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Mcmillan Prospect

Occurrence in Yuma county in Arizona, United States with commodities Copper, Uranium
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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. Host and associated rocks
  9. Nearby scientific data
  10. Ore body information
  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. General comments
  19. Reporter information

Geologic information

Identification information

Deposit ID 10027214
MRDS ID M002497
Record type Site
Current site name Mcmillan Prospect

Geographic coordinates

Geographic coordinates: -113.90994, 32.3887 (WGS84)
Elevation 427
Relative position NORTHERN PORTION OF THE CABEZA PRIETA MTNS, ON NW FLANK 25.5 MI BY ROAD SE OF WELTON.

Site location context

Political divisions (FIPS codes)

Yuma(county)

Arizona(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Buck Peak(quadrangle 1:24,000 scale)

Cabeza Prieta Mountains(quadrangle 1:100,000 scale)

Ajo(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Lower Gila(hydrologic unit)

Lower Gila(hydrologic accounting unit)

Lower Gila(hydrologic subregion)

Lower Colorado(hydrologic region)

Federal lands

FWS(Federal land areas administered by FWS)

Geographic areas

Country State County
United States Arizona Yuma

Public Land Survey System information

Meridian Township Range Section Fraction State
Gila and Salt River 012S 016W 09 Arizona

Commodities

Commodity Importance
Copper Primary
Uranium Secondary

Materials information

Materials Type of material
Chrysocolla Ore
Limonite Ore
Malachite Ore

Analytical data

Result SELECTED SAMPLE CONTAINED 0.034% U, 7.69% CU

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Pegmatite
    Stratigraphic age (youngest) Late Cretaceous
    Stratigraphic age (youngest) Pliocene
  • Host or associated Host
    Rock type Metamorphic Rock > Schist

Nearby scientific data

(1) -113.90994, 32.3887
ListMap

Economic information

Ore body information

  • General form IRREGULAR STRINGERS
    Strike N34W
    Dip 68SW
    Length 64.01M

Controls for ore emplacement

  • Vein Occurs In Fracture Zone

Comments on the geologic information

  • AT SOME PLACES IN THE MINE WORKINGS AND ON THE DUMPS, RADIOACTIVITY IS AS MUCH AS FIVE TIMES THE BACKGROUND RADIOACTIVITY. A STOCKPILE OF COPPER-STAINED MATERIAL PRESUMABLY MINED FROM ONE OF THE ADITS GAVE READINGS OF NEARLY 0.5 MR PER HR ON A SCINTILLATION METER. ALTHOUGH IT IS POSSIBLE THAT THE MCMILLIAN PROSPECT CONTAINS LOCAL CONCENTRATIONS OF URANIUM ORE, MOST OF THE RADIOACTIVE ROCK ON THE PROPERTY IS BELOW COMMERCIAL GRADE.

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic
Deposit size Small
Significant No

Mining district

District name La Posa District

Land status

Ownership category Federal
Area name Luke Air Force Base

Comments on the production information

  • NO PRODUCTION RECORD

Workings at the site

  • Type of workings Surface/Underground
    Length 6.1M

Comments on the workings information

  • PROPERTY DEVELOPED BY SHALLOW WORKINGS, TWO SHORT ADITS, AND AN OPENCUT.

Reference information

Bibliographic references

  • Deposit

    WILSON, E.D., 1933, GEOLOGY AND MINERAL DEPOSITS OF SOUTHERN YUMA COUNTY, ARIZONA: ARIZONA BUREAU OF MINES BULLETIN 139, P. 163.

  • Deposit

    GRADGER, H.C., RAUP, R.B., 1962, RECONNAISSANCE STUDY OF URANIUM DEPOSITS IN ARIZONA: U.S.G.S. BULLETIN 1147-A, P. 48.

General comments

Subject category Comment text
Deposit DUPLICATE RECORD M002015 HAS BEEN DELETED.

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

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.