Unnamed (on Lost River)

Occurrence in Alaska, United States with commodities Tin, Silver, Lead

Geologic information

Identification information

Deposit ID 10308405
Record type Site
Current site name Unnamed (on Lost River)

Geographic coordinates

Geographic coordinates: -167.1854, 65.44827 (WGS84)
Relative position Lost River is the main south-flowing drainage in the York Mountains of western Seward Peninsula. Its mouth on the Bering Sea is 21 miles west of Brevig Mission. This locality is four miles upstream from the mouth and just below the confluence with Tin Creek , a significant east tributary to Lost River. The occurrence is in alluvial gravels of the active Lost River drainage just west of the outcropping Idaho lode prospect (TE040). It is locality 42 of Cobb and Sainsbury (1972). It was not included separately by Cobb (1975).
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Geographic areas

Country State
United States Alaska


Commodity Importance
Tin Primary
Silver Secondary
Lead Secondary

Materials information

Materials Type of material
Cassiterite Ore
Galena Ore

Mineral occurrence model information

Model code 123
USGS model code 39e
BC deposit profile C01. C02
Deposit model name Alluvial placer Sn

Nearby scientific data

(1) -167.1854, 65.44827

Comments on the geologic information

  • Geologic Description = Bedrock in this drainage and its tributaries are various Ordovician limestone facies locally intruded by felsic and mafic dikes and granite stocks (Sainsbury, 1969). The USBM completed two churn-drill holes in the active drainage of Lost River here (Mulligan, 1959, p.12-15). This locality is just west of the outcropping Idaho lode prospect and downstream of the fluorite-beryllium-sulfide mineralization along the Rapid River fault at the Bessie-Maple (TE038) and Lost River valley lode (TE041) prospects. The two churn-drill holes showed the 5 to 6 feet of gravel on bedrock here to contain 0.29 and 0.35 pounds of tin per cubic yard. The gravels at this locality are 9 and 10 feet thick Bedrock described from the bottom of one of these holes is dolomite with chlorite, fluorite, and a trace of pyrite. The gravel in the holes also contained a trace of silver and one contained 0.04 pounds of lead per cubic yard. Galena was identified in the lead-bearing material but otherwise the mineralogy of the heavy mineral concentrates was not reported. Traces of lead and zinc were found in the bedrock but the the related minerals could not be identified (Mulligan, 1959, p. 15).
  • Age = Quaternary

Economic information

Economic information about the deposit and operations

Development status Occurrence

Comments on exploration

  • Status = Inactive

Mining district

District name Port Clarence

Comments on the production information

  • Production Notes = None

Comments on the reserve resource information

  • Reserves = Not defined; low grades are indicated

Comments on the workings information

  • Workings / Exploration = Two USBM churn-drill holes have been completed here (Mulligan, 1959).

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Alaska Resource Data File ARDF TE039

Bibliographic references

  • Deposit

    Mulligan, J.J., 1959, Sampling stream gravels for tin, near York, Seward Peninsula, Alaska: U.S. Bureau of Mines Report of Investigations 5520, 25 p.

  • 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.

  • 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.

  • 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.

Comments on the references

  • Primary Reference = Mulligan, 1959 (USBM RI 5520).

General comments

Subject category Comment text
Deposit Model Name = Alluvial tin placer (Cox and Singer, 1986; model 39e)

Reporter information

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