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Santa Gertrudis

Producer in Sonora, Mexico with commodity Gold
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Materials information
  7. Alteration
  8. Mineral occurrence model information
  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. Production statistics
  16. Links to other databases
  17. Bibliographic references
  18. General comments
  19. Reporter information

Geologic information

Identification information

Deposit ID 10049063
MRDS ID MX00279
Record type Site
Current site name Santa Gertrudis
Related records 10239744

Geographic coordinates

Geographic coordinates: -110.54233, 30.62238 (WGS84)
Location accuracy 2000(meters)
Relative position ABOUT 60 KM E OF MAGDALENA., Accurate To Approx. 2 Km, Lat-Long Correspond To Location Of Mine Office.

Site location context

Political divisions (FIPS codes)

Pima(county)

Arizona(state)

United States(country)

North America(continent)

Land(continent)

Geographic areas

Country State
Mexico Sonora

Comments on the location information

  • ROAD ACCESS TO MINE FROM MAGDELENA, SONORA. MINING DISTRICT IS MADE UP OF AT LEAST 13 SEPARATE ORE BODIES OVER A MINIUM OF 10 SQUARE KILOMETERS.

Commodities

Commodity Importance
Gold Primary

Materials information

Materials Type of material
Gold Ore
Fluorite Gangue
Hematite Gangue
Jarosite Gangue
Limonite Gangue
Mimetite Gangue
Quartz Gangue

Alteration

  • (Local) Oxidation, Silicification

Mineral occurrence model information

Model code 172
USGS model code 26a
Deposit model name Carbonate-hosted Au-Ag
Mark3 model number 15

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite > Diabase
    Stratigraphic age (youngest) Late Cretaceous
    Stratigraphic age (youngest) Pliocene
  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Siltstone
  • Host or associated Host
    Rock type Sedimentary Rock > Carbonate > Limestone

Nearby scientific data

(1) -110.54233, 30.62238
ListMap

Economic information

Ore body information

  • General form STRATABOUND-STRATAFORM (LARGELY)

Controls for ore emplacement

  • Strong Hydrothermal Activity, Intense Brecciation And Mineralization Occur Where Contact Between Two Carbonate Units Has Been Disrupted By Steep Cross-Faults.

Comments on the geologic information

  • AU OCCURS REGIONALLY IN A CALCAREOUS SANDSTONE UNIT UNDERLYING A MASSIVE, BLACK, SILTY CARBONACEOUS LIMESTONE UNIT. AREA IS COMPLEX STRUCTURALLY, WITH OVERTURNRD FOLDS IN THE CARBONATES AND SEVERAL PERIODS OF DEFORMATION. CARBONATE SEQUENCE OVERLAIN BY IGNIMBRITES. (SILBERMAN, 1987)

Economic information about the deposit and operations

Development status Producer
Commodity type Metallic
Deposit size Medium
Significant No
Discovery year 1982
Discoverer Phelps Dodge Exploration
Year of first production 1991
Production years 1991-

Mining district

District name Santa Gertrudis

Production statistics

  • Year 1987
    Material ORE AU
    Accuracy Estimate
    Description Ap_Grade: ^5.0 G/Mt Au
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Ore Gold Gold 5g/mt

Comments on the production information

  • LOW YIELD DUE TO PROBLEMS WITH CRUSHING ORE FINE ENOUGH FOR EFFICIENT RECOVERY FROM LEACH PADS.

Comments on the workings information

  • OPEN PIT AU MINE, AT LEAST 13 SEPARATE BODIES INDIVIDUALLY AVERAGING 30,000 OUNCES AU AND UP TO 100,000 OUNCES ESTIMATED.

Comments on development

  • EXPLORATION AND PRODUCTION UNDERWAY, 1987.

Reference information

Bibliographic references

  • Deposit

    STAUDE, J.M., COX, D.P., AND SILBERMAN, M.L., PERSONAL VISIT, 1987.

  • Deposit

    SILBERMAN, M.L., 1987, REPORT ON RECONNAISSANCE OF GOLD PROSPECTS IN NORTHERN SONORA, MEXICO: UNPUB. USGS REPORT, 6 P.

  • Production

    MINE OWNER.

General comments

Subject category Comment text
Deposit DISSEMINATED GOLD IN JASPEROID AND SILICIFIED BRECCIATED LIMESTONE. ZONES OF HIGH GRADE MINERALIZATION CHARACTERIZED BY STRONG BRECCIATION, SILICIFICATION AND OXIDATION. QUARTZ-HEMATITE HYDROTHERMAL BRECCIAS COMMON.
Deposit SMALL HEAP LEACHING OPERATION ACTIVE IN 1987 PROCESSED 2000 MT GRADING 2-5 G/MT EVERY TWO WEEKS. ; INFO.SRC : 1 PUB
Deposit Discovery Year: EARLY 1980'S

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUL-87 Staude, John-Mark G. (Page, Norman J.) U.S. Geological Survey
Updater 01-JUN-88 Leonard, Kenneth R. U.S. Geological Survey

Beyond USGS

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

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