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  3. Mineral Resource Data System (MRDS)

Unnamed Gold Occurrence

Occurrence in Douglas county in Colorado, United States with commodities Gold, Silver
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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. Alteration
  9. Host and associated rocks
  10. Nearby scientific data
  11. Geologic structures
  12. Economic information about the deposit and operations
  13. Mining district
  14. Land status
  15. Links to other databases
  16. Bibliographic references
  17. Reporter information

Geologic information

Identification information

Deposit ID 10012327
MRDS ID D007889
Record type Site
Current site name Unnamed Gold Occurrence

Geographic coordinates

Geographic coordinates: -104.74889, 39.37194 (WGS84)
Elevation 1875
Relative position 5.8 MILES DUE EAST OF CASTLE ROCK

Site location context

Political divisions (FIPS codes)

Douglas(county)

Colorado(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Russellville Gulch(quadrangle 1:24,000 scale)

Castle Rock(quadrangle 1:100,000 scale)

Denver(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Middle South Platte-Cherry Creek(hydrologic unit)

South Platte(hydrologic accounting unit)

South Platte(hydrologic subregion)

Missouri(hydrologic region)

Geographic areas

Country State County
United States Colorado Douglas

Public Land Survey System information

Meridian Township Range Section Fraction State
6th Principal 008S 066W 11 NE OF SE OF NW Colorado

Comments on the location information

  • ON RUSSELLVILLE GULCH AT COLO. 83 1.3 MILES SSE OF FRANKTOWN ; INFO FROM LAND.ST :(1974)

Commodities

Commodity Importance
Gold Tertiary
Silver Tertiary

Materials information

Materials Type of material
Gold Ore
Silver Ore

Alteration

  • (Local) Denver Basin

Analytical data

Result AU-AG ANALYSIS FROM DESBOROUGH AND OTHERS (1970, LOCALITY 6)
Result EACH SET OF VALUES IS AU GRAIN SIZE (MM), WT % AG IN GRAIN CENTER, RANGE OF WT % AG IN GRAIN RIM: 0.107, LT 0.1, LT 0.1
Result 0.262, LT 0.1, 0 TO 0.3. SECOND SET OF VALUES REPRESENT SILVER-RICH AMALGAMATED GRAINS HEATED TO 600 C TO REMOVE AMALGAMATED HG. AG VALUES REPRESENT ONE ANALYSIS AT GRAIN CENTER AND RANGE OF FOUR VALUES ON GRAIN RIM: 0.112, 1.9, 0 TO 0.4
Result 0.212, 0.8, 0.2 TO 9.2
Result 0.237, 1.5, 0 TO 0.7
Result 0.237, 1.3, 0 TO 22.4
Result 0.150, 0.0

Host and associated rocks

  • Host or associated Host
    Rock type Unconsolidated Deposit > Gravel
    Stratigraphic age (youngest) Holocene
  • Host or associated Host
    Rock type Unconsolidated Deposit > Sand and Gravel
    Rock unit name Piney Creek Alluvium;Post-Piney Creek Alluvium
    Rock description Piney Creek Alluvium;Post-Piney Creek Alluvium

Nearby scientific data

(1) -104.74889, 39.37194
ListMap

Economic information

Geologic structures

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

Comments on the geologic information

  • PROBABLE SOURCE OF GOLD IS CASTLE ROCK CONGLOMERATE (LOWER OLIGOCENE)

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic
Deposit size Small
Significant No

Mining district

District name Castle Rock Area

Land status

Ownership category Private

Reference information

Bibliographic references

  • Deposit

    DESBOROUGH, G.A., AND OTHERS, 1970, PLACER GOLD OF UNIQUE FINENESS IN DOUGLAS AND ELBERT COUNTIES, COLORADO: USGS PROF. PAPER 700-D, P. D134-D139.

  • Deposit

    TRIMBLE, D.E., AND MACHETTE, M.N., 1979, GEOLOGIC MAP OF THE COLORADO SPRINGS-CASTLE ROCK AREA, FRONT RANGE URBAN CORRIDOR, COLORADO: USGS MAP 1-857-F.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-SEP-1981 Schwochow, Stephen D. Colorado 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.