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La Fortuna Mine

Past Producer in Yuma county in Arizona, United States with commodities Gold, Silver, Iron, Copper
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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. Ore body information
  12. Controls for ore emplacement
  13. Economic information about the deposit and operations
  14. Mining district
  15. Land status
  16. Workings at the site
  17. Links to other databases
  18. Bibliographic references
  19. General comments
  20. Reporter information

Geologic information

Identification information

Deposit ID 10027250
MRDS ID M002626
Record type Site
Current site name La Fortuna Mine
Alternate or previous names Fortuna
Related records 10113627

Geographic coordinates

Geographic coordinates: -114.3305, 32.55176 (WGS84)
Elevation 244
Relative position ABOUT 20 MILES FROM WELLTON AND 28 MILES SE OF YUMA.

Site location context

Political divisions (FIPS codes)

Yuma(county)

Arizona(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Fortuna Mine(quadrangle 1:24,000 scale)

Yuma(quadrangle 1:100,000 scale)

El Centro(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Yuma Desert(hydrologic unit)

Lower Colorado(hydrologic accounting unit)

Lower Colorado(hydrologic subregion)

Lower Colorado(hydrologic region)

Federal lands

USAF(Federal land areas administered by USAF)

Geographic areas

Country State County
United States Arizona Yuma

Public Land Survey System information

Meridian Township Range Section Fraction State
Gila and Salt River 010S 020W 16,21 Arizona

Commodities

Commodity Importance
Gold Primary
Silver Primary
Iron Secondary
Copper Secondary

Materials information

Materials Type of material
Gold Ore
Hematite Ore
Limonite Ore
Malachite Ore
Silver Ore
Garnet Gangue
Quartz Gangue
Specularite Gangue

Alteration

  • (Local) The Wall-Rock Alteration Accompanying La Fortuna Vein Consists Mainly Of Carbonatization And Silicification. Such Alteration Together With The Structure, Texture, And Mineralogy Of The Vein, Point To Deposition In The Lower Portion Of The Mesothermal Zone.

Analytical data

Result AU AVERAGED $15 TO $16 PER TON AND 890 FINE

Host and associated rocks

  • Host or associated Associated
    Rock type Metamorphic Rock > Amphibolite
    Stratigraphic age (youngest) Late Cretaceous
    Stratigraphic age (youngest) Paleocene
  • Host or associated Associated
    Rock type Plutonic Rock > Pegmatite
  • Host or associated Associated
    Rock type Plutonic Rock > Granitoid > Granite
  • Host or associated Host
    Rock type Metamorphic Rock > Schist
  • Host or associated Host
    Rock type Metamorphic Rock > Gneiss

Nearby scientific data

(1) -114.3305, 32.55176
ListMap

Economic information

Ore body information

  • General form LINEAR
    Strike S40W
    Dip 70SE
    Thickness 243.84M
    Length 30.48M
    Width 3.66M
    Depth to top 0M
    Depth to bottom 335.28M

Controls for ore emplacement

  • La Fortuna Vein Strikes S40w And Dips 70se. It Outcrops In Two Branches Of Which One Is 20 Feet Long By 12 Feet Wide And The Other 30 Feet Long By 5 Feet Wide. These Branches Are Reported To Have Joined At A Depth Of 500 Feet, Forming An Ore Body Approximately 100 Feet Long By 1 1/2 To 12 Feet Wide. The Ore Body Was Lost At A Fault Near The 800 Foot Level, And Only A Small Segment, Between The 900 And 1100 Foot Levels, Was Found By Further Exploration

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant Yes
Discovery year 1895
Year of first production 1896
Year of last production 1941

Mining district

District name Fortuna District

Land status

Ownership category Military Reservation
Area name Luke Air Force Base Bombing Range

Workings at the site

  • Type of workings Underground
    Length 213.36M
    Overall depth 304.8M

Comments on the workings information

  • WORKINGS CONSIST OF TWO INCLINED SHAFTS, WITH SEVERAL HUNDRED FEET OF DRIFTS, STOPES.

Reference information

Bibliographic references

  • Deposit

    ELSING, M.J., HEINEMAN, R.E.S., 1936, ARIZONA METAL PRODUCTION: ARIZ. B.M. BULLETIN 140, P. 104.

  • Deposit

    WILSON, E.D., 1933, GEOLOGY AND MINERAL DEPOSITS OF SOUTHERN YUMA COUNTY, ARIZONA: ARIZ. B.M. BULLETIN 134 P. 189

  • Deposit

    WILSON, E.D., CUNNINGHAM, J.B., BUTLER, G.M., 1934, ARIZONA LODE GOLD MINES AND GOLD MINING: ARIZ. B.M. BULLETIN 137, P. 158.

  • Deposit

    SAWYER, M.B., GURMENDI, A.C., DALEY, M.R., AND HOWELL, S.B., 1992, PRINCIPAL DEPOSITS OF STRATEGIC AND CRITICAL MINERALS IN ARIZONA: U.S. BUREAU OF MINES SPECIAL PUBLICATION, 334 P.

  • Other Database

    CIMRI

  • Production

    A.B.M. BULLETIN 134, P. 198; A.B.M. BULLETIN 140, P. 104. (13) KEITH, S.B., 1979

General comments

Subject category Comment text
Deposit MANY BRANCHING AND INTERSECTING FAULTS WITH VEINS IN SCHIST.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-APR-1972 Gere, W. U.S. Geological Survey
Updater 01-NOV-1979 Hall, R. K. (Creasey, S. C.) U.S. Geological Survey
Updater 01-FEB-1994 Orris, Greta J. U.S. 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 Arizona resources

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