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Jumbo-Morovoratz Mine

Past Producer in La Plata county in Colorado, United States with commodities Silver, Gold, Copper, Lead
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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. Economic information about the deposit and operations
  14. Mining district
  15. Land status
  16. Ownership information
  17. Workings at the site
  18. Links to other databases
  19. Bibliographic references
  20. General comments
  21. Reporter information

Geologic information

Identification information

Deposit ID 10101872
MRDS ID D010829
Record type Site
Current site name Jumbo-Morovoratz Mine
Alternate or previous names Patented Claims: Morovoratz, MS 88, Morovoratz, MS 91, Jumbo, MS 19879
Related records 10215658

Geographic coordinates

Geographic coordinates: -108.08009, 37.35473 (WGS84)
Elevation 2719
Relative position 12.2 MILES N 66 W FROM DURANGO

Site location context

Political divisions (FIPS codes)

La Plata(county)

Colorado(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Hesperus(quadrangle 1:24,000 scale)

Cortez(quadrangle 1:100,000 scale)

Cortez(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Middle San Juan(hydrologic unit)

Upper San Juan(hydrologic accounting unit)

San Juan(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 La Plata

Public Land Survey System information

Meridian Township Range Section Fraction State
New Mexico 036N 011W 21,28,29 SW (21); NW OF NW (28); E2 OF NE (29) 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 LA PLATA RIVER BELOW BAY CITY GULCH, 3.25 MILES SSW OF LA PLATA TOWNSITE (UNSURVEYED SECTIONS). ; INFO FROM LAND.ST :1974

Commodities

Commodity Importance
Silver Primary
Gold Primary
Copper Secondary
Lead Secondary

Materials information

Materials Type of material
Chalcopyrite Ore
Gold Ore
Quartz Gangue

Alteration

  • (Local) Alteration Of Cu Sulfide

Mineral occurrence model information

Model code 85
USGS model code 22c
Deposit model name Polymetallic veins
Mark3 model number 46

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
    Rock unit name Porphyritic Rocks--Diorite-Monzonite Porphyry
    Rock description Porphyritic Rocks--Diorite-Monzonite Porphyry
    Stratigraphic age (youngest) Paleocene
    Stratigraphic age (youngest) Paleocene
    Stratigraphic age (youngest) Late Jurassic
  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Sandstone
    Rock unit name Entrada Sandstone;Pony Express Limestone Member Of Wanakah Formation
    Rock description Entrada Sandstone;Pony Express Limestone Member Of Wanakah Formation
  • Host or associated Host
    Rock type Sedimentary Rock > Carbonate > Limestone

Nearby scientific data

(1) -108.08009, 37.35473
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description San Juan Uplift, Four Corners Platform
Type of structure Local
Structure description La Plata Dome, May Day-Idaho Fault System

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1875
Year of first production 1875
Year of last production 1932

Mining district

District name California (La Plata) District

Land status

Ownership category Private
Area name San Juan N. F.

Ownership information

  • Type Operator
    Owner Golden West Development Co. (Jumbo Mine)
    Home office Ft. Worth, Tx.
    First year 1934
  • Type Owner
    Owner Jumbo Mining Co. (Jumbo Mine)
    Home office Durango, Co.
    First year 1934

Comments on the production information

  • PARTIAL PRODUCTION RECORD. PRODUCTION FIGURES UNAVAILABLE FOR 1870S AND 1880S, BUT CONSIDERED SMALL. 1912 PRODUCTION CREDITED TO MOROVORATZ; 1915-1920 PRODUCTION CREDITED TO JUMBO; 1914 AND 1922-1932 PRODUCTION CREDITED TO JUMBO-MOROVORATZ.

