| Deposit ID | 10013445 |
|---|---|
| MRDS ID | D009738 |
| Record type | Site |
| Current site name | Joker Pit |
| Geographic coordinates: | -107.72761, 40.75663 (WGS84) |
|---|---|
| Elevation | 2128 |
| Relative position | 17.5 MILES N 27 E FROM LAY |
Political divisions (FIPS codes)
Moffat(county)
Colorado(state)
United States(country)
North America(continent)
Land(continent)
USGS map quadrangles
East Timberlake Creek(quadrangle 1:24,000 scale)
Craig(quadrangle 1:100,000 scale)
Craig(quadrangle 1:250,000 scale)
Hydrologic units (watersheds)
Little Snake(hydrologic unit)
White-Yampa(hydrologic accounting unit)
White-Yampa(hydrologic subregion)
Upper Colorado(hydrologic region)
Federal lands
Bureau of Land Management(Bureau of Land Management CO)
Bureau of Land Management CO BLM(Type of land area)
BLM(Federal land areas administered by BLM)
| Country | State | County |
|---|---|---|
| United States | Colorado | Moffat |
| Meridian | Township | Range | Section | Fraction | State |
|---|---|---|---|---|---|
| 6th Principal | 009N | 092W | 09 | E2 0F NW | Colorado |
| Commodity | Importance |
|---|---|
| Gold | Primary |
| Thorium | Primary |
| Titanium, Metal Critical | Primary |
| Niobium (Columbium) Critical | Primary |
| Iron | Primary |
| REE Critical | Primary |
| Materials | Type of material |
|---|---|
| Columbite | Ore |
| Euxenite | Ore |
| Gold | Ore |
| Ilmenite | Ore |
| Magnetite | Ore |
| Monazite | Ore |
| Rutile | Ore |
| Garnet | Gangue |
| Quartz | Gangue |
| Zircon | Gangue |
| Result | ANALYSIS BY WARREN R. WAGNER (AS REPORTED IN PARKER, 1974) GAVE $3.37/YD AU, 11.5 LB/YD COMBINED ILMENITE, EUXENITE, COLUMBITE AND RUTILE, 6.8 LB/YD MONAZITE, 3.6 LB/YD GARNET, 3.4 LB/YD MAGNETITE, 3.4 LB/YD "NON-MAGNETICS" (PRINCIPALLY ZIRCON AND QUARTZ, WITH MINOR FELDSPAR, GARNET, ILMENITE, AND MAGNETITE). TOTAL HM=28.7 LB/YD. MONAZITE REPORTEDLYCONTAINED 9.62% TH02. MORE RECENT TESTS BY MARATHON INDICATED O.044 TO 0.06 OZ/TON AND 0.10 TO 0.104 OZ/TON AU, WITH 28 TO 35 LB/TON BLACK SAND CONCENTRATE. |
|---|
| Host or associated | Host | ||
|---|---|---|---|
| Rock type | Sedimentary Rock > Clastic Sedimentary Rock > Conglomerate | ||
| Rock unit name | Unconsolidated Deposits--Alluvium;Cathedral Bluffs Member Of Wasatch Formation | ||
| Rock description | Unconsolidated Deposits--Alluvium;Cathedral Bluffs Mbr Of Wasatch Formation | ||
| |||
| (1) | -107.72761, 40.75663 |
|---|
| Type of structure | Regional |
|---|---|
| Structure description | Washakie Basin |
| Type of structure | Local |
| Structure description | Washakie Basin |
| Development status | Producer |
|---|---|
| Commodity type | Metallic |
| Deposit size | Small |
| Significant | No |
| District name | Fourmile (Timberlake Creek) District |
|---|
| Ownership category | BLM Administrative Area |
|---|
| Type | Operator |
|---|---|
| Owner | Marathon Gold Corp. |
| Home office | Craig |
| First year | 1984 |
| Type | Owner |
|---|---|
| Owner | Marathon Gold Corp. And Centennial Gold Corp. |
| Home office | Craig |
| First year | 1984 |
| Agency | Database name | Acronym | Record ID | Notes |
|---|---|---|---|---|
| USGS | Mineral Resources Data System | MRDS | D009738 |
PARKER, B.H., JR., 1974, THE PLACERS OF MOFFAT COUNTY, IN GOLD PLACERS OF COLORADO: COLORADO SCHOOL OF MINES QUART., V. 69, NO. 4, P. 150-168.
TWETO, OGDEN, 1976, GEOLOGIC MAP OF THE CRAIG 1X2 QUADRANGLE, NORTHWESTERN COLORADO: USGS MAP I-972
SNOW, E.P., 1895, THE FOURMILE PLACER FIELDS OF (MOFFAT COUNTY), COLORADO AND WYOMING: ENG. MINING JOUR., V. 60, P. 102-105
HOOVER, HERBERT C., 1897, GEOLOGY OF THE FOUR-MILE PLACER MINING DISTRICT (MOFFAT COUNTY), COLORADO: ENG. MINING JOUR., V. 63, P. 510.
5) MINING RECORD (VARIOUS ARTICLES): 2/16/83, 4/6/83, 4/13/83, 6/8/83, 6/29/83, 9/28/83, 11/30/83.
6) DENVER POST 6/29/84.
| Subject category | Comment text |
|---|---|
| Deposit | DRIFTS MADE AT MINE WERE IN CHANNEL CONGLOMERATE IN BEDROCK (CATHEDRAL BLUFFS MEMBER). SURFACE CUTS MADE IN QUATERNARY TERRACE ALLUVIUM ABOUT 50 FT ABOUT LEVEL OF HOUSEL GULCH. FARNSWORTH'S ORIGINAL DESCRIPTION STATED THAT THE HIGHER PAYING ZONES IN AREA LIE IN SLIGHTLY CONSOLIDATED GRAVELS BENEATH IRON OXIDE-CEMENTED CONGLOMERATE AND ABOVE LAYER OF "BLUE CLAY," (NOW INTERPRETED AS EOCENE BEDROCK). AU CONCENTRATIONS IN TERRACE AND MANTLE DEPOSITS APPEAR LIMITED TO LEVEL BELOW THE PROMINENT CONGLOMERATE OR "CAP ROCK," WHICH WAS INTERPRETED BY PARKER (1974) AND THEOBALD AS A DELTAIC FAN IN EITHER THE TIPTON TONGUE OF GREEN RIVER FM (EOCENE) OR CATHEDRAL BLUFFS MBR OF WASATCH FM (EOCENE). MODERN PLACERS THUS WERE DERIVED FROM EOCENE FOSSIL BEACH AND ALLUVIAL PLACERS AND PROBABLY BEGAN FORMING IN LATE PLIOCENE OR PLEISTOCENE TIME. AGE OF MINERALIZATION CITED FOR DEPOSIT DEPENDS ON UNIT WORKED--EOCENE FOR BEDROCK OPERATIONS OR QUATERNARY FOR TERRACE, STREAM BED, AND MANTLE OPERATIONS. |
| Type | Date | Name | Affiliation | Comment |
|---|---|---|---|---|
| Reporter | 01-DEC-1982 | Schwochow, Stephen D. | Colorado Geological Survey | |
| Updater | 01-JUL-1992 | Spanski, Gregory T. | U.S. Geological Survey |
Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.
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