Lost River-Ida Bell dike exogreisen

Producer in Alaska, United States with commodities Tin, Tungsten

Geologic information

Identification information

Deposit ID 10308415
Record type Site
Current site name Lost River-Ida Bell dike exogreisen

Geographic coordinates

Geographic coordinates: -167.16641, 65.47627 (WGS84)
Relative position The Lost River Mine area includes the Cassiterite dike exogreisen deposit (TE048), the Lost River Mine skarn deposit (TE049), the Lost River Mine endogreisen deposit (TE050), and the Ida Bell dike exogreisen deposit (TE051). The Ida Bell exogreisen deposit is located on the on the west side of Cassiterite Creek, one mile upstream of its confluence with Lost River (Sainsbury, 1969, plate 1). It is at an elevation of 400 to 500 feet. The Ida Bell is a felsic dike that trends northwest for about 2 miles from Lost River across Cassiterite Creek. It intersects the northwest-trending Cassiterite dike in the prospect area. This location was not identified separately by Cobb and Sainsbury (1972) although several relevant references were summarized by Cobb (1975) under the name 'Lost River'.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Tin Primary
Tungsten Primary

Comments on the commodity information

  • Gangue = sulfide minerals
  • Gangue = white mica

Materials information

Materials Type of material
Cassiterite Ore
Wolframite Ore
Fluorite Gangue
Quartz Gangue
Topaz Gangue
Tourmaline Gangue
Mica Gangue

Alteration

  • (Local) Significant alteration is restricted to the Ida Bell dike and includes greisen (quartz, topaz, sericite, fluorite, tourmaline, and arsenopyrite replacement of granite) and later overprinting kaolinization.

Mineral occurrence model information

Model code 47
USGS model code 15b
Deposit model name Sn veins
Model code 49
USGS model code 15c
Deposit model name Sn greisen

Host and associated rocks

  • Host or associated Associated
    Rock unit name Lost River
    Chronological age 80.2
    Uncertainty 2.9
    Type of media Granite
    Stratigraphic age (youngest) Late Cretaceous

Nearby scientific data

(1) -167.16641, 65.47627

Comments on the geologic information

  • Geologic Description = The Ida Bell prospect is developed within a 2-mile long, northwest-trending felsic dike in Ordovician limestone that is up to 55 feet wide but averages 28.5 feet in width where exposed in dozer trenches. At the surface, this dike intersects the Cassiterite dike at about 500 feet elevation on the low north-south trending divide between Cassiterite Creek and Lost River. The age of the mineralization is assumed to be related to the development of tin systems in the Lost River area and therefore Late Cretaceous, the age of the tin-mineralizing granites there (Hudson and Arth, 1983). Fine-grained, leucocratic granite collected from a Lost River Mine dump has been dated at 80.2 +/- 2.9 my (Hudson and Arth, 1983, p.769). Local greisen development and related veining has been overprinted by late kaolinization in most exposed areas. Greisen contains quartz, topaz, sericite, fluorite, and arsenopyrite. A USBM diamond drill hole that intersects the Ida Bell dike 483 feet below the surface intersection with the Cassiterite dike shows it to be 40 feet wide and to average 0.33% tin including a seven foot section of 1.13% tin (Sainsbury, 1964, p. 52). The available drill holes and trenches outline a 900 x 400 x 28.5 foot volume containing about 840,000 tons that averages 0.26% tin and less than 0.1% WO3. One part of this block, near the intersection with the Cassiterite dike, contains 60,000 tons of 1.06% tin (Sainsbury, 1964, p. 52). The more local greisen development in the Ida Bell dike, at least at the surface, contrasts with the more extensive greisen alteration of the Cassiterite dike to the east of Cassiterite Creek in the Lost River mine. However, this prospect has not been extensively explored.
  • Age = the age of the mineralization is assumed to be related to the development of tin systems in the Lost River area and therefore Late Cretaceous, the age of the tin-mineralizing granites there (Hudson and Arth, 1983). Fine-grained, leucocratic granite collected from a Lost River Mine dump has been dated at 80.2 +/- 2.9 my (Hudson and Arth, 1983, p.769).
  • Age = Chronological age is for Lost River Mine.

Economic information

Economic information about the deposit and operations

Development status Producer
Commodity type Metallic

Comments on exploration

  • Status = Active?

Mining district

District name Port Clarence

Comments on the production information

  • Production Notes = Production from the Lost River Mine has been from the Cassiterite dike exogreisen deposit (TE048).

Comments on the reserve resource information

  • Reserves = the available drill holes and trenches outline a 900 x 400 x 28.5 foot volume containing about 840,000 tons that averages 0.26% tin and less than 0.1% WO3. One part of this block, near the intersection with the Cassiterite dike, contains 60,000 tons of 1.06% tin (Sainsbury, 1964, p. 52).

Comments on the workings information

  • Workings / Exploration = Several surface dozer trenches and four USBM diamond drill holes have been completed on the Ida Bell prospect. A short adit and winze were also developed (Heide, 1946, figure 2).

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Alaska Resource Data File ARDF TE051

Bibliographic references

  • Deposit

    Heide, H.E., 1946, Investigation of the Lost River tin deposit, Seward Peninsula, Alaska: U.S. Bureau of Mines Report of Investigations 3902, 57 p.

  • Deposit

    Sainsbury, C.L., 1964, Geology of the Lost River mine area, Alaska: U.S. Geological Survey Bulletin 1129, 80 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

    Hudson, T.L., and Arth, J. G., 1983, Tin-granites of Seward Peninsula, Alaska: Geological Society of America Bulletin, v. 94, p. 768-790.

  • 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.

Comments on the references

  • Primary Reference = Heide, 1946; Sainsbury, 1964

General comments

Subject category Comment text
Deposit Model Name = Exogreisen. This deposit has characteristics of both the tin vein model (15b) and tin greisen model (15c) of Cox and Singer (1986).
Deposit Model Number = 15b, 15c

Reporter information

Type Date Name Affiliation Comment
Reporter 10-MAY-1998 Travis L. Hudson Applied Geology