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Foggy Day

Prospect in Alaska, United States with commodities Silver, Lead, Uranium
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Materials information
  7. Alteration
  8. Mineral occurrence model information
  9. Host and associated rocks
  10. Nearby scientific data
  11. Economic information about the deposit and operations
  12. Mining district
  13. Links to other databases
  14. Bibliographic references
  15. General comments
  16. Reporter information

Geologic information

Identification information

Deposit ID 10308419
Record type Site
Current site name Foggy Day
Alternate or previous names Read, Paigite, Cameron

Geographic coordinates

Geographic coordinates: -167.15941, 65.51827 (WGS84)
Relative position Several mineral occurrences are located on west-facing slopes peripheral to the Brooks Mountain granite stock in the headwaters of a southeast tributary to the Mint River. Mint River flows northward from its headwaters along the continental divide in the York Mountains. This prospect area is downslope to the west of the continental divide at an approximate elevation of 1,750 feet. Prospects included in this area are Foggy Day, Cameron, Read, and Paigite (West and White, 1952, plate 1). This area was shown as locality 11 of Cobb and Sainsbury (1972) and Cobb (1975) summarized relevant references under the name 'Brooks Mtn.'.

Site location context

Political divisions (FIPS codes)

Nome(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Teller C-5(quadrangle 1:63,360 scale)

Teller NE(quadrangle 1:100,000 scale)

Teller(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Imuruk Basin(hydrologic unit)

Norton Sound(hydrologic accounting unit)

Northwest(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

Diomede Native Corporation(ANCSA Village)

ANCSA Village NTVPIC(Type of land area)

NTVPIC(Federal land areas administered by NTVPIC)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Secondary
Lead Secondary
Uranium Secondary

Comments on the commodity information

  • Gangue = Complex mineralogy characterizes assemblages

Materials information

Materials Type of material
Galena Ore
Zeunerite Ore

Alteration

  • (Local) Primarily calc-silicate tactite development but with significant associated boron metasomatism.

Mineral occurrence model information

Model code 43
USGS model code 14b
Deposit model name Sn skarn

Host and associated rocks

  • Host or associated Associated
    Rock type
    Rock unit name Brooks Mountain
    Stratigraphic age (youngest) Late Cretaceous
    Chronological age 77

Nearby scientific data

(1) Klgr
ListMap

Economic information

Comments on the geologic information

  • 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). The mineralization in this area is associated with contact metamorphic rocks developed in Ordovician limestone peripheral to the southwest contact of the Brooks Mountain granite stock. Complex mineralogy characterizes the occurrences here. Tactite forms seams and irregular masses in crystalline marble; idocrase, garnet, diopside, augite, hedenbergite, phlogopite, and fluorite are present in the tactite. Sulfide minerals, dominately galena, include pyrrhotite, stannite, sphalerite, pyrite, arsenopyrite, chalcopyrite, chalcocite, and bornite. Other minerals include scapolite, chrondrodite, siderophyllite, tourmaline, scheelite, ludwigite, magnetite, hematite, limonite, cerussite, azurite, malachite, paigite, and hulsite. Zuenerite is locally present in association with hematite in oxidized granite adjacent to marble. This is primarily an area of interesting mineral occurrences although selected samples of galena-rich material assayed 34% lead and 11 opt silver (Knopf, 1908, p. 42-43) and zuenerite-rich material contained up to 2.14% eU (West and White, 1952, p. 4).
  • Ore Material = but complex mineralogy characterizes this area
  • 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).
  • Age = Chronological age is for Brooks Mountain.

Economic information about the deposit and operations

Development status Prospect

Comments on exploration

  • Status = Inactive

Mining district

District name Port Clarence

Comments on the reserve resource information

  • Reserves = Not defined

Comments on the workings information

  • Workings / Exploration = Several surface pits and some dozer trenches have been completed here.

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Knopf, 1908 (USGS B 358); West and White, 1952

General comments

Subject category Comment text
Deposit Model Name = This is an approximate 1,500 by 3,000 foot area of variable contact metamorphism of Ordovician limestone near the contract of the Brooks Mountain granite stock. Possibly tin skarn (Cox and Singer, 1986, model 14b).

Reporter information

Type Date Name Affiliation Comment
Reporter 10-MAY-98 Travis L. Hudson Applied Geology

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

Maps centered on this site

Authoritative Alaska resources

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