1. Mineral Resources
  2. Online Spatial Data
  3. Mineral Resource Data System (MRDS)

Unnamed (on south side of First Chance Creek valley)

Occurrence in Alaska, United States with commodity Tin
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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. Nearby scientific data
  10. Economic information about the deposit and operations
  11. Mining district
  12. Links to other databases
  13. Bibliographic references
  14. General comments
  15. Reporter information

Geologic information

Identification information

Deposit ID 10308385
Record type Site
Current site name Unnamed (on south side of First Chance Creek valley)

Geographic coordinates

Geographic coordinates: -167.95443, 65.56725 (WGS84)
Relative position This lode tin occurrence is located at about 200 feet elevation on the low divide between First Chance and Sarah Creeks. First Chance Creek is the small west tributary located 0.75 miles upstream from the mouth of Cape Creek (TE006) at Tin City on the Bering Sea coast. This location was not included separately by Cobb and Sainsbury (1972) or Cobb (1975).

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-6(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

Wales 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
Tin Critical Primary

Materials information

Materials Type of material
Cassiterite Ore

Alteration

  • (Local) Oxidation and clay development have been noted in the felsic dike.

Mineral occurrence model information

Model code 47
USGS model code 15b
Deposit model name Sn veins
Model code 47
USGS model code 15b
Deposit model name Sn veins

Nearby scientific data

(1) -167.95443, 65.56725
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = Felsic dikes to 100 feet wide cross cut Mississippian marble (Sainsbury, 1972) on the low divide between First Chance and Sarah Creeks (Mulligan, 1966, p. 22). Detrital cassiterite mapping suggests that the area containing the dikes is a source of at least some of the placer cassiterite recovered from First Chance Creek (Mulligan, 1966, p. 21). A 175 foot-long dozer trench was opened across one of these dikes. Composite samples from this trench all indicate low but anomalous tin concentrations of 0.01 to 0.06 % (Mulligan, 1966, p. 31). The sample descriptions suggest that the dike is altered, primarily near its contacts where oxidation and clay development is noted. Marine transgressions may have influenced the lower pay streak on nearby Cape Creek (Hudson and Reed, 1997, p. 451-452) and possibly First Chance Creek (TE007). This lode occurrence is at an elevation of 200 feet which is above the highest level of marine deposits that are known in Cape Creek. (TE006). However, this occurrence is located on a marine terrace surface that has a shoreline angle elevation of about 500 feet in this area. The degree to which this higher sea level stand may have influenced the distribution of detrital cassiterite in the First Chance and Cape Creek areas is not known.
  • Age = Late Cretaceous; tin metallization in the Cape Mountain area is interpreted to be linked to evolution of the Cape Mountain biotite granite that has been determined to be 78.8 +/- 2.9 my by the K/Ar method (Hudson and Arth, 1983, p. 769).

Economic information about the deposit and operations

Development status Occurrence

Comments on exploration

  • Status = Inactive

Mining district

District name Port Clarence

Comments on the reserve resource information

  • Reserves = Not defined, identified grades are low

Comments on the workings information

  • Workings / Exploration = A 175 foot-long dozer trench crosscuts a 100 foot-wide felsic dike at one location. Detrital cassiterite mapping has been completed in the First Chance Creek drainage (Mulligan, 1966).

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Mulligan, 1966

General comments

Subject category Comment text
Deposit Model Name = Lode tin occurrence (generally related to tin vein model of Cox and Singer, 1986; model 15b)
Deposit Model Number = Not a strong analog to deposit models; possibly tin veins, model 15b

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

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.