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
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.
Exchange MRDS details
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.
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.