Workings at the site

  • Type of workings Underground
    Length 1301.5M

Comments on the workings information

  • MOROVORATZ CROSSCUT TUNNEL DRIVEN N 83 W FOR 220 FT, THENCE N 32 W FOR 110 FT, CUTTING VEINS AT 260 AND 320 FR FROM PORTAL. FIRST VEIN DEVELOPED BY 60-FT DRIFT DRIVEN S 24 W; SECOND VEIN (MOROVORATZ FAULT) DEVELOPED BY 70-FT NE DRIFT AND 700-FT DRIFT DRIVEN GENERALLY S 60 W, WITH 320 FT OF ADDITIONAL TUNNEL DEVELOPMENT AT END. SECOND CROSSCUT DRIVEN GENERALLY N 60 W FOR 200 FT FROM POINT IN SW DRIFT 40 FT FROM MAIN CROSSCUT, THENCE BRANCHING INTO 380-FT DRIFT DRIVEN GENERALLY S 50 W AND 130-FT DRIFT DRIVEN GENERALLY N 60 E, THE END OF WHICH IS BOTTOM OF WINZE FROM END OF UPPER NONA TUNNEL; IN SW DRIFT, RAISE OR WINZE AT 40 FT FROM BRANCH AND SHAFT AT 140 FT FROM BRANCH. RUBY TUNNEL LOCATED 550 FT NW OF MOROVORATZ, DRIVEN GENERALLY S 50 W FOR 280 FT. CUNNINGHAM TUNNEL LOCATED 470 FT SE OF MOROVORATZ, DRIVEN GENERALLY WESTWARD FOR 1680 FT; AT 1100 FT FROM PORTAL, JUMBO VEIN DEVELOPED BY 180-FT DRIFT DRIVEN GENERALLY N 35 E AND 230-FT DRIFT DRIVEN GENERALLY S 45 W, BOTH WITH APPROX 160
  • FT OF SUBSIDIARY DEVELOPMENT DRIFT.

Comments on development

  • MOROVORATZ, ONE OF FIRST VEINS DISCOVERED IN DISTRICT, OPERATED FROM 1870S AT LEAST UNTIL 1883, IDLE FOR AT LEAST 20 YEARS, REVIVED IN 1907, AND PRODUCED INTERMITTENTLY FROM 1912 TO 1932.

Reference information

Bibliographic references

  • Deposit

    ECKEL, E.B., AND OTHERS, 1949, GEOLOGY AND ORE DEPOSITS OF THE LA PLATA DISTRICT, COLORADO: USGS PROF. PAPER 219, P. 69-70, 132, PL. 23.

  • Deposit

    COLORADO DIV. MINES INF. REPTS.

  • Deposit

    BLM MINERAL SURVEYS MS 88, 91, 19879

  • Production

    ECKEL AND OTHERS, 1949, P. 132 (AS COMPILED FROM USBM RECORDS)

General comments

Subject category Comment text
Deposit COUNTRY ROCKS CONSIST OF ENTRADA AND JUNCTION CREEK SANDSTONES AND WANAKAH FM LIMESTONE AND MARL INTRUDED BY DIORITE-MONZONITE PORPHYRY SILLS AND DIKES AND COMPLEXLY FAULTED. ORE APPEARS TO HAVE BEEN DEVELOPED IN MOROVORATZ MINE ALONG 6- TO 8-INCH SHEAR ZONE BETWEEN ENTRADA SANDSTONE AND WANAKAH FM MARL MEMBER AND ALONG MOROVORATZ FAULT ALSO SEPARATING SANDSTONE AND MARL. IN NW PART OF MINE, JUMBO VEIN IS A 1- TO 2-FT-WIDE SHEAR ZONE WITH 1- TO 3-INCH GOUGY BRECCIA IN ENTRADA SANDSTONE. RUBY TUNNEL EXPLORED VEIN CUTTING JUNCTION CREEK SANDSTONE. IN CUNNINGHAM TUNNEL, JUMBO VEIN IS BROAD SHEAR ZONE CUTTING ENTRADA SANDSTONE, WANAKAH FM MARL, AND PORPHYRY DIKE.
Deposit Discovery Year: 1870S

Reporter information

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

Beyond USGS

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

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Authoritative Colorado resources

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