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  3. Mineral Resource Data System (MRDS)

Portland Mine

Past Producer in Esmeralda county in Nevada, United States with commodity Gold
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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. Host and associated rocks
  10. Nearby scientific data
  11. Controls for ore emplacement
  12. Economic information about the deposit and operations
  13. Mining district
  14. Land status
  15. Workings at the site
  16. Links to other databases
  17. Bibliographic references
  18. Reporter information

Geologic information

Identification information

Deposit ID 10046688
MRDS ID M241887
Record type Site
Current site name Portland Mine

Geographic coordinates

Geographic coordinates: -117.21785, 37.70051 (WGS84)
Elevation 1798
Relative position ABOUT 4 MILE ESE OF CENTER OF GOLDFIELD; ABOUT 0.4 MILE SOUTH OF THE FLORENCE MINE

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 003S 042E 01,02 SW (01); NW (02) Nevada

Comments on the location information

  • CLAIM EXTENDS FROM S END OF COMBINATION GROUP SSE TO MYERS MTN. UTM IS TO ONE SHAFT ON THE CLAIM. ; INFO FROM LAND.ST :(1972)

Commodities

Commodity Importance
Gold Primary

Materials information

Materials Type of material
Pyrite Gangue

Alteration

  • (Local) Strong Alteration

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 Associated
    Rock type Volcanic Rock (Aphanitic) > Intermediate Volcanic Rock > Andesite
    Rock unit name Milltown Andesite;Siebert Tuff
    Rock description Milltown Andesite;Siebert Tuff
    Stratigraphic age (youngest) Early Miocene
    Chronological age 21.25
    Dating method K-Ar
  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Mafic Volcanic Rock > Basalt
    Stratigraphic age (youngest) Early Miocene
    Chronological age 21.25
    Dating method K-Ar
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Pyroclastic Rock > Tuff
    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
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Intermediate Volcanic Rock > Andesite
    Stratigraphic age (youngest) Early Miocene
    Chronological age 21.25
    Dating method K-Ar
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Mafic Volcanic Rock > Basalt
    Stratigraphic age (youngest) Early Miocene
    Chronological age 21.25
    Dating method K-Ar

Nearby scientific data

(1) -117.21785, 37.70051
ListMap

Economic information

Controls for ore emplacement

  • Caldera Ring Fracture Zone

Comments on the geologic information

  • SOFT ALTERED OLIVINE BASALT CONTAINS MUCH DISSEMINATED PYRITE. GROUND IS VERY SOFT

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1906

Mining district

District name Goldfield District

Land status

Ownership category Private

Workings at the site

  • Type of workings Underground
    Overall depth 121.92M

Comments on the workings information

  • IN 1905, SHAFT WAS TO 250 FT. WITH LEVEL WORKINGS THERE. IN 1908 A LEVEL HAD BEEN RUN AT 400 FT. LEVEL

Reference information

Bibliographic references

  • Deposit

    RANSOME, F.L., 1909, USGS PP 66, P. 245

  • Deposit

    NBMG REPORT 33, P. 77-86.

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.