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Santa Cruz

Past Producer in Pinal county in Arizona, United States with commodities Copper, Molybdenum, Gold, Silver
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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. Mineral occurrence model information
  10. Host and associated rocks
  11. Nearby scientific data
  12. Geologic structures
  13. Ore body information
  14. Controls for ore emplacement
  15. Economic information about the deposit and operations
  16. Mining district
  17. Land status
  18. Ownership information
  19. Reserves and resources
  20. Workings at the site
  21. Links to other databases
  22. Bibliographic references
  23. General comments
  24. Reporter information

Geologic information

Identification information

Deposit ID 10113316
MRDS ID M030493
MAS/MILS ID 0040211072
Record type Deposit
Current site name Santa Cruz
Alternate or previous names Franny-Granny, Francisco Grande, Fanny-Granny, CASA GRANDE

Comments on the site identification

  • Data merged from Francisco Grande Deposit ID 10097042

Geographic coordinates

Geographic coordinates: -111.88242, 32.89979 (WGS84)
Elevation 405

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 005 E 19 13,24 Arizona

Comments on the location information

  • Info From Land.St :1964

Commodities

Commodity Importance
Copper Primary
Molybdenum Secondary
Gold Tertiary
Silver Tertiary

Materials information

Materials Type of material
Atacamite Ore
Chalcocite Ore
Chalcopyrite Ore
Chrysocolla Ore
Molybdenite Ore
Pyrite Ore
Covellite Unknown

Alteration

  • (Local) Hypogene and supergene

Mineral occurrence model information

Model code 53
USGS model code 17
Deposit model name Porphyry Cu
Mark3 model number 4

Host and associated rocks

  • Host or associated Host
    Rock type Plutonic Rock > Granitoid > Granite
    Rock unit name Oracle Granite
    Stratigraphic age (youngest) Mesoproterozoic
  • Host or associated Host
    Rock type Plutonic Rock > Granitoid > Monzonite
    Rock type qualifier dikes of biotite-quartz-feldspar porphyry
    Rock unit name quartz monzonite
    Stratigraphic age (youngest) Late Cretaceous
  • Host or associated Host
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite > Diabase
    Rock type qualifier Dikes
    Stratigraphic age (youngest) Proterozoic

Nearby scientific data

(1) -111.88242, 32.89979
ListMap

Economic information

Geologic structures

Type of structure Local
Structure name Faulting
Type of structure Regional
Structure name extension, horst and graben faulting,

Ore body information

  • Thickness 1700M
    Length 2000M
    Width 800M
    Depth to top 1600M
    Field Value
    Type of Orebody #1 DISSEMINATED
    Shape of Orebody #1 MASSIVE
    Primary mode of Origin HYDROTHERMAL
    Secondary mode of Origin OXIDATION
    Primary Ore Control IGNEOUS
    Secondary Ore Control FAULTING
    Date of Last Modification 911002
  • Area 650HA
    Depth to top 457M

Controls for ore emplacement

  • Intrusions, Faulting

Economic information about the deposit and operations

Operation type Underground
Development status Past Producer
Commodity type Metallic
Deposit size Large
Significant Yes
Discovery year 1976

Mining district

District name Francisco Grande Area
District name Casa Grande District

Land status

Ownership category Private
Ownership category Mixed

Ownership information

  • Type Owner-Operator
    Owner Asarco (American Smelting And Refining Co.)
    Year 1988
  • Type Owner-Operator
    Owner Freeport Mcmoran Copper Co.
    Year 1988
  • Type Joint Venture Operator
    Owner GRUPO MEXICO SA DE CV
    Interest 50
    Home office Campos Eliseos 400\nColonia Lomas de Chapultepec\nMexico D.F. MEX 11000\nMexico
    Year 1998
  • Type Joint Venture
    Owner McMoRan Exploration Inc
    Interest 50
    Home office PO Box 51777\n1615 Poydras Street\nNew Orleans LA 70112 \nUnited States
    Year 1998
  • Type Unknown
    Owner HANNA MINING CO
    Home office 100 Erieview Plaza\nCleveland OH 44114\nUnited States
    Year 1998
  • Type Unknown
    Owner TEXACO
    Home office 2000 Westchester Ave.\nWhite Plains NY 10650\nUnited States
    Year 1998

