| Deposit ID | 10001489 |
|---|---|
| MRDS ID | A012235 |
| Record type | Site |
| Current site name | Half Dollar Creek |
| Alternate or previous names | Two-Bit Gulch |
| Related records | 10160069 |
| Geographic coordinates: | -144.79263, 65.42252 (WGS84) |
|---|---|
| Relative position | SEE LOCATION COMMENTS |
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)
| Country | State |
|---|---|
| United States | Alaska |
| Materials | Type of material |
|---|---|
| Gold | Ore |
| Cassiterite | Unknown |
| Scheelite | Unknown |
| Host or associated | Host |
|---|---|
| Rock type | Unconsolidated Deposit > Gravel |
| (1) | -144.79263, 65.42252 |
|---|
| Development status | Producer |
|---|---|
| Commodity type | Metallic |
| Deposit size | Small |
| Significant | No |
| Discovery year | 1909 |
| District name | Circle |
|---|
| Agency | Database name | Acronym | Record ID | Notes |
|---|---|---|---|---|
| USGS | Mineral Resources Data System | MRDS | A012235 | |
| USGS | Alaska Resource Data File | ARDF | CI024 | |
| USGS | Mineral Resources Data System | MRDS | D002683 |
Ellsworth, C. E. and Parker, G. L., 1911, Placer mining in the Yukon-Tanana region: U.S. Geological Survey Bulletin 480, p. 153-172.
Ellsworth, C. E., 1912, Placer mining in the Fairbanks and Circle Disctricts: U.S. Geological Survey Bulletin 520, p. 240-245.
Ellsworth, C. E. and Davenport, R. W., 1913, Placer mining in the Yukon-Tanana Region: U.S. Geological Survey Bulletin 542, p. 203-222.
Brooks, A. H., 1914, The Alaskan mining industry in 1913: U.S. Geological Survey Bulletin 592-A, p. 45-74.
Chapin, T., 1914, Placer mining in the Yukon-Tanana region: U.S. Geological Survey Bulletin 592-J, p. 357-362.
Brooks, A. H., 1915, The Alaskan mining industry in 1914: U.S. Geological Survey Bulletin 622, p. 15-68.
Smith, P. S., 1937, Mineral industry of Alaska in 1935: U.S. Geological Survey Bulletin 880-A, p. 1-88.
Smith, P. S., 1939, Mineral industry of Alaska in 1938: U.S. Geological Survey Bulletin 917-A, p. 1-106.
Cobb, E. H., 1972, Metallic mineral resources map of the Circle quadrangle, Alaska: U.S. Geological Survey Misc. Field Studies Map 391, 1 sheet, scale 1:250,000.
Cobb, E. H., 1973, Placer deposits of Alaska: U.S. Geological Survey Bulletin 1374, 213 p.
Cobb, E. H., 1976, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Circle quadrangle, Alaska: U. S. Geological Survey Open-File Report 76-633, 72 p.
Barker, J. C., 1979, Trace element study of the Circle mining district, Alaska: U.S. Bureau of Mines Open File Report 57-79, 74 p.
Menzie, W. D., Foster, H. L., Tripp, R.B., and Yeend, W. E., 1983, Mineral resource assessment of the Circle quadrangle, Alaska: U.S. Geological Survey Open-File Report 83-170-B, 61 p., 1 sheet, 1:250,000.
Bundtzen, T. K., Eakins, G. R., Green, C. B., and Lueck, L. L., 1986, Alaska's mineral industry 1985: Alaska Division of Geological and Geophysical Surveys Special Report 39, 68 p.
Yeend, W. E., 1991, Gold placers of the Circle district, Alaska - past, present, and future: U.S. Geological Survey Bulletin 1943, 42 p.
BAG-OFR-83-170B-55
Smith, P.S., 1942, Mineral industry of Alaska in 1940: U.S. Geological Survey Bulletin 933-A, p. 1-102.
Smith, P.S., 1941, Mineral industry of Alaska in 1939: U.S. Geological Survey Bulletin 926-A, p. 1-106.
| Subject category | Comment text |
|---|---|
| Deposit | Discovery Year: 1909-10 |
| Deposit | 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). |
| Deposit | PRODUCTION FROM THESE OPERATIONS IS UNKNOWN. |
| Deposit | SEE ALSO BOTTOM DOLLAR CREEK, ARDF NO. CI007; USGS OFR 83-170-B, APPENDIX I, NO. 55, 109 |
| Type | Date | Name | Affiliation | Comment |
|---|---|---|---|---|
| Reporter | 01-JUN-1986 | Leonard, Kenneth R. (Elliott, R. L.) | U.S. Geological Survey | |
| Updater | 01-SEP-1998 | C.J. Freeman, J.R. Guidetti Schaefer, A.S. Clements | Avalon Development Corporation |
Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.
These are landing pages for further research — the state agencies don't currently expose per-mine deep links.