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Joker Pit

Producer in Moffat county in Colorado, United States with commodities Gold, Thorium, Titanium, Metal, Niobium (Columbium), Iron, REE
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Public Land Survey System information
  6. Commodities
  7. Materials information
  8. Host and associated rocks
  9. Nearby scientific data
  10. Geologic structures
  11. Economic information about the deposit and operations
  12. Mining district
  13. Land status
  14. Ownership information
  15. Links to other databases
  16. Bibliographic references
  17. General comments
  18. Reporter information

Geologic information

Identification information

Deposit ID 10013445
MRDS ID D009738
Record type Site
Current site name Joker Pit

Geographic coordinates

Geographic coordinates: -107.72761, 40.75663 (WGS84)
Elevation 2128
Relative position 17.5 MILES N 27 E FROM LAY

Site location context

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)

Geographic areas

Country State County
United States Colorado Moffat

Public Land Survey System information

Meridian Township Range Section Fraction State
6th Principal 009N 092W 09 E2 0F NW Colorado

Comments on the location information

  • ON UPPER HOUSEL GULCH ; INFO FROM LAND.ST :(1974)

Commodities

Commodity Importance
Gold Primary
Thorium Primary
Titanium, Metal Critical Primary
Niobium (Columbium) Critical Primary
Iron Primary
REE Critical Primary

Materials information

Materials Type of material
Columbite Ore
Euxenite Ore
Gold Ore
Ilmenite Ore
Magnetite Ore
Monazite Ore
Rutile Ore
Garnet Gangue
Quartz Gangue
Zircon Gangue

Analytical data

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 and associated rocks

  • 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
    Stratigraphic age (youngest) Eocene

Nearby scientific data

(1) -107.72761, 40.75663
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description Washakie Basin
Type of structure Local
Structure description Washakie Basin

Economic information about the deposit and operations

Development status Producer
Commodity type Metallic
Deposit size Small
Significant No

Mining district

District name Fourmile (Timberlake Creek) District

Land status

Ownership category BLM Administrative Area

Ownership information

  • 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

Comments on the workings information

  • SURFACE CUTS IN TERRACE GRAVEL, DRIFTS IN BEDROCK . NEW AU AND MINERAL RECOVERY PLANT AT MINE.

Comments on development

  • MILL.CAP: 4000 ST/DAY ; ECON.YEAR: 1983

Reference information

Bibliographic references

  • Deposit

    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.

  • Deposit

    TWETO, OGDEN, 1976, GEOLOGIC MAP OF THE CRAIG 1X2 QUADRANGLE, NORTHWESTERN COLORADO: USGS MAP I-972

  • Deposit

    SNOW, E.P., 1895, THE FOURMILE PLACER FIELDS OF (MOFFAT COUNTY), COLORADO AND WYOMING: ENG. MINING JOUR., V. 60, P. 102-105

  • Deposit

    HOOVER, HERBERT C., 1897, GEOLOGY OF THE FOUR-MILE PLACER MINING DISTRICT (MOFFAT COUNTY), COLORADO: ENG. MINING JOUR., V. 63, P. 510.

  • Deposit

    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.

  • Deposit

    6) DENVER POST 6/29/84.

General comments

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.

Reporter information

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

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

Maps centered on this site

Authoritative Colorado resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.