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  3. Mineral Resource Data System (MRDS)

Casa Grande Santa Cruz

Prospect in Pinal county in Arizona, United States with commodity 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. Nearby scientific data
  9. Ore body information
  10. Economic information about the deposit and operations
  11. Mining district
  12. Land status
  13. Ownership information
  14. Reserves and resources
  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 10234953
MRDS ID TC35431
MAS/MILS ID 0040210076
Record type Site
Current site name Casa Grande Santa Cruz
Alternate or previous names Casa Grande, Casa Grande West

Geographic coordinates

Point of reference Ore Body
Geographic coordinates: -111.88212, 32.89319 (WGS84)
Elevation 403
Location accuracy 100(meters)

Site location context

Political divisions (FIPS codes)

Pinal(county)

Arizona(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Stanfield(quadrangle 1:24,000 scale)

Casa Grande(quadrangle 1:100,000 scale)

Tucson(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Lower Santa Cruz(hydrologic unit)

Santa Cruz(hydrologic accounting unit)

Middle Gila(hydrologic subregion)

Lower Colorado(hydrologic region)

Geographic areas

Country State County
United States Arizona Pinal

Public Land Survey System information

Meridian Township Range Section Fraction State
Gila and Salt River 006 S 004 E 13 SE Arizona

Commodities

Commodity Importance
Copper Primary

Materials information

Materials Type of material
Covellite Unknown

Nearby scientific data

Ore Body (1) -111.88212, 32.89319
ListMap

Economic information

Ore body information

  • Area 650HA
    Depth to top 457M
    Field Value
    MAS Matrix # 1
    MAS Column # 1
    Type of Orebody #1 DISSEMINATED
    Shape of Orebody #1 MASSIVE
    Primary mode of Origin HYDROTHERMAL
    Secondary mode of Origin OXIDATION
    Primary Ore Control LITHOLOGY
    Secondary Ore Control FRACTURING
    Degree of Wallrock Alter. UNKNOWN
    Type of Wallrock Alter. #1 UNKNOWN
    Minimum Depth to Top 457
    Total Surface Area (HA) 650
    Date of Last Modification 910829

Comments on the geologic information

  • CHALCOCITE IS THE ONLY KNOWN MINERAL. THE OTHER COPPER SULFIDES AND OXIDE MINERALS ARE UNKNOWN.
  • THE ORACLE GRANITE COUNTRY ROCK HAS BEEN INTRUDED BY A LARAMIDE INTRUSIVE OF QTZ. MONZONITE. THE ORE BODY IS A CLASSIC "PORPHYRY" TYPE.

Economic information about the deposit and operations

Operation type Underground
Development status Prospect
Commodity type Metallic
Significant Yes
Discovery year 1976
Mining method Caving Methods - Block Caving
Milling method Flotation

Mining district

District name Casa Grande District

Land status

Ownership category Private

Ownership information

  • Type Owner
    Owner Asarco (American Smelting And Refining Co.), Freeport Mc Moran Gold Co.
    Year 1988
  • Type Operator
    Owner Casa Grande Copper Co.
    Home office Arizona
    Year 1988

Comments on the ownership information

  • CASA GRANDE COPPER COMPANY HAS BEEN ESTABLISHED AS THE OPERATOR OF THE PROPERTY.

Reserves and resources

  • Type In-situ
    Estimate year 1989
    Indicated 191000000mt ore
    Demonstrated 191000000mt ore
    Total resources 191000000mt ore
    Commodity Subtype Grade units Group Importance Year
    Copper Cu 0.7 wt-pct Copper Major 1989
  • Type In-situ
    Estimate year 2008
    Total endowment 1450000000mt ore
    Remarks Casa Grande West, Santa Cruz total endowment. Singer 2008 in PorCuEX2008.xls.
    Commodity Subtype Grade units Group Importance Year
    Copper 0.588 wt-pct Copper Primary 2008

Comments on the reserve resource information

  • ANNUAL REPORTS MORE RECENT THAN 1978 MAKE NO MENTION OF THIS DEPOSIT.
  • GRADE IS IN TERMS OF ACID-SOLUBLE FORMER OWNERS: HANNA MINING & GETTY OIL CURRENT OPERATOR: SANTA CRUZ JOINT VENTURE THIS PROPERTY ENTRY ALSO INCLUDES THE SANTA CRUZ PORTION OF THE MINERALIZED BODY. SANTA CRUZ JT. VT. WAS FORMED TO INVESTIGATE THE POTENTIAL FOR TRUE IN-SITU LEACHING IN CONJUNCTION WITH U.S. BUREAU OF MINES RESEARCH. DEMONSTRATED RESOURCE IS FOR BOTH SULFIDE AND OXIDE AS FOLLOWS: SULFIDE: 205,665,000 MT @ 0.81% CU OXIDE: 209,416,000 MT @ 1.08% CU TOTAL 415,081,000 MT @ 0.95% CU (INCLUDES 97,000,000 MT @ 0.7% CU IN IN-SITU LEACH PROJECT)

