 1285-1288.

Reference (Deposit): Capps, S.R., and Johnson, B.L., 1913, Mineral deposits of the Ellamar district: U.S. Geological Survey Bulletin 542, p. 86-124.

Reference (Deposit): Cobb, E.H., 1972, Metallic mineral resources map of the Cordova quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-392, 1 sheet, scale 1:250,000.

Reference (Deposit): Sainsbury, C.L., 1993, Geology and geochemistry of volcanogenic massive sulfide deposits and related igneous rocks, Prince William Sound, south-central Alaska, A discussion: Economic Geology, v. 88, p. 1284-1285.

Reference (Deposit): Jansons, Uldis, Hoekzema, R.B., Kurtak, J.M., and Fechner, S.A., 1984, Mineral occurrences in the Chugach National Forest, Southcentral Alaska: U.S. Bureau of Mines Open-File Report 5-84, 218 p., 2 sheets, scale 1:250,000.

The Top Ten Gold Producing States

These ten states contributed the most to the gold production that built the West from 1848 through the 1930s. The Top Ten Gold Producing States.