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Mammoth-Revenue Mine

Producer in Conejos county in Colorado, United States with commodities Gold, Silver, Copper, Lead, Zinc, Antimony, Molybdenum
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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. Mineral occurrence model information
  10. Host and associated rocks
  11. Nearby scientific data
  12. Geologic structures
  13. Controls for ore emplacement
  14. Economic information about the deposit and operations
  15. Mining district
  16. Land status
  17. Ownership information
  18. Links to other databases
  19. Bibliographic references
  20. General comments
  21. Reporter information

Geologic information

Identification information

Deposit ID 10014101
MRDS ID D010731
Record type Site
Current site name Mammoth-Revenue Mine
Alternate or previous names Mammoth Mine, Mammoth Group, Patented Claims: Mammoth, MS 5628a, Mammoth Mill Site, MS 5628b, Middle, MS 5636, Revenue, MS 5722, Burris, MS 6255, Hyman, MS 6255, Hallam, MS 6255, Grover Cleveland, MS 6256, Aztec, MS 6256, Morning Star, MS 6256, Arms, MS 6256, Auraria, MS 6535, Etruria, MS 6535, Pavonia, MS 6535, Servia, MS 6535, Umbria, MS 6535
Related records 10190709, 10239383

Geographic coordinates

Geographic coordinates: -106.53504, 37.34669 (WGS84)
Elevation 3024
Relative position 1700 FT S 16 W FROM PLATORO

Site location context

Political divisions (FIPS codes)

Conejos(county)

Colorado(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Platoro(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 036N 004E 22,23 E2 (22); W2 OF SW (23) Colorado

Comments on the location information

  • CLAIMS LIE ALONG NE BASE OF FOREST KING MTN SOUTH OF CONEJOS RIVER ON SW SIDE OF TOWN. ELEV AND LAT-LONG GIVEN ARE FOR TUNNEL PORTAL IN NW SW NE SEC. 22 (SECTIONS PROJECTED INTO UNSURVEYED AREA). ; INFO FROM LAND.ST :1975

Commodities

Commodity Importance
Gold Primary
Silver Primary
Copper Secondary
Lead Secondary
Zinc Critical Tertiary
Antimony Critical Tertiary
Molybdenum Tertiary

Comments on the commodity information

  • ARSENOPYRITE REPORTED BY PATTON (1917) CITED FOR ENTIRE DISTRICT. PETZITE (TELLURIDE) REPORTED BY PATTON IN GILMORE AND PLATORO DISTRICTS WAS PROBABLY MISIDENTIFIED SULFIDE (BIRD, 1973). MINOR PRODUCTION OF CU AND PB UNCERTAIN DUE TO LACK OF OLDER PRODUCTION RECORDS.

Materials information

Materials Type of material
Chalcocite Ore
Covellite Ore
Digenite Ore
Electrum Ore
Galena Ore
Gold Ore
Marcasite Ore
Miargyrite Ore
Molybdenite Ore
Polybasite Ore
Proustite Ore
Pyrargyrite Ore
Pyrrhotite Ore
Silver Ore
Sphalerite Ore
Zinkenite Ore
Anhydrite Gangue
Barite Gangue
Calcite Gangue
Chalcedony Gangue
Quartz Gangue

Alteration

  • (Local) All Wallrock Is Silicified To Some Extent Within Vein And Up To 6.5 Ft Into Footwall And Up To 16.5 Ft Into Hanging Wall. In Hanging Wall Zones, All Material Within 1.6 Ft Of Vein Is Completely Silicified. Sericite Progressivly Prominent At 1.6 To 6.5 Ft And Dominant From 6.5 To 26 Ft. At 13 Ft, Kaolinite Prominent. At 26 Ft, Rock Shows Regional Argillization.

