Ibach

The Ibach is a silver, zinc, lead, and copper 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: Ibach
Secondary: The Sure Thing 1906

Commodity

Primary: Silver
Primary: Zinc
Primary: Lead
Primary: Copper

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: Surface oxidation.

Rocks

Name: Slate
Role: Host
Age Type: Host Rock Unit
Age Young: Pliocene

Name: Slate
Role: Host
Age Type: Host Rock
Age Young: Pliocene

Analytical Data

Not available

Materials

Ore: Chalcopyrite
Ore: Pyrite
Ore: Pyrrhotite
Ore: Sphalerite

Comments

Comment (Workings): Workings / Exploration = Workings consist of an 80-foot-long adit. U.S. Bureau of Mines sampling and analysis (Jansons and others, 1984) in the area yielded the following results from five chip samples: 4 ppm to 3.4% Cu, 40 ppm to 1.95% Zn, 10 ppm to 0.26% Pb, and 3.6 to 11 ppm Ag. Four grab samples contained 0.52 to 5.5% Cu, 215 ppm to 2.4% Zn, 30 ppm to 0.28% Pb, and 0.4 ppm to 14 ppm Ag.

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

Comment (Reserve-Resource): Reserves = Inferred reserves are estimated at 3,800 tons @ 2.8% Cu, 2.2% Zn, and 10 ppm Ag (Garret, 1971).

Comment (Geology): Geologic Description = This prospect is hosted in a unit of the Tertiary Orca Group consisting mostly of tabular or lenticular bodies of mafic volcanic rocks, including pillowed or massive flows, breccia and dikes (Nelson and others, 1985). Grant and Higgins (1910) reported a vein 12-20 feet wide and two miles long in the area. Jansons and others (1984) reported a 14-foot-wide shear zone in volcanic rock containing small lenses of pyrite, pyrrhotite, chalcopyrite, and sphalerite. U.S. Bureau of Mines sampling and analysis (Jansons and others, 1984) in the area yielded the following results from five chip samples: 4 ppm to 3.4% Cu, 40 ppm to 1.95% Zn, 10 ppm to 0.26% Pb, and 3.6 to 11 ppm Ag. Four grab samples contained 0.52 to 5.5% Cu, 215 ppm to 2.4% Zn, 30 ppm to 0.28% Pb, and 0.4 ppm to 14 ppm Ag.

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

Comment (Deposit): Other Comments = Ibeck Creek is (mis)named for Joe (?) Ibach, an early prospector in the area. Chugach Alaska Corporation, Anchorage, Alaska has control of these lands.

Comment (Exploration): Status = Inactive

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

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, scale 1:250,000.

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): Grant, U.S., and Higgins, D.F., Jr., 1910, Reconnaissance of the geology and mineral resources of Prince William Sound, Alaska: U.S. Geological Survey Bulletin 443, 89 p.

Reference (Deposit): Garrett, C.R., Jr., 1971, Report of mineral examination-Hartney Bay: U.S. Department of Agriculture, Forest Service, Alaska Region, Report R10-26, 14 p.

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.