Exchange

The Exchange is a gold 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

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Site Name

Primary: Exchange

Commodity

Primary: Gold

Location

State: Alaska
District: Petersburg

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

Not available

Orebody

Not available

Structure

Not available

Alterations

Not available

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Sphalerite
Ore: Pyrite
Ore: Gold
Ore: Galena
Gangue: Quartz

Comments

Comment (Deposit): Model Name = Gold quartz vein

Comment (Geology): Geologic Description = Quartz vein 12-15 feet thick in granite contains sparse pyrite and moderate values in gold. Opened by two adits and open cuts (Wright and Wright, 1908; Roehm, 1945 [IR 195-37]). Brew (1997 [OF 97-156-D]) has mapped the rocks in the vicinity as Cretaceous low- to medium-grade schist and semischist derived from Cretaceous-Jurassic Seymour Canal Formation sedimentary rocks. However, that mapping was more regional than detailed and descriptions of the deposit invariably show it as being in felsic plutonic rocks variously described as granite or syenite.

Comment (Exploration): Status = Active?

Comment (Workings): Workings / Exploration = The property was first staked in 1900 and developed by surface trenches and some underground workings that include a crosscut 45 feet long. Two of the claims were restaked in 1974, were active through at least 1982, and are probably still active in 1996.

Comment (Reference): Primary Reference = Roehm, 1945 (IR 195-37)

Comment (Production): Production Notes = No record of production.

References

Reference (Deposit): U.S. Bureau of Mines, 1980, Claim map, Petersburg quadrangle, Alaska: U.S. Bureau of Mines Map 117, 1 sheet, scale 1:250,000.

Reference (Deposit): Grybeck, D.J., Berg, H.C., and Karl, S.M., 1984, Map and description of the mineral deposits in the Petersburg and eastern Port Alexander quadrangles: U.S. Geological Survey Open-File Report 84-837, 86 p., 1 sheet, scale 1:250,000.

Reference (Deposit): Brew, D.A., 1997, Reconnaissance geologic map of the Petersburg B-2 quadrangle, southeastern Alaska: U.S. Geological Survey Open-File Report 97-156-D, 21 p., 1 sheet, scale 1:63,360.

Reference (Deposit): Cobb, E.H., 1972, Metallic mineral resources map of the Petersburg quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-415, 1 sheet, scale 1:250,000.

Reference (Deposit): Cobb, E.H., 1978, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Petersburg quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-870, 53 p.

Reference (Deposit): Wright, F.E., and Wright, C.W., 1905, Economic developments in southeastern Alaska: U.S. Geological Survey Bulletin 259, p. 47-68.

Reference (Deposit): Wright, F.E., and Wright, C.W., 1908, The Ketchikan and Wrangell mining districts, Alaska: U.S. Geological Survey Bulletin 347, 210 p.

Reference (Deposit): Roehm, J.C., 1945, Preliminary report of investigations and itinerary of J. C. Roehm in the Wrangell and Petersburg precincts, Alaska: Teritory of Alaska, Department of Mines Itinerary Report 195-37, 13 p.

Reference (Deposit): Cobb, E. H., 1972, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Petersburg Quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-870, 53 p.

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