Dee Stock

The Dee Stock is a mine located in Conejos county, Colorado at an elevation of 10,436 feet.

About the MRDS Data:

All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.

Mine Info

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Site Name

Primary: Dee Stock

Commodity

Tertiary: Copper
Tertiary: Molybdenum
Tertiary: Lead
Tertiary: Zinc

Location

State: Colorado
County: Conejos
District: Ute (Platoro) District

Land Status

Land ownership: National Forest
Note: the land ownership field only identifies whether the area the mine is in is generally on public lands like Forest Service or BLM land, or if it is in an area that is generally private property. It does not definitively identify property status, nor does it indicate claim status or whether an area is open to prospecting. Always respect private property.

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Occurrence
Operation Type: Unknown
Discovery Year: 1971
Discovery Method: Ore-Mineral In Place
Years of Production:
Organization:
Significant: N
Deposit Size: S

Physiography

General Physiographic Area: Rocky Mountain System
Physiographic Province: Southern Rocky Mountains

Mineral Deposit Model

Not available

Orebody

Form: SUBCIRCULAR

Structure

Type: R
Description: San Juan Volcanic Field

Type: L
Description: Platoro Caldera, Platoro Fault Zone, Dee Stock

Alterations

Alteration Type: L
Alteration Text: Sericitization Of Plagioclase; Silicification

Rocks

Name: Rhyolite
Role: Associated
Age Type: Associated Rock
Age Young: Oligocene

Analytical Data

Analytical Data: 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.

Materials

Ore: Molybdenite
Ore: Chalcopyrite
Ore: Marcasite
Ore: Sphalerite
Ore: Pyrite
Ore: Galena
Gangue: Sericite
Gangue: Quartz
Gangue: Chalcedony

Comments

Comment (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.

Comment (Location): 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

Comment (Commodity): ORE MINERALS BASED ON BIRD'S (1973) TABULATION OF MINERAL ZONES

References

Reference (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.

Reference (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.

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

Colorado Mining Photos

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