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Jumbo Extension Mining Co.

Past Producer in Esmeralda county in Nevada, United States with commodities Gold, Silver, Copper, Tin, Bismuth
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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. Links to other databases
  19. Bibliographic references
  20. General comments
  21. Reporter information

Geologic information

Identification information

Deposit ID 10046712
MRDS ID M241913
Record type Site
Current site name Jumbo Extension Mining Co.
Alternate or previous names Velvet, Paloverde Claims

Geographic coordinates

Geographic coordinates: -117.21841, 37.71828 (WGS84)
Elevation 1743
Relative position ABOUT A MILE S 35 E FROM TOP OF COLUMBIA MOUNTAIN

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 042E 36 S2 Nevada

Comments on the location information

  • ADJOINTS E. SIDE OF GOLDFIELD CONSOLIDATED MINES CO. CLAIMS . UTM IS TO WORKINGS IN N END OF CLAIM AREA. ; INFO FROM LAND.ST :(1972)

Commodities

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

Materials information

Materials Type of material
Famatinite Ore
Alunite Gangue
Kaolinite Gangue
Pyrite Gangue
Quartz Gangue

Alteration

  • (Local) Pyritization, Alunitization, Kaolinization

Analytical data

Result SPECTROSCOPIC ANALYSES IN 1939-1940 REVEALED PRESENCE OF SMALL AMOUNTS OF TIN IN THE 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 > Latite
    Stratigraphic age (youngest) Early Miocene
    Chronological age 21.25
    Dating method K-Ar
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Latite
    Stratigraphic age (youngest) Early Miocene
    Chronological age 21.25
    Dating method K-Ar

Nearby scientific data

(1) -117.21841, 37.71828
ListMap

Economic information

Ore body information

  • General form TABULAR TO IRREGULAR

Controls for ore emplacement

  • Caldera Ring Fracture Zone

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1903
Year of first production 1904

Mining district

District name Goldfield District

Land status

Ownership category Private

Production statistics

  • Year 1915
    Material ORE-AUAGCU
    Accuracy Estimate
    Description Ap_Grade: ^Averaged 1.35oz/Ton Au, 4.41oz/Tag, 2.79% Cu
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Ore Copper Copper 3wt-pct
    Ore Silver Silver 125g/mt
    Major Ore Gold Gold 38g/mt
  • Year 1916
    Period 1914-1916
    Material AUAG-CU ORE
    Accuracy Estimate
    Description Cp_Grade: ^Average 1.35 Oz/Ton Au, 4.41 Oz/Ton Ag, 2.79% Cu
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Gold Gold 38g/mt
    Ore Copper Copper 3wt-pct
    Ore Silver Silver 125g/mt

Comments on the workings information

  • SHAFT OVER 830 FT DEEP

Comments on development

  • VELVET CLAIM WAS SENDING SMALL SHIPMENTS OF GOLD ORE BY LATE 1904. THE VELVET WAS ACQUIRED BY THE JUMBO EXT. MINE CO. IN 1914 FROM THE ADJOINING GOLDFIELD MERGER MINES CO. MERGER HAD DONE EXPLORATORY WORK TO 1772 FT, THE DEEPEST IN THE DISTRICT (IN 1911). JUMBO EXT. THEN FOUND RICH ORE ON THE VELVET IN 1914-15. IT WAS INVOLVED IN LITIGATION IN 1915.

Reference information

Bibliographic references

  • Deposit

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

  • Deposit

    NBMG REPORT 33, P. 77-86

  • Deposit

    NBMG BULL 48, P. 17-18

  • Deposit

    RICHARD, T.A., MAY 1915, MIN. & SC1 PRESS, P. 797.

  • Deposit

    WEED, W.H., ED., 1922, THE MINES HANDBOOK, VOL. XV, P.1233.

  • Deposit

    LINCOLN, F.C., 1923, MINING DISTRICTS AND MINERAL RESOURCES OF NEVADA: RENO, NV. NEWSLETTER PUBLISHING CO.

  • Production

    SHAMBERGER, H.A., 1982, P.199. SEARLS, F., 1948, P. 17-18

General comments

Subject category Comment text
Deposit ONE ORE BODY ACTUALLY FILLED A SMALL EROSIONAL GULLY IN SHALE UNDERLY VOLCANICS AT 1750. FT LEVEL

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.