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Jumbo Group

Occurrence in Esmeralda county in Nevada, United States with commodities Gold, Silver, Copper, Tin, Zinc
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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. Ore body information
  13. Controls for ore emplacement
  14. Economic information about the deposit and operations
  15. Mining district
  16. Land status
  17. Production statistics
  18. Workings at the site
  19. Links to other databases
  20. Bibliographic references
  21. General comments
  22. Reporter information

Geologic information

Identification information

Deposit ID 10046713
MRDS ID M241914
Record type Site
Current site name Jumbo Group
Alternate or previous names Part of Goldfield Consolidated Mines Co. After 1906-7. Jumbo, Clermont, Lucky Boy, Grizzly Bear Claims

Geographic coordinates

Geographic coordinates: -117.22008, 37.71634 (WGS84)
Elevation 1737
Relative position ABOUT 1 MILE N 50 E OF CENTER OF GOLDFIELD

Site location context

Political divisions (FIPS codes)

Esmeralda(county)

Nevada(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Goldfield(quadrangle 1:24,000 scale)

Goldfield(quadrangle 1:100,000 scale)

Goldfield(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Ralston-Stone Cabin Valleys(hydrologic unit)

Central Nevada Desert Basins(hydrologic accounting unit)

Central Nevada Desert Basins(hydrologic subregion)

Great Basin(hydrologic region)

Geographic areas

Country State County
United States Nevada Esmeralda

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 002S;003S 042E;042E 36 SW (36); NW (01) Nevada

Comments on the location information

  • BETWEEN COMBINATION FRACTION AND GOLDFIELD MERGER PROPERTIES. . UTM IS TO SHAFT NEAR CENTER OF NORTH END OF CLAIM GROUP. ; INFO FROM LAND.ST :1982

Commodities

Commodity Importance
Gold Primary
Silver Secondary
Copper Secondary
Tin Critical Tertiary
Zinc Critical Tertiary

Materials information

Materials Type of material
Famatinite Ore
Sphalerite Ore
Wurtzite Ore
Alunite Gangue
Gypsum Gangue
Kaolinite Gangue
Limonite Gangue
Pyrite Gangue
Quartz Gangue

Alteration

  • (Local) Alunitization, Pyritization

Analytical data

Result SPECTROSCOPIC ANALYSES IN 1939-40 REVEALED PRESENCE OF SMALL AMOUNTS OF TIN IN THIS ORE.

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 > Dacite
    Stratigraphic age (youngest) Miocene
    Chronological age 21.5
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Dacite
    Rock unit name Mill Town Andesite
    Rock description Mill Town Andesite
    Stratigraphic age (youngest) Miocene
    Chronological age 21.5

Nearby scientific data

(1) -117.22008, 37.71634
ListMap

Economic information

Ore body information

  • General form TABULAR TO IRREGULAR
    Strike N16W
    Dip 90 TO STEEPLY E
    Thickness 6.1M
    Length 213.36M

Controls for ore emplacement

  • Fissures In A Sheeted Zone; Caldera Ring Fracture Zone

Comments on the geologic information

  • GRIZZLY BEAR CLAIM DIFFERED FROM MOST IN GOLDFIELD DISTRICT IN THAT IT YIELDED ORE HIGH IN SILVER AND COPPER AS WELL AS GOLD (22,500 TONS AVERAGED 1.07 OZ/T AU, 5.58 OZ/T AG, 4.21% CU) WHICH CAME FROM IMMEDIATELY ABOVE THE CAMBRIAN BASEMENT.

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1903
Discoverer Charles Taylor Of Tonopah, Grubstaked By George Kernick And George Mcclelland.

Mining district

District name Goldfield District

Land status

Ownership category Private

Production statistics

  • Year 1915
    Period 1913-1915
    Material AUCUAGORE
    Accuracy Estimate
    Description Cp_Grade: ^Avg. 1.07 Oz/T Au, 5.58oz/T Ag, 4.21% Cu (Grizzly Bear)
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Copper Copper 4wt-pct
    Silver Silver 158g/mt
    Gold Gold 30g/mt
  • Year 1918
    Period 1917-1918
    Material AUCUAGORE
    Accuracy Estimate
    Description Cp_Grade: ^Avg 0.31oz/T Au, 1.13% Cu (Grizzly Bear Claim)
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Copper Copper 1wt-pct
    Gold Gold 9g/mt

Comments on the production information

  • PRODUCTION FIGURES ARE PROBABLY LOWER THAN ACTUAL ORE REMOVED. PRODUCTION WAS PRIMARILY BY LESSEES

Workings at the site

  • Type of workings Underground
    Overall depth 3.2M

Comments on the workings information

  • MORE THAN 6 LEASES WERE WORKED ON THE JUMBO IN THE EARLY YEARS, EACH THROUGH A DIFFERENT SHAFT AND NOT ALL CONNECTING. MAIN SHAFT IN 1905WAS SUNK TO 450 FT. MANY LEVEL WORKINGS, ALSO. CLERMONT SHAFT WAS SUNK TO 1050 FT BY 1909 UNDER GOLDFIELD CONS. OPERATION

Comments on development

  • 50-FT SHAFT WAS SUNK IN-1903. OWNERS LET OUT 11 LEASES ON THE JUMBO IN 1904, FOR 8 MONTHS. IN THE 8 MONTHS ORE WITH GROSS VALUE OF $1,690,000 WAS REMOVED FROM THE CLAIM. JUMBO MINING CO. WAS INCORPORATED IN 1904. LITIGATION AMONG PARTNERS IN 1904 HALTED MINING AT THE JUMBO THROUGH 1905. THE JUMBO WAS ACQUIRED BY GEORGE WINGFIELD FOR GOLDFIELD CONSOLIDATED MINES CO, IN 1906. CALUMET AND HECLA CONSOLIDATED COPPER CO. IN IN 1935-38 DISCOVERED A MODERATE-SIZED ORE BODY IN THE SHALLOW LEVELS OF THE CLERMONT VEIN

Reference information

Bibliographic references

  • Deposit

    SHAMBERGER, H.A., 1982, THE STORY OF GOLDFIELD, NEVADA HISTORICAL PRESS, CARSON CITY, NEV. 240 P.

  • Deposit

    COLLINS, E.A., 1907 MINING AND SCIENTIFIC PRESS

  • Deposit

    NBMG REPORT 33, P. 77-86.

  • Deposit

    RIDGE, J.D., 1974, GSA MEM 131.

  • Deposit

    SEARLS, F., 1948, NBMG BULL 48, P.18.

  • Deposit

    TOLMAN AND AMBROSE, 1934, ECON GEOL VOL. 29, P. 255-279.

  • Deposit

    UNPUBLISHED MAPS OF CLERMONT MINE FROM CALUMET & HECLA'S OPERATIONS IN 1930'S: NBMG FILE 91, ITEMS 25, 26, 27, 28

  • Production

    SHAMBERGER, 1982, P. 199; GSA MEMOIR 131, 1974; NBMG BULL 48, P. 17.

General comments

Subject category Comment text
Deposit DISTINCT ZONE OF PARALLEL SHEETING. HIGH-GRADE ORE IS WITHIN OXIDIZED ZONE

Reporter information

Type Date Name Affiliation Comment
Reporter 01-AUG-1982 La Pointe, D.D. (Tingley, J.V.) Nevada Bureau of Mines and Geology

Beyond USGS

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

Maps centered on this site

Authoritative Nevada resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.