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Dee Stock

Occurrence in Conejos county in Colorado, United States with commodities Copper, Molybdenum, Lead, Zinc
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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. Ore body information
  13. Controls for ore emplacement
  14. Economic information about the deposit and operations
  15. Mining district
  16. Land status
  17. Links to other databases
  18. Bibliographic references
  19. General comments
  20. Reporter information

Geologic information

Identification information

Deposit ID 10014098
MRDS ID D010727
Record type Site
Current site name Dee Stock

Geographic coordinates

Geographic coordinates: -106.49532, 37.30085 (WGS84)
Elevation 3181
Relative position 4 MILES S 31 E FROM PLATORO

Site location context

Political divisions (FIPS codes)

Conejos(county)

Colorado(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Red Mountain(quadrangle 1:24,000 scale)

Antonito(quadrangle 1:100,000 scale)

Durango(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Conejos(hydrologic unit)

Rio Grande Headwaters(hydrologic accounting unit)

Rio Grande Headwaters(hydrologic subregion)

Rio Grande(hydrologic region)

Federal lands

Rio Grande 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 Conejos

Public Land Survey System information

Meridian Township Range Section Fraction State
New Mexico 035N 004E 01 Colorado

Comments on the location information

  • AT EASTERN END OF DIVIDE BETWEEN LAKE FORK AND SADDLE CREEK WEST OF CONEJOS RIVER. ELEV AND LAT-LONG GIVEN ARE FOR HILLTOP IN E2 SEC. 01 (SECTION PROJECTED INTO UNSURVEYED AREA). ; INFO FROM LAND.ST :1975

Commodities

Commodity Importance
Copper Tertiary
Molybdenum Tertiary
Lead Tertiary
Zinc Critical Tertiary

Comments on the commodity information

  • ORE MINERALS BASED ON BIRD'S (1973) TABULATION OF MINERAL ZONES

Materials information

Materials Type of material
Chalcopyrite Ore
Galena Ore
Marcasite Ore
Molybdenite Ore
Pyrite Ore
Sphalerite Ore
Chalcedony Gangue
Quartz Gangue
Sericite Gangue

Alteration

  • (Local) Sericitization Of Plagioclase; Silicification

Analytical data

Result BIRD'S (1973) ANALYSES SHOWED FOLLOWING HIGH METAL VALUES: 120 PPM CU, 45 PPM MO, 150 PPM ZN, 470 PPM PB, 230 PPM AS, 140 PPM SB, 45 PPM SE.

Host and associated rocks

  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Rhyolite
    Rock unit name Intrusive Rocks--Rhyolite Porphyry
    Rock description Intrusive Rocks--Rhyolite Porphyry
    Stratigraphic age (youngest) Oligocene
  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Intermediate Volcanic Rock > Andesite
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Rhyolite
    Rock unit name Conejos Formation--Volcaniclastic Facies;Summitville Andesite
    Rock description Conejos Formation--Volcaniclastic Facies;Summitville Andesite

Nearby scientific data

(1) -106.49532, 37.30085
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description San Juan Volcanic Field
Type of structure Local
Structure description Platoro Caldera, Platoro Fault Zone, Dee Stock

Ore body information

  • General form SUBCIRCULAR
    Width 480.06M

Controls for ore emplacement

  • Intrusion At Intersection Of Caldera Rim Fault And Platoro Fault Zone

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1971
Discoverer W.H. Bird

Mining district

District name Ute (Platoro) District

Land status

Ownership category National Forest

Reference information

Bibliographic references

  • Deposit

    BIRD, W.H., 1972, MINERAL DEPOSITS OF THE SOUTHERN PORTION OF THE PLATORO CALDERA COMPLEX, SOUTHEAST SAN JUAN MOUNTAINS, COLORADO: MTN, GEOLOGIST, V. 9, NO. 4, P. 379-387.

  • Deposit

    BIRD, W.H., 1973, THE DEVELOPMENT OF THE SOUTHERN PORTION OF THE PLATORO CALDERA COMPLEX AND ITS RELATED MINERAL DEPOSITS, SOUTHEAST SAN JUAN MOUNTAINS, COLORADO: COLORADO SCHOOL OF MINES THESIS T-1440.

  • Deposit

    LIPMAN, P.W., 1974, GEOLOGIC MAP OF THE PLATORO CALDERA AREA, SOUTHEASTERN SAN JUAN MOUNTAINS, SOUTHWESTERN COLORADO: USGS MAP I-828.

General comments

Subject category Comment text
Deposit ALONG SE RIM OF PLATORO CALDERA, DEE STOCK INTRUDES SUMMITVILLE ANDESITE MOAT-FILL FLOWS LYING AGAINST PRECALDERA CONEJOS FM VOLCANICLASTICS. BIRD DESCRIBES HIGHLY ALTERED ROCK AS FELSIC PORHYRY, BUT LIPMAN (1974) MAPS IT AS RHYOLITE PORPHYRY, IN PART, THE INTRUSIVE EQUIVALENT OF RHYOLITE UNIT IN GREEN RIDGE VOLCANICS (27.8-27.4 MY) (PART OF OLIGOCENE-MIOCENE POST-SUMMITVILLE-COLLAPSE CALDERA-MARGIN IGNEOUS SEQUENCE. BIRD (1973) BELIEVED THAT DEE STOCK AND POSTULATED STOCK BENEATH BIG LAKE RADIAL FRACTURE SYSTEM ARE CONTROLLED BY NW-TRENDING PLATORO FAULT ZONE AND BROADER CONTROLLING PLATORO LINEAMENT. DEE STOCK EMPLACED AT INTERSECTION OF LINEAMENT AND CALDERA RIM FAULT. STRUCTURAL SETTING AND GEOCHEMICAL DATA SUGGEST DEEP HIGH-TEMP DISSEMINATED SULFIDE MINERALIZATION OF ZONE 5 TYPE (SEE DISTRICT RECORD) MAY EXIST BENEATH LAKE FORK VALLEY.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUN-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

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