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Cerro Negros

Past Producer in Chihuahua, Mexico with commodity Manganese
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Mineral occurrence model information
  7. Host and associated rocks
  8. Nearby scientific data
  9. Economic information about the deposit and operations
  10. Mining district
  11. Links to other databases
  12. Bibliographic references
  13. General comments
  14. Reporter information

Geologic information

Identification information

Deposit ID 10049598
MRDS ID MX02362
Record type Site
Current site name Cerro Negros
Related records 10278978

Geographic coordinates

Geographic coordinates: -106.36721, 28.40025 (WGS84)
Location accuracy 10000(meters)
Relative position 20 KM ENE OF EL AGUAJE

Site location context

Political divisions (FIPS codes)

Pima(county)

Arizona(state)

United States(country)

North America(continent)

Land(continent)

Geographic areas

Country State
Mexico Chihuahua

Comments on the location information

  • 25 KM S OF LA CUESTA. 5 KM E OF LA CUESTA-CUARTOCIENEGAS HWY. THE DEPOSITS ARE AT THE SOUTHERN END OF THE SIERRA DE LA ENCANTADA, 120 KM N65W OF THE CITY OF MUSQUIZ, COAHUILA.
  • CERROS NEGROS ARE THE DARK BASALT CAPPED HILLS IN THE VOLCANIC CAPPING BASALT THAT OVERLAY THE TERTIARY FELSIC VOLCANICS THAT HOST THE MN OCCURRENCE. PROSPECT AREA IS 35 KM SW OF CHIHUAHUA CITY IN THE SOUTHERN SIERRA DEL TAMBOR.

Commodities

Commodity Importance
Manganese Critical Primary

Comments on the commodity information

  • AG-PB ORES ARE OXIDIZED AND SUPERGENE-ENRICHED EXAMPLES OF CARBONATE-HOSTED, HIGH-T (200-400C) MASSIVE SULFIDE (60% SULFIDES) ORES RESULTING FROM BOTH REPLACEMENT AND OPEN-SPACE FILLING.

Mineral occurrence model information

Model code 156
USGS model code 25g
Deposit model name Epithermal Mn

Host and associated rocks

  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic)
    Stratigraphic age (youngest) Pliocene
    Stratigraphic age (youngest) Pliocene
  • Host or associated Associated
    Rock type Plutonic Rock
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic)
  • Host or associated Host
    Rock type Plutonic Rock

Nearby scientific data

(1) -106.36721, 28.40025
ListMap

Economic information

Comments on the geologic information

  • THE ENCANTADA DEPOSITS LIE IN THE COAHUILA COMPOSITE TECTONO-STRATIGRAPHIC TERRANE WHICH IS CONSIDERED A PALEOZOIC ACCRETED TERRANE COMPOSED OF METAMORPHOSED ROCKS OVERLAIN BY A MESOZOIC CARBONATE OVERLAP ASSEMBLAGE. THE OLDEST ROCKS KNOWN IN THE REGION