The Unnamed (on western side of Brooks Mountain) is a 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.
Unnamed (on western side of Brooks Mountain) MRDS details
Site Name
Primary: Unnamed (on western side of Brooks Mountain)
Commodity
Secondary: Lead
Secondary: Uranium
Location
State: Alaska
District: Port Clarence
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: Sn skarn
Orebody
Not available
Structure
Not available
Alterations
Alteration Type: L
Alteration Text: Tactite in carbonate rocks, quartz-tourmaline veining in granite, and secondary oxide development.
Rocks
Role: Associated
Age Type: Associated Rock
Age in Years: 77.000000+-3.000000
Age Young: Late Cretaceous
Analytical Data
Not available
Materials
Ore: Galena
Gangue: Tourmaline
Gangue: Idocrase
Gangue: Calcite
Comments
Comment (Geology): Age = Chronological age is for Brooks Mountain.
Comment (Exploration): Status = Inactive
Comment (Geology): Geologic Description = Brooks Mountain granite stock is a 1 by 2 mile composite intrusion just south and east of Brooks Mountain (elevation 2,898 feet), the highest part of the York Mountains. The country rocks to the Late Cretaceous (77.0 +/- 3.0 my; Hudson and Arth, 1983, p. 769) Brooks Mountain granite are Ordovician limestone and locally fine-grained, carbonaceous metaclastic rock of unknown but probable Paleozoic age. Tactite is common in marble nearby to the granite contact on the northwest and southwest sides of the stock (Sainsbury, 1969, plate 1). Hornfels is developed in the nearby metaclastic rocks. The granite is dominately seriate and prophyritic types (Hudson and Arth, 1983, p. 770) that are not known to be directly linked with significant tin metallization in the western Seward Peninsula tin belt; they are instead precusor-type granites (Hudson and Reed, 1997, figure 3). Tactite here contains much idocrase and some tourmaline. It forms irregular masses and green-colored seams along fractures in marble. Small cubes of galena are present in open vugs in the tactite. About 700 feet to the southeast, the Brooks Mountain granite contains 1 to 4 inch wide quartz-tourmaline veins along joints. Uranium (to 1% eU) is present in zuenerite associated with hematite coatings on vein and fracture surfaces (West and White, 1952).
Comment (Workings): Workings / Exploration = Some surface pits have been dug here.
Comment (Reference): Primary Reference = West and White, 1952
Comment (Geology): Age = the age of the mineralization is assumed to be similar to the age of the Brooks Mountain granite (77.0 +/- 3.0 my; Hudson and Arth, 1983, p. 769).
Comment (Reserve-Resource): Reserves = Not defined
Comment (Deposit): Model Name = This is an area of variable contact metamorphism of Ordovician limestone by the Brooks Mountain granite stock. Possibly tin skarn (Cox and Singer, 1986; model 14b)
References
Reference (Deposit): Sainsbury, C.L., 1969, Geology and ore deposits of the central York Mountains, western Seward Peninsula, Alaska: U.S. Geological Survey Bulletin 1287, 101 p.
Reference (Deposit): Cobb, E.H., 1975, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Teller quadrangle, Alaska: U.S. Geological Survey Open-File Report 75-587, 130 p.
Reference (Deposit): West, W.S., and White, M.G., 1952, The occurrence of zeunerite at Brooks Mountain, Seward Peninsula, Alaska: U.S. Geological Survey Circular 214, 7 p.
Reference (Deposit): Cobb, E.H., 1975, Tungsten occurrences in Alaska: U.S. Geological Survey Mineral Investigations Resource Map MR-66, 1 sheet, scale 1:250,000.
Reference (Deposit): Hudson, T.L., and Arth, J. G., 1983, Tin-granites of Seward Peninsula, Alaska: Geological Society of America Bulletin, v. 94, p. 768-790.
Reference (Deposit): Hudson, T.L., and Reed, B.L., 1997, Tin deposits of Alaska, in Goldfarb, R.J., and Miller, L.D., eds., Mineral Deposits of Alaska: Economic Geology Monograph 9, p. 450-465.
Reference (Deposit): Cobb, E.H., and Sainsbury, C.L., 1972, Metallic mineral resource map of the Teller quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-426, 1 sheet, scale 1:250,000.
Reference (Deposit): Patton, T.L., and Robinson, M.S., 1975, Bedrock geology, geochemistry, and geophysics of Brooks Mountain, Seward Peninsula, Alaska: University of Alaska, Fairbanks, M.Sc. thesis, 106 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.
