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East Mancos River Placers

Past Producer in Montezuma county in Colorado, United States with commodity Gold
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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. Links to other databases
  15. Bibliographic references
  16. General comments
  17. Reporter information

Geologic information

Identification information

Deposit ID 10014163
MRDS ID D010818
Record type Site
Current site name East Mancos River Placers
Alternate or previous names Rocky, Gold Run, Hidden Treasure, Fall Creek, East Gulch,, And Belle of East Mancos Placers, Marshall Placer, Patented Claims: Rocky Placer, MS 16059, Gold Run Placer, MS 16059, Hidden Treasure Placer, MS 16059, Fall Creek Placer, MS 16059, East Gulch Placer, MS 16059, Belle of East Mancos Placer, MS 16059
Related records 10118683, 10191228, 10288462

Geographic coordinates

Geographic coordinates: -108.13871, 37.38501 (WGS84)
Elevation 2816
Relative position 15.4 MILES N 60 W TO 16 MILES N 63 W FROM DURANGO

Site location context

Political divisions (FIPS codes)

Montezuma(county)

Colorado(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Rampart Hills(quadrangle 1:24,000 scale)

Cortez(quadrangle 1:100,000 scale)

Cortez(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Mancos(hydrologic unit)

Upper San Juan(hydrologic accounting unit)

San Juan(hydrologic subregion)

Upper Colorado(hydrologic region)

Federal lands

San Juan National Forest(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State County
United States Colorado Montezuma

Public Land Survey System information

Meridian Township Range Section Fraction State
New Mexico 036N 012W 11,12,13,14 Colorado

Comments on the location information

  • (LAND STATUS AND ADMINISTRATIVE AREA LOCATIONS CALCULATED USING GIS OVERLAY ANALYSIS FOR SAN JUAN N. F.). ALONG EAST MANCOS RIVER FROM POINT 0.5 MILE ABOVE FALL CREEK CONFLUENCE SW 1.5 MILES TO POINT APPROX 0.4 MILE BELOW EAST GULCH CONFLUENCE. CLAIMS COVER LOWER GOLD RUN AND EAST GULCH TRIBUTARIES. ELEV AND LAT-LONG GIVEN ARE FOR COMMON SECTION CORNER. ; INFO FROM LAND.ST :1974

Commodities

Commodity Importance
Gold Primary

Materials information

Materials Type of material
Gold Ore

Host and associated rocks

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

Nearby scientific data

(1) -108.13871, 37.38501
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description San Juan Uplift, Four Corners Platform
Type of structure Local
Structure description La Plata Dome

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1885

Mining district

District name California (La Plata) District

Land status

Ownership category National Forest
Area name San Juan N. F.

Comments on development

  • EARLY MINING DONE BY PANNING AND SLUICING. OMAHA GROUP PURCHASED MARSHALL PLACER (EXACT LOCATION UNCERTAIN) AND INSTALLED HYDRAULIC PLANT IN 1897. PATENTED CLAIMS SURVEYED IN 1902 BY GOLD RUN PLACER MINING CO. IN 1932-1933 PLACERING BY C.H. STARR AND GEORGE GILMORE AND THEIR SONS LED TO DISCOVERY OF RED ARROW LODE ON HILLSIDE JUST UP GOLD RUN CREEK.

Reference information

Bibliographic references

  • Deposit

    ECKEL, E.B., AND OTHERS, 1949, GEOLOGY AND ORE DEPOSITS OF THE LA PLATA DISTRICT, COLORADO: USGS PROF. PAPER 219, P. 76.

  • Deposit

    PARKER, B.H., JR., 1974, GOLD PLACERS OF COLORADO: COLORADO SCHOOL OF MINES QUART., V. 69 NO. 4, P. 194-197.

  • Deposit

    CROSS, WHITMAN, AND OTHERS, 1899, DESCRIPTION OF THE LA PLATA QUADRANGLE: USGS FOLIO 60.

  • Deposit

    BLM MINERAL SURVEY MS 16059

  • Deposit

    ENGINEERING AND MINING JOURNAL, 1934, HIGHER PRICES OF GOLD AND SILVER ENCOURAGE MUCH NEW MINING IN THE UNITED STATES: ENG. MINING JOUR., V. 135, NO. 3, P. 130-131.

General comments

Subject category Comment text
Deposit PLACER AU DERIVED FROM ERODED PORTIONS OF EXPOSED VEINS IN HEADWATERS OF RIVER AND ITS TRIBUTARIES. PLACERS IN AREA GENERALLY WERE OF LOW GRADE BECAUSE (1) MUCH PRIMARY AU IS TELLURIDE, RELATIVELY LIGHT, EASILY BROKEN DOWN INTO FINE PARTICLES, (2) CHEMICAL WEATHERING PRODUCES "MUSTARD" AU THAT CAN BE CARRIED GREATER DISTANCES, (3) ERRATIC CONCENTRATIONS IN SMALL POCKETS IN WIDE VALLEYS SCOURED BY GLACIATION.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-AUG-1983 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.