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Cumobabi

Producer in Sonora, Mexico with commodities Molybdenum, Copper, Zinc, Lead, Silver, Tungsten
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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. Geologic structures
  12. Ore body information
  13. Economic information about the deposit and operations
  14. Mining district
  15. Ownership information
  16. Reserves and resources
  17. Links to other databases
  18. Bibliographic references
  19. General comments
  20. Reporter information

Geologic information

Identification information

Deposit ID 10106943
MRDS ID MX00346
Record type Site
Current site name Cumobabi
Alternate or previous names Transvaal, San Judas, El Molibdeno, La Verde, Transvaal West
Related records 10206015

Geographic coordinates

Geographic coordinates: -109.97147, 29.87241 (WGS84)
Relative position 10 KM N OF CUMPAS.

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

Commodities

Commodity Importance
Molybdenum Primary
Copper Primary
Zinc Critical Tertiary
Lead Tertiary
Silver Tertiary
Tungsten Critical Tertiary

Comments on the commodity information

  • PRESENCE OF AG IS UNCERTAIN.

Materials information

Materials Type of material
Bornite Ore
Chalcopyrite Ore
Galena Ore
Molybdenite Ore
Sphalerite Ore
Tetrahedrite Ore
Wolframite Ore
Anhydrite Gangue
Apatite Gangue
Biotite Gangue
Calcite Gangue
Ilmenite Gangue
Magnetite Gangue
Quartz Gangue
Sericite Gangue
Siderite Gangue
Tourmaline Gangue
Pyrite Unknown

Alteration

  • (Local) Potassic, Propylitic, Sericitic, Argillic, Phyllic; Tourmalinization

Analytical data

Result AVG. GRADE: 0.20% MO, 0.25% CU, (SCHERKENBACH, ET.AL., 1985)

Mineral occurrence model information

Model code 79
USGS model code 21a
Deposit model name Porphyry Cu-Mo
Mark3 model number 2

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Granitoid > Quartz Monzonite
    Stratigraphic age (youngest) Paleocene
  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
  • Host or associated Associated
    Rock type Plutonic Rock > Granitoid > Granite
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Pyroclastic Rock > Tuff
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Rhyolite
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Dacite
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Intermediate Volcanic Rock > Andesite

Nearby scientific data

(1) -109.97147, 29.87241
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description At Least 6 Major Normal Faults, Generally N-S, Subordinate E-W Trend, Displacements From Essentially Nil To 100 M.
Type of structure Local
Structure description Structural Trends: N 10 W And N 50 W.

Ore body information

  • General form COLLAPSE BRECCIA

Comments on the geologic information

  • COUNTRY ROCK: (TERTIARY?) SEQUENCE OF CALC-ALKALINE ANDESITE FLOWS, A200 M THICK, OVERLAIN BY DACITIC-ANDESITIC F. GR. VOLCANICS AND PORPHYRITIC QUARTZ-RICH RHYOLITE FLOWS; IN TURN OVERLAIN BY UP TO 200 M SECTION OF INTERMEDIATE PYROCLASTIC ROCKS, INCLUDING AT LEAST TWO TUFF UNITS AND RARE ANDESITE FLOWS. ESSENTIALLY UNDEFORMED SEQUENCE DIPS 5-10 DEGREES W. INTRUSIVES: 1> QUARTZ MONZONITE PORPHYRY (K-AR, BIO, 63.1 +/- 1.7 M.Y.), COMMONLY PHYLLICALLY ALTERED, INTRUDES ANDESITES AND DACITES; 2> PORPHYRITIC RHYOLITE (POSS. COEVAL WITH RHYOLITE FLOWS); 3> PORPHYRITIC PLAG-BIO-DIORITE (K-AR, BIO, 56.0 +/- 5.1 M.Y.), POTASSICALLY ALTERED, CROPS OUT AS APOPHYSES NEAR VOLCANIC CONTACTS, BRECCIAS AND FAULTS; 4> MICROGRANITE (K-AR, WR, 55.6 +/- 0.3 M.Y.), LOCALLY CONTAINS WELL DEVELOPED STOCKWORK, SERICITICALLY AND PROPYLITICALLY ALTERED.

Economic information about the deposit and operations

Development status Producer
Commodity type Metallic
Deposit size Medium
Significant No
Year of first production 1980

Mining district

District name La Verde/Cumpas

Ownership information

  • Type Owner
    Owner Cia. Minera Comobabi

Comments on the production information

  • INITIAL PROD. CAPACITY: 2000 TPD FROM OPEN PIT ON SAN JUDAS BRECCIA.

Reserves and resources

  • Type In-situ
    Estimate year 1985
    Total resources 24000000mt ore
    Commodity Subtype Grade units Group Importance Year
    Molybdenum Mo 0.5 wt-pct Molybdenum Major 1985
    Copper Cu 0.1 wt-pct Copper Major 1985

Comments on the reserve resource information

  • 1>TRANSVAAL DEPOSIT. 2>SAN JUDAS AND EL MOLIBDENO DEPOSITS. SAN JUDAS RESERVES LISTED IN MOLYBDENUM YEARBOOK (1983): 10 MILLION TONS, 0.2% MO, 0.25% CU.
  • INCLUDES ALL CUMOBABI PROPERTIES.

Comments on the workings information

  • MINED FROM OPEN-PIT ON SAN JUDAS BRECCIA BODY.