Reserves and resources

  • Type In-situ
    Name soluble copper ore
    Estimate year 1995
    Total resources 910000000mt
    Remarks Too deep for open pit, too low grade to be mined economically underground, must be leached in place. Asarco 1995 10K p. A3.
    Commodity Subtype Grade units Group Importance Year
    Copper 0.55 wt-pct Copper Primary 1995
  • Type In-situ
    Estimate year 1989
    Indicated 191000000mt ore
    Commodity Subtype Grade units Group Importance Year
    Copper Cu 0.7 wt-pct Copper Primary 1989
  • Type In-situ
    Estimate year 1984
    Total resources 350000000mt ore
    Commodity Subtype Grade units Group Importance Year
    Molybdenum Mo 0.01 wt-pct Molybdenum Trace 1984
    Copper Cu 1 wt-pct Copper Major 1984
  • Type In-situ
    Estimate year 1976
    Total resources 158730000mt ore
    Commodity Subtype Grade units Group Importance Year
    Copper Cu 1 wt-pct Copper Primary 1976

Comments on the reserve resource information

  • Reserves Also Contain Some Gold And Silver.

Workings at the site

  • Type of workings Underground
    Overall depth 1040M

Reference information

Bibliographic references

  • Reserve-Resource

    Arizona Department Of Mines And Mineral Resources. Unpublished, Public Files Data, 1988; Available Upon Request From Admmr, Phoenix, Az.

  • Other Database

    Cimri

  • Deposit

    Greeley, 1978, Admr Spec Rept No. 2, P. 83-87.

  • Geology

    Cook S S and Porter T M, 2005 - The Geologic History of Oxidation and Supergene Enrichment in the Porphyry Copper Deposits of Southwestern North America, in Porter T M, (Ed), Super Porphyry Copper and Gold Deposits: A Global Perspective, v1 pp 207-242

  • Geology

    Kreis, H.G., 1995, Geology of the Santa Cruz porphyry copper deposit; in Pierce, F.W. and Bolm, J.G., eds., Porphyry Copper Deposits of the American Cordillera, Arizona Geological Society, Digest 20, p. 364-365.

  • Reserve-Resource

    Pay Dirt. Casa Grande Copper Project On 'Back Shelf'. No. 522, Dec. 1982, P. 7.

  • Deposit

    Ullmer, 1978, Jour Geochem Expl, V.9, No. 2-3, P. 235-236.

  • Reserve-Resource

    Pay Dirt. Getty Pays $10 Million For Land Near Casa Grande Orebody. No. 541, July 1984, Pp. 21a-22a.

  • 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.

  • Geology

    The Porter GeoConsultancy webpage for Santa Cruz contains a description of the geology. Accessed on 9/29/2010.
    http://www.portergeo.com.au/

  • Reserve-Resource

    Greeley, 1978, P. 83

  • Reserve-Resource

    Worthington, T., 1996, Asarco advances in situ copper project in Arizona; The Northern Miner, March 11 issue, p. C9.

General comments

Subject category Comment text
Deposit Property Is Also Located In T6s, R4e, Secs. 13 And 24. Mining District Name Is Actually Francisco Grande. It Should Be Noted That This Ore Body Is Probably Contiguous With The Casa Grande Ore Body, With Split Ownership. The Bureau Of Mines Is Currently Doing Research On Santa Cruz.
Deposit The High Grade Of The Ore Body Is Due To A Supergene Enrichment Zone Composed Of Atacmite And Chrysocolla In The Oxide Zone.

Reporter information

Type Date Name Affiliation Comment
Reporter 02-OCT-91 Intermountain Field Operations Center (IFOC) U.S. Bureau of Mines
Reporter 01-APR-83 Peterson, Jocelyn A. U.S. Geological Survey
Updater 01-MAR-94 Orris, Greta J. U.S. Geological Survey
Reporter 20-SEP-96 Smith / Jrs U.S. Bureau of Mines
Updater 02-SEP-09 Anderson, Claire U.S. Geological Survey
Editor 29-SEP-10 Schruben, Paul U.S. Geological Survey Added reserves

Beyond USGS

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

Operator history (post-MRDS)

MRDS records operators as of each record's last update (≤ 2019). Some of the operators listed here have since changed hands or dissolved:

  • Asarco (American Smelting And Refining Co.) — acquired by Asarco LLC, subsidiary of Grupo México (2009)
    American Smelting and Refining Co. Filed Chapter 11 in 2005; acquired out of bankruptcy by Grupo México in 2009.

Curated by qvyshift.com from publicly-reported M&A activity (SEC filings, press releases, USGS Mineral Yearbooks). Not authoritative — verify against primary sources before relying on it. The MSHA panel above is the current authoritative source for actively-permitted mines.

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.