Unnamed Prospect

The Unnamed Prospect is a zinc, lead, and silver mine located in La Plata county, Colorado at an elevation of 8,960 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: Unnamed Prospect

Commodity

Primary: Zinc
Primary: Lead
Primary: Silver
Secondary: Copper
Tertiary: Gold

Location

State: Colorado
County: La Plata
District: Cascade 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.
Administrative Organization: San Juan N. F.

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Occurrence
Deposit Type: Vein
Operation Type: Unknown
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

Model Name: Polymetallic veins

Orebody

Not available

Structure

Type: R
Description: San Juan Uplift

Type: L
Description: Needle Mtns Uplift

Alterations

Alteration Type: L
Alteration Text: Fe Oxidation, Silicification

Rocks

Name: Gabbro
Role: Associated
Age Type: Associated Rock Unit
Age in Years: 1454.000000+-
Dating Method: Rb-Sr
Age Young: Precambrian

Name: Gabbro
Role: Associated
Age Type: Associated Rock Unit
Age in Years: 1460.000000+-
Dating Method: U-Pb (zircon)
Material Analyzed: Zircon
Age Young: Precambrian

Name: Monzonite
Role: Associated
Age Type: Associated Rock
Age Young: Neoproterozoic

Analytical Data

Analytical Data: SIX CHIP SAMPLES OF CLAY AND SILICEOUS LIMESTONE FROM BACK AND RIB OF FIRST SECTION OF TUNNEL CONTAINED 0.2 OZ/TON AG, 0.01% PB, 0.01% ZN,0.008 OZ/TON AU. TEN CHIP SAMPLES OF CLAY, LIMONITE-STAINED SILICEOUS LIMESTONE, PYRITE, AND GOUGE ALONG VEIN IN EAST HALF OF TUNNEL CONTAINED0.3 TO 1.3 OZ/TON AG, 0.02% CU, 0.24% PB, 0.01 TO 0.25% ZN. THREE CHIP SAMPLES OF CALCITE, CLAY GOUGE, PYRITE, AND LIMONITE-STAINED SILICEOUS LIMESTONE FROM STOPED AREAS CONTAINED 2 OZ/TON AG, 0.02% CU, 0.39% PB,0.01 TO 0.76% ZN.

Materials

Ore: Galena
Ore: Sphalerite
Ore: Pyrite
Gangue: Limonite
Gangue: Calcite
Gangue: Quartz

Comments

Comment (Deposit): MINE DEVELOPED ON VEIN TRENDING N 77 TO 85 W, 62 TO 67 SW, AND CU TING WNW-DIPPING OURAY AND LEADVILLE LIMESTONES ON WEST FLANK OF NEEDLE MTNS UPLIFT.

Comment (Workings): ONE SHAFT OF UNKNOWN DEPTH; ONE TUNNEL DRIVEN N 75 TO 83 E FOR 175FT, THENCE S 77 TO 85 E FOR 225 FT TO FACE; TWO SMALL STOPES

Comment (Location): (LAND STATUS AND ADMINISTRATIVE AREA LOCATIONS CALCULATED USING GIS OVERLAY ANALYSIS FOR SAN JUAN N. F.). EAST OF U.S. ROUTE 550, ON HILLSIDE 0.3 MILE SE OF COLUMBINE CAMPGROUND AND 0.2 MILE NORTH OF NORTH END OF COLUMBINE LAKE. ; INFO FROM LAND.ST :1974

References

Reference (Deposit): BARKER, FRED, 1969, PRECAMBRIAN GEOLOGY OF THE NEEDLE MOUNTAINS, SOUTHWESTERN COLORADO: USGS PROF. PAPER 644-A.

Reference (Deposit): CROSS, WHITMAN, AND HOLE, A.D., 1910, DESCRIPTION OF THE ENGINEER MOUNTAIN QUADRANGLE: USGS FOLIO 171.

Reference (Deposit): SCOTT, D.C., 1983, MINERAL INVESTIGATION OF THE WEST NEEDLE WILDERNESS STUDY AREA AND THE BLM WEST NEEDLE CONTIGUOUS WILDERNESS STUDY AREA,LA PLATA AND SAN JUAN COUNTIES, COLORADO: USBM MLA 35-83,P.8, 42-44.

Colorado Mining Photos

Check out this collection of Colorado's best historic mining photos: Incredible Photos of Colorado Mining Scenes.