Workings at the site

  • Type of workings Underground
    Overall depth 1040M
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1
    Status of Mining Method PROPOSED
    Mining Method BLOCK CAVING 10-79
    Percent Waste Rock 0
    Percent Recovery 90
    Hardness of Rock UNKNOWN
    Rock Characteristics UNKNOWN
    Rock Support Chars. UNKNOWN
    Mine Support Chars. UNKNOWN
    Number of Shafts 4
    Capacity 30000
    Capacity Units MT ORE/DAY
    Unit Production Cost 7.58
    Units of Production $/MT ORE
    Operating Days per Year 357
    Operating Shifts per Day 3
    Year of Information 1978

Reference information

Bibliographic references

  • Reserve-Resource

    AMCJ, 2/89, P. 16; DAHL, LINDA J., SUMMARY RPT.-CASA GRANDE

  • Reserve-Resource

    USMB.

  • Deposit

    THE GETTY OIL COMPANY ANNUAL REPORT OF 1978.

  • Deposit

    MINING MAGAZINE. IN SITU COPPER MINING TESTS IN U.S.A.

  • Deposit

    DEC. 1988. P. 460.

  • Deposit

    AHLNESS., MILLENACKER. BUREAU OF MINES INVESTIGATES IN SUTU

  • Deposit

    COPPER MINING. FEB., MARCH. 1989. PP. 9-15.

  • Deposit

    THE MINING RECORD. ASARCO TAKES LEGAL ACTION IN MINING

  • Deposit

    RESEARCH VENTURE. MACH 21, 1990. P. 3.

  • Deposit

    MINING JOURNAL, LONDON, DRAFT MINE DESIGN. SEPT. 29, 1989.

  • Deposit

    MINING ENGINEERING. IN SITU COPPER MINING AT SANTA CRUZ:

  • Deposit

    A PROJECT UPDATE. AUGUST 1991. PP. 1031-1034.

  • Deposit

    A MINING RESEARCH CONTRACT REPORT. GENERIC IN SITU COPPER

  • Deposit

    MINE DESIGN MANUAL. VOLUME 111, LAKESHORE FIELD

  • Deposit

    EXPERIMENT AND DESIGN OF COMMERCIAL SCALE OPERATION.

  • Deposit

    BUREAU OF MINES U.S. DEPT. OF THE INTERIOR. APRIL 1988.

  • Deposit

    PAY DIRT. SANTA CRUZ IN SITU COPPER LEACHING RESEARCH

  • Deposit

    LOOKING GOOD. FEB. 1992. P. 3B.

  • Deposit

    AMERICAN MINING MANUAL. COPPER PROJECT GETS GREEN LIGHT.

  • Deposit

    1994. P. 7

  • Deposit

    SKILLINGS MINING REVIEW. ARIZ. IN SITU MINING RESEARCH

  • Deposit

    PROJECT PROCEEDS. NOV. 26, 1994. P.15.

  • Deposit

    SOUTHWESERN PAY DIRT. INDUSTRY-GOVERNMENT PROJECT HAS BIG

  • Deposit

    POTENTIAL. FEB., 1995. PP.4A-9A.

  • Deposit

    MINING RECORD. PILOT-SCALE TEST BEGINS AT SANTA CRUZ

  • Deposit

    IN-SITU PROJECT. V.107/N8 FEB. 21, 1996. P. 4.

General comments

Subject category Comment text
Deposit PROPERTY VISITED BY R.C. SMITH & M. DALEY ON 3/20/78 MR JOHN STONE-PROJECT MANAGER PROVIDED SOME INFORMATION AND INDICATED A BLOCK CAVE MINING METHOD WOULD BE POSSIBLE THE PROPERTY WAS EVALUATED USING A.A. MATHEWS WITH JUNE 1977 COSTS THE HANNA MINING COMPANY 1977 ANNUAL REPORT PROVIDED RESERVES AND GRADE AS OF 06/83 THERE HAS BEEN NO CHANGE IN THE STATUS OF THIS PROPERTY SINCE THE ORIGINAL REPORT; IT REMAINS AN EXPLORED PROSPECT. MINOR CORRECTIONS MADE BY M.B. SAWYER IN 8/91 BASED ON DATA FROM 1987-88.

Reporter information

Type Date Name Affiliation Comment
Reporter 20-SEP-1996 Smith / Jrs U.S. Bureau of Mines

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

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.