Comments on development

  • BECAME MEXICO'S FIRST MAJOR PRODUCING MO MINE IN AUG. 1980.

Reference information

Bibliographic references

  • Deposit

    PEREZ SEGURA, EFREN, 1985, CARTA METALOGENETICA DE SONORA 1:250000 UNA INTERPRETACION DE LA METALOGENIA DE SONORA: UNIV. OF SONORA, DEPT. OF GEOL., HERMOSILLO, MEXICO, 66 P.

  • Deposit

    ROLDAN-QUINTANA, J., 1979, BRIEF SUMMARY OF THE MINERAL DEPOSITS IN THE NORTHERN PART OF THE STATE OF SONORA, MEXICO IN ANDERSON, T.H., AND ROLDAN-QUINTANA, J., (EDS.), 1979, GUIDEBOOK, FIELD TRIP 27; GEOLOGY OF NORTHERN SONORA: U.N.A.M.- UNIV. PITTSBURG, P. 69-73.

  • Deposit

    CENDEJAS F., C., Y BARCENAS R., A., 1978, GEOLOGIA DE LA REGION CUPRIFERA DEL TRANSVAAL, MUNICIPIO DE CUMPAS, SONORA: PRIMERO SIMPOSIO SOBRE LA GEOLOGIA Y POTENCIAL MINERO DEL ESTADO DE SONORA, RESUMENES 1, HERMOSILLO, MEXICO, P. 27-29.

  • Deposit

    SCHERKENBACH, D.A., SAWKINS, F.J., AND SEYFRIED, W.E., JR., 1985, GEOLOGIC, FLUID INCLUSION, AND GEOCHEMICAL STUDIES OF THE MINERALIZED BRECCIAS AT CUMOBABI, SONORA, MEXICO: ECONOMIC GEOLOGY, V. 80, NO. 6, P. 1566-1592.

  • Deposit

    SUTULOV, A., 1983, INTERMET MOLYBDENUM YEARBOOK 1983: SANTIAGO, CHILE, INTERMET PUBLICATIONS, 297 P.

  • Deposit

    SCHERKENBACH, D.A., AND SAWKINS, F.J., 1982, THE MOLYBDENUM DEPOSIT OF CUMOBABI, NORTHERN SONORA, MEXICO: GSA ABSTRACTS WITH PROGRAMS, V. 14, NO. 7, P. 609.

  • Production

    INTERMET MOLYBDENUM YEARBOOK, 1983, P. 77.

General comments

Subject category Comment text
Deposit TABLE IN PEREZ TEXT LISTS RESERVES AS FOLLOWS; MUNICIPALITY: CUMPAS, NAME: CIA. MINERA CUMOBABI, MAINLY SAN JUDAS AND INTERMEDIATE ZONES. AVERAGE GRADE: 0.5% MO, 0.1% CU. RESERVES: 2 TO 4 MILLION TONS. DIMENSIONS OF INDIVIDUAL OREBODIES (SCHERKENBACH, ET.AL., 1985)- SAN JUDAS: BROAD ARC A 500 M ALONG QMP CONTACT, 80 M WIDE, 350 M DEEP; TRANSVAAL AND TRANSVAAL WEST: EACH ABOUT 150 M WIDE, 300 M LONG; LA VERDE: ROUNDED IN PLAN, 90 M DIAMETER, UNKNOWN DEPTH. ; INFO.SRC : 1 PUB
Deposit MO-CU MINERALIZATION LOCALIZED IN PEGMATITIC BRECCIAS AND IN COLLAPSE-TYPE BRECCIAS ALONG BORDERS OF INTRUSIVE. AT LEAST 35 BRECCIA BODIES IN 12 SQ KM AREA. ORE GRADE MINERALIZATION RESTRICTED TO A FEW CENTRALLY LOCATED BODIES AND ASSOCIATED STOCKWORKS. KNOWN MINERALIZED BRECCIAS HAVE IRREGULAR, ELONGATE SHAPES, RANGING FROM A FEW M TO MORE THAN 300 M IN LONGEST HORIZONTAL DIMENSION. DEPTHS TO MORE THAN 400 M. BODIES PINCH AND SWELL VERTICALLY. BRECCIAS HAVE DIVERSE CHARACTERISTICS - IN CLAST SIZE, ANGULARITY, DEGREE OF BRECCIATION, GRADATIONAL VS. ABRUPT CONTACTS, ETC. BRECCIAS COINCIDE WITH FINGERLIKE PROJECTIONS OF POTASSIC ALTERATION WITHIN LARGE PROPYLITIC ZONE. CROSSCUT BY DOMINANTLY FRACTURE CONTROLLED ZONES OF SERICITIC ALTERATION WITH POCKETS OF ARGILLIC ALTERATION. DISTAL, UNMINERALIZED BRECCIAS EXHIBIT STRONG SERICITIZATION AND TOURMALINIZATION. TWO STAGES OF POST-BRECCIATION ALTERATION AND MINERALIZATION: 1> POTASSIC ALTERATION AND DEPOSITION OF MOLYBDENITE-PYRITE-QUARTZ
Deposit ASSEMBLAGE; 2> QUARTZ-SERICITE ALTERATION AND REPLACEMENT OF PYRITE BY CHALCOPYRITE + TETRAHEDRITE.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-NOV-1987 Leonard, Kenneth R. (Page, Norman J.) U.S. Geological Survey
Updater 01-JUN-1988 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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