Analytical data

Result REPRESENTATIVE ORE ASSAYS (PATTON, 1917): MASSIVE ARSENOPYRITE FROM FOOTWALL, 0.4 OZ/TON AU, 1.4 OZ/TON AG
Result LOW-GRADE ORE, 0.4 OZ/TON AU, 1.6 OZ/TON AG
Result MEDIUM-GRADE ORE, 0.88 OZ/TON AU, 8.5 OZ/TON AG
Result HIGH-GRADE ORE, 1.30 OZ/TON AU, 125.50 OZ/TON AG. THREE ORE SHIPMENTS FROM 1889 CONTAINED 15.85 TO 22.36 OZ/TON AU AND 239.70 TO 306.00 OZ/TON AG. TWO ORE SHIPMENTS FROM 1890 CONTAINED 9.73 AND 30.42 OZ/TON AU AND 250.70 AND 402.10 OZ/TON AG.

Mineral occurrence model information

Model code 154
USGS model code 25e
Deposit model name Epithermal quartz-alunite Au
Mark3 model number 38

Host and associated rocks

  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Quartz Latite
    Rock unit name La Jara Canyon Member Of Treasure Mountain Tuff
    Rock description La Jara Canyon Member Of Treasure Mountain Tuff
    Stratigraphic age (youngest) Oligocene
    Chronological age 29.8
    Dating method K-Ar
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Quartz Latite
    Rock unit name La Jara Canyon Member Of Treasure Mountain Tuff
    Rock description La Jara Canyon Member Of Treasure Mountain Tuff
    Stratigraphic age (youngest) Oligocene
    Chronological age 29.8
    Dating method K-Ar

Nearby scientific data

(1) -106.53504, 37.34669
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description San Juan Volcanic Field
Type of structure Local
Structure description Platoro Caldera, Summitville Caldera, Platoro Fault Zone, Cornwall Block

Controls for ore emplacement

  • Wider, Steeper Portions Of Fault Zone Next To Cornwall Resurgent Block

Economic information about the deposit and operations

Development status Producer
Commodity type Metallic
Deposit size Small
Significant No

Mining district

District name Ute (Platoro) District

Land status

Ownership category Private

Ownership information

  • Type Owner-Operator
    Owner Union Mines
    Home office Lakewood
    First year 1983

Comments on the production information

  • PARTIAL PRODUCTION RECORD. ANNUAL PRODUCTION AND CUMULATIVE PRODUCTION FOR 1889-1906 NOT AVAILABLE. PRODUCTION IS CITED FOR 1966 IN USBM MINERALS YEARBOOK, BUT FIGURES ARE WITHHELD. AU AND AG VALUES FOR 1969 ARE CALCULATED FROM REPORTED ORE TONNAGE AND MEDIAN OF CALCULATED ORE GRADES USING 1968 AND 1970 FIGURES. OTHER ESTIMATED AU AND AG VALUES HAVE BEEN ROUNDED TO NEAREST OZ FROM REPORTED FRACTIONAL VALUES. CUMULATIVE AU AND AG VALUES HAVE BEEN ROUNDED AFTER TOTALLING OF FRACTIONAL REPORTED VALUES. FIGURES FOR 1974 INCLUDE BOTH MINED ORE AND MILLED ORE FROM STOCKPILE AT MILL.

Comments on the workings information

  • MINE DEVELOPED BY MAIN TUNNEL DRIVEN 1600 FT AT S 30 E INTO VEIN, WITH 1200-FT DRIFT ON -100 LEVEL AND 400-FT DRIFT ON -200 LEVEL. BRANCH WORKINGS ON PAROLE VEIN AND SW BRANCH VEIN. RAISE OR WINZE CONNECTS SECOND TUNNEL 253 FT ABOVE MAIN TUNNEL LEVEL. REVENUE TUNNEL IS 332 FT ABOVE TUNNEL LEVEL. DEVELOPMENTS BY CORONADO SILVER IN 1970-72 INCLUDE ADDITIONAL DRIFTS, RAISES, STOPING, AND NEW 450-FT ADIT EAST OF OLD PORTAL.

Reference information

Bibliographic references

  • Deposit

    PATTON, H.B., 1917, GEOLOGY AND ORE DEPOSITS OF THE PLATORO-SUMMITVILLE MINING DISTRICT, COLORADO: CGS BULL. 13.

  • Deposit

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

  • 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

    COLORADO DIV. MINES INF. REPTS. AND ANNUAL OPERATOR REPTS.

  • Deposit

    BLM MINERAL SURVEYS MS 5628A&B, 5722A&B, 5636A&B, 6255, 6256, 6535

  • Deposit

    BIRD, W.H., 1973, 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.

  • Production

    COLORADO DIV. MINES ANN. OPERATOR REPTS.; USBM MINERALS YEARBOOKS 1966-1974

General comments

Subject category Comment text
Deposit MAMMOTH-REVENUE IS SOUTHERNMOST OF THREE MINES DEVELOPED ON SOUTH MOUNTAIN-PLATORO FAULT, LARGEST OF SEVERAL QUARTZ-PYRITE VEIN ZONES IN PLATORO FAULT ZONE. FAULT HAS BEEN INTERPRETED AS EXTENDING NW EITHER ON TREND WITH OR JOINING SOUTH MOUNTAIN FAULT OF SUMMIT AND DECATUR WEST DISTRICTS, AND SE INTO BIG LAKE RADIAL FRACTURE SYSTEM. FAULT TRENDS GENERALLY N 30 W WITH 80 TO 90 SW DIP. DUE TO MOVEMENT ON CORNWALL RESURGENT BLOCK IN FOOTWALL, STEEPER PORTIONS OF FAULT CONTAIN WIDER MINERALIZED ZONE THAN LESS STEEPLY DIPPING PORTIONS. DISPLACEMENT DECREASES SE FROM STUNNER PASS TO FOREST KING MTN-MAMMOTH MTN SADDLE. NORTH PART OF VEIN ZONE EXCEEDS 150 FT IN THICKNESS BUT DECREASES TO 50 FT SOUTH OF INTERSECTION WITH ENE-TRENDING EMMA CROSS-FAULT. IN MAMMOTH-REVENUE MINE, VEIN IS ACTUALLY VEIN ZONE CONSISTING OF NETWORK OF INTERWOVEN VEINS GENERALLY PARALLELING MAJOR FAULT BUT WITH CONSIDERABLE VARIATIONS, FROM N 0 TO 25 W IN STRIKE AND 85 NE TO 70 SW IN DIP. LESSER VEINS DIP VARIABLY
Deposit FROM 75 NE TO 55 SW. APPARENTLY SOME CYMOID LOOP DEVELOPMENT WITH SPLITTING AND JOINING OF SUBSIDIARY VEINS. MAMMOTH-REVENUE VEIN AND VALLEY QUEEN VEIN (APPARENTLY) FOUND IN FOOTWALL; PAROLE VEIN FOUND IN HANGING WALL. VEIN ZONE COMPOSED OF THREE TYPES OF MATERIAL. FIRST TYPE IS QUARTZ AND SULFIDE ORE IN CENTER OF STRUCTURE. WIDE AREAS ARE HIGHLY BRECCIATED, OFTEN VUGGY WITH WATER-COURSE RESIDUES OF MO AND FE OXIDES. BRECCIATION DECREASED OR ABSENT IN NARROWER PARTS. ORE APPEARS AS RIBBONS OF FINE-GRAINED QUARTZ AND FINE-GRAINED PYRITE/MARCASITE INTERSPERSED WITH WHITE QUARTZ CONTAINING DISSEMINATED PYRITE/MARCASITE AND LATEGANGUE MINERALS. HIGHER GRADE ORE GENERALLY FOUND WHERE SULFIDES CONTAIN RELATIVELY LESS MARCASITE. LOW-MARCASITE HIGH-GRADE ORE SHOWS AG/AU RATIOS OF 50:1 TO 100:1; HIGH-MARCASITE LOWER GRADE ORE SHOWS RATIO OF 10:1. HIGHER METAL VALUES USUALLY FOUND IN CENTER OF HANGING WALL PORTIONS. SECOND TYPE OF MATERIAL IS BROKEN, HIGHLY ALTERED WALLROCK IN SLABS AND BRECCIA
Deposit LENSES NEAR FOOTWALL. THIRD TYPE OF MATERIAL IS POST-MINERALIZATION, UNSILICIFIED, INCOMPETENT FAULT GOUGE TOWARD FOOTWALL.

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.

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.