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Montezuma Mine

Past Producer in Dolores county in Colorado, United States with commodities Silver, Lead, Copper
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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 10014133
MRDS ID D010778
Record type Site
Current site name Montezuma Mine
Related records 10118572

Geographic coordinates

Geographic coordinates: -108.03343, 37.69779 (WGS84)
Elevation 2728
Relative position 0.43 MILES N 26 W FROM RICO

Site location context

Political divisions (FIPS codes)

Dolores(county)

Colorado(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Rico(quadrangle 1:24,000 scale)

Dove Creek(quadrangle 1:100,000 scale)

Cortez(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper Dolores(hydrologic unit)

Upper Colorado-Dolores(hydrologic accounting unit)

Upper Colorado-Dolores(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 Dolores

Public Land Survey System information

Meridian Township Range Section Fraction State
New Mexico 040N 011W 26 SE Colorado

Comments on the location information

  • (LAND STATUS AND ADMINISTRATIVE AREA LOCATIONS CALCULATED USING GIS OVERLAY ANALYSIS FOR SAN JUAN N. F.). ON WEST SIDE OF DOLORES RIVER AT NORTH END OF RICO (UNSURVEYED SECTION). ELEV AND LAT-LONG GIVEN ARE FROM MCKNIGHT, 1974, PL. 1 (1930 BASE). ; INFO FROM LAND.ST :1975

Commodities

Commodity Importance
Silver Primary
Lead Primary
Copper Secondary

Materials information

Materials Type of material
Chalcopyrite Ore
Pyrite Ore
Chlorite Gangue
Dolomite Gangue
Epidote Gangue
Hornblende Gangue
Pyroxene Gangue
Quartz Gangue

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Granitoid > Monzonite
    Stratigraphic age (youngest) Paleocene
    Stratigraphic age (youngest) Pennsylvanian
  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Latite
    Rock unit name Augite Monzonite;Hornblende Latite Porphyry
    Rock description Augite Monzonite;Hornblende Latite Porphyry
  • Host or associated Host
    Rock type Metamorphic Rock > Metasedimentary Rock > Quartzite
  • Host or associated Host
    Rock type Sedimentary Rock > Carbonate > Limestone
    Rock unit name Larsen Quartzite;Hermosa Formation
    Rock description Larsen Quartzite;Hermosa Formation

Nearby scientific data

(1) -108.03343, 37.69779
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description San Juan Uplift, Paradox Basin
Type of structure Local
Structure description Rico Dome, Smelter Fault

Economic information about the deposit and operations

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

Mining district

District name Pioneer (Rico) District

Land status

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

Comments on the workings information

  • UPPER TUNNEL PROBABLY DRIVEN GENERALLY NW, EXTENT UNKNOWN. LOWER TUNNEL DRIVEN N 55 W FOR ABOUT 150 FT, THENCE N 70 W FOR ABOUT 150 FT.

Reference information

Bibliographic references

  • Deposit

    MCKNIGHT, E.T., 1974, GEOLOGY AND ORE DEPOSITS OF THE RICO DISTRICT, COLORADO: USGS PROF. PAPER 723.

  • Deposit

    PRATT, W.P., AND OTHERS, 1969, GEOLOGIC MAP OF THE RICO QUADRANGLE, DOLORES AND MONTEZUMA COUNTIES, COLORADO: USGS MAP GQ-797.

  • Deposit

    RANSOME, F.L., 1901, THE ORE DEPOSITS OF THE RICO MOUNTAINS, COLORADO: USGS 22D ANN. REPT., PT. 2, P. 363-364.

General comments

Subject category Comment text
Deposit JUST NORTH OF CREST OF RICO DOME AND VERY NEAR EAST END OF MONZONITE STOCK, NW-CURVING WEST END OF SMELTER FAULT HAS UPTHROWN PRECAMBRIAN GREENSTONE AND METADIORITE ON NE AGAINST LARSEN QUARTZITE (PENNSYLVANIAN) AND LOWER HERMOSA FM ON SW. MONTEZUMA TUNNEL DRIVEN IN LARSEN QUARTZITE AND PROBABLY CORRESPONDS TO WHAT RANSOME (1901) BELIEVED WAS DEVONIAN QUARTZITE; TUNNEL ALSO CUTS SHEET OF MONZONITE FROM STOCK TO SW. RANSOME NOTED NW-TRENDING VEIN DIPPING ABOUT 70 SW FROM WHICH EXTENDED IRREGULAR BLANKET REPLACEMENT ORE IN CRUSHED LIMESTONE ZONE AT CONTACT BETWEEN QUARTZITE AND HERMOSA FM; RANSOME INTERPRETED THIS AS BEDDING FAULT PARTLY REPLACED BY ORE CONSISTING OF PYRITE, CHALCOPYRITE, AND GALENA IN GANGUE OF QUARTZ AND CHLORITE. UNDERLYING QUARTZITE AND PORPHYRY ARE IMPREGNATED WITH PYRITE. QUARTZITE SHOWS METAMORPHISM CHARACTERIZED BY HORNBLENDE, PYROXENE, EPIDOTE, AND IN OTHER PLACES BY COARSE PYRITE, QUARTZ, CHLORITE, AND DOLOMITE. UPPER TUNNEL FOLLOWS SMALL VEIN AND FLAT, 1- TO
Deposit 2-FT-THICK PYRITE BODY IN CHLORITE MATRIX.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-SEP-1983 Schwochow, Stephen D. Colorado Geological Survey

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

External references

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.