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Turning Point Mine

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

Geologic information

Identification information

Deposit ID 10102392
MRDS ID M000048
Record type Site
Current site name Turning Point Mine
Related records 10162022

Geographic coordinates

Geographic coordinates: -111.89654, 32.6001 (WGS84)
Elevation 480
Relative position ADJOINS JACK RABBIT ON W.

Site location context

Political divisions (FIPS codes)

Pinal(county)

Arizona(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

North Komelik(quadrangle 1:24,000 scale)

Casa Grande(quadrangle 1:100,000 scale)

Tucson(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Santa Rosa Wash(hydrologic unit)

Santa Cruz(hydrologic accounting unit)

Middle Gila(hydrologic subregion)

Lower Colorado(hydrologic region)

Federal lands

BIA(Federal land areas administered by BIA)

Geographic areas

Country State County
United States Arizona Pinal

Public Land Survey System information

Meridian Township Range Section Fraction State
Gila and Salt River 009S 004E 36 SE Arizona

Comments on the location information

  • N END OF SLATE MOUNTAINS. LAND STATUS INFORMATION FROM 1979.

Commodities

Commodity Importance
Silver Primary
Copper Primary
Lead Primary
Gold Secondary
Zinc Critical Tertiary
Molybdenum Tertiary
Vanadium Critical Tertiary

Materials information

Materials Type of material
Descloizite Ore
Galena Ore
Gold Ore
Vanadinite Ore
Willemite Ore

Analytical data

Result $18/T AU AND AG IN 1880-1902

Host and associated rocks

  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Intermediate Volcanic Rock > Andesite
    Stratigraphic age (youngest) Pliocene
  • Host or associated Host
    Rock type Sedimentary Rock > Carbonate > Limestone
    Rock unit name Escabrosa Limestone;
    Rock description Escabrosa Limestone;

Nearby scientific data

(1) -111.89654, 32.6001
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description Vein Is In Ne Striking, 65 Se Dipping Normal Fault

Ore body information

  • Strike N20E
    Dip 60E

Controls for ore emplacement

  • Limestone Cap As A Barrier, Andesite Permeability

Comments on the geologic information

  • TURNING POINT VEIN LIMITED ON W BY STEEP N STRIKING FAULT ZONE.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1898
Year of first production 1898
Year of last production 1946

Mining district

District name Slate District

Land status

Ownership category Private

Ownership information

  • Type Owner
    Owner O. T. Manning, E. L. Harris, W. M. Mischer

Comments on the production information

  • SOME HIGH GRADE ORE STOPPED AND SHIPPED IN 1911. MINE WORKED INTERMITTENTLY UNTIL 1946. 1913 REPORTED RECOVERY OF METALS IN AMALGAM AND CONC WAS ABOUT 60%. VALUES WERE $6-7/T, SOMETIMES OVER $100/T.

Comments on the reserve resource information

  • GREATES POTENTIAL FOR FURTHER PRODUCTION PROBABLY LIES IN THE 600 FT OF UNEXPLORED VEIN PARTIALLY EXPOSED NE OF SHAFT. THE VEIN SPLIT JUNCTION 300 FT NE OF SHAFT WOULD PROVIDE A LIKELY TARGET FOR EXPLORATION . SEARCH FOR W EXTENSION OF TURNING POINT VEIN W OF THE N-STRIKING W-DIPPING FAULT AGAINST WHICH PAST OPERATIONS CEASED, MIGHT BE PROFITABLE.

Workings at the site

  • Type of workings Surface/Underground
    Length 259.08M
    Overall depth 68.58M
    Overall length 609.6M

Comments on the workings information

  • LEVELS AT 74, 154, 184, AND 215 FT, SURFACE TRENCHING. 10 STAMP MILL BUILT IN 1902.

Comments on development

  • OPERATORS INCLUDED O.T. MANNING, F.C. MANNING, BARTLETT MCNATT

Reference information

Bibliographic references

  • Deposit

    HAMMER, 1961, M.S. THESIS, UNIV OF AZ.

  • Deposit

    USBM FILE DATA.

  • Deposit

    ABGMT FILE DATA.

  • Production

    ABGMT FILE DATA, HAMMER, 1961

  • Reserve-Resource

    HAMMER, 1961

General comments

Subject category Comment text
Deposit HIGHEST GRADE ORE IN ANDESITE PORPHYRY. MINERALIZATION WEAKENS DOWNWARD.
Deposit THIS REPORT REPRESENTS A MERGER OF ORIGINAL RECORD M000048 WITH RECORD M000048 OF JAN WILT IN MOLYBDENUM FILE, CONTACT PERSON T.G. THEODORE, USGS.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-APR-1983 Peterson, Jocelyn A. U.S. Geological Survey GENERAL RECORD CLEANUP
Updater 01-MAY-1995 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.