Unnamed (Northwest part of Yakobi Island)

The Unnamed (Northwest part of Yakobi Island) is a pge, nickel, 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: Unnamed (Northwest part of Yakobi Island)

Commodity

Primary: PGE
Primary: Nickel
Primary: Copper

Location

State: Alaska
District: Chicagof

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

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

Physiography

Not available

Mineral Deposit Model

Not available

Orebody

Not available

Structure

Not available

Alterations

Not available

Rocks

Not available

Analytical Data

Not available

Materials

Not available

Comments

Comment (Deposit): Model Name = Igneous-affiliated deposit, mafic to ultramafic.

Comment (Deposit): Other Comments = the gabbro body is in the West Chichagof-Yakobi Island Wilderness Area of the Tongass National Forest.

Comment (Geology): Geologic Description = A gabbro body on northern Yakobi Island is geologically permissive for nickel-copper deposits similar to those that occur at Takanis and Bohemia Basin in the Sitka D-8 quadrangle, about two miles south of the southern boundary of the Mt. Fairweather A-2 quadrangle. (The gabbro body on Mt. Fairweather A-2 quadrangle is about 6 miles northwest of the Takanis nickel-copper deposit.) the structural setting on the northwest part of Yakobi Island is the same as at Bohemia Basin where barren and ore- bearing gabbro occur within the same large dike-like intrusion of non-foliated light colored sodic quartz diorite of Tertiary age that hosts the gabbro body on Fairweather A-2. The dike-like quartz diorite mass crops out for about seven miles on the Mt. Fairweather quadrangle; to the south, it thickens, becomes more complex, and extends into the Sitka quadrangle for about ten more miles (Rossman, 1959, plate 12; Loney and others, 1975, plates 1 and 2). The eastern part of the gabbro body on northern Yakobi Island is on the mainland of the island; much of the body is on an offshore island complex. Nickel-bearing norite gabbro is unknown at the occurrence, but the intrusion is large enough to host nickel-copper deposits in the body, especially the part exposed on small islands and largely covered by sea water.

Comment (Exploration): Status = Inactive

Comment (Geology): Age = Tertiary.

Comment (Reference): Primary Reference = Rossman, 1959 (B 1058-E)

Comment (Workings): Workings / Exploration = None.

References

Reference (Deposit): Rossman, Darwin, 1959, Geology and ore deposits of the northwestern part of Chichagof Island, Alaska: U.S. Geological Survey Bulletin 1058-E, p. 139-216.

Reference (Deposit): Loney, R.A., Brew, D.A., Muffler, L.J. B., and Pomeroy, J.S., 1975, Reconnaissance geology of Chichagof, Baranof, and Kruzof Islands, southeastern Alaska: U.S. Geological Survey Professional Paper 792, 105 p.

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.