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Half Dollar Creek

Past Producer in Alaska, United States with commodities Gold, Tin, Tungsten
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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. Mineral occurrence model information
  8. Nearby scientific data
  9. Economic information about the deposit and operations
  10. Mining district
  11. Links to other databases
  12. Bibliographic references
  13. General comments
  14. Reporter information

Geologic information

Identification information

Deposit ID 10308809
MRDS ID A012235
Record type Site
Current site name Half Dollar Creek
Alternate or previous names Two-Bit Gulch
Related records 10160069, 10001489

Geographic coordinates

Geographic coordinates: -144.79292, 65.42274 (WGS84)
Relative position The location is the approximate center of placered area about 0.5 miles long by 1,000 ft wide on Half Dollar Creek below the mouth of Two-Bit Gulch. Some mining was on Two-Bit.

Site location context

Political divisions (FIPS codes)

Yukon-Koyukuk(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Circle B-2(quadrangle 1:63,360 scale)

Circle SE(quadrangle 1:100,000 scale)

Circle(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Alaska(hydrologic region)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary
Tin Critical Secondary
Tungsten Critical Secondary

Materials information

Materials Type of material
Cassiterite Ore
Gold Ore
Scheelite Ore

Mineral occurrence model information

Model code 119
USGS model code 39a
Deposit model name Placer Au-PGE
Mark3 model number 54

Nearby scientific data

(1) -144.79292, 65.42274
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = The entire length of both Two-bit Creek and Half Dollar Creek is underlain by a Cretaceous pluton described by Wiltse and others (1995) as chloritized porphyritic (hornblende) biotite monzogranite. Primary trace minerals in the granite include zircon, allanite, apatite and ilmenite. Uranium has been detected by fluorimetric tests (Eberlein and others, 1977). Minerals in the heavy-mineral fraction of concentrates from the granite contain allanite, hematite, limonite, pyrrhotite, scheelite, sphene and zircon. Stream placer concentrates contain gold, scheelite and cassiterite. The paystreak is narrow and the gold distribution is spotty (Cobb, 1976, [OFR 76-633]). The unmined gravel on Half Dollar Creek is mostly colluvium derived from side slopes (Yeend, 1991). Prospecting and/or mining occurred in 1909 to 1914, 1935, 1938 to 1942, and probably 1976 to 1980 (Menzie and others, 1983). Several small placers were operated along this drainage in the early 1980's (Yeend, 1991). Production from these operations is unknown.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Circle

Comments on the production information

  • Production Notes = Prospecting and/or mining occurred in 1909 to 1914, 1935, 1938 to 1942, and probably 1976 to 1980 (Menzie and others, 1983). Several small placers were operated along this drainage in the early 1980's (Yeend, 1991). Amount of gold produced from these operations is unknown.

Comments on the workings information

  • Workings / Exploration = Prospecting and/or mining occurred in 1909 to 1914, 1935, 1938 to 1942, and probably 1976 to 1980 (Menzie and others, 1983). Several small placers were operated along this drainage in the early 1980's (Yeend, 1991).

Reference information

Bibliographic references

General comments

Subject category Comment text
Deposit Model Name = Placer gold deposit (Cox and Singer, 1986; model 39a)
Deposit Other Comments = See also Bottom Dollar Creek, ARDF no. CI007.

Reporter information

Type Date Name Affiliation Comment
Reporter 09-SEP-1998 C.J. Freeman, J.R. Guidetti Schaefer, A.S. Clements Avalon Development Corporation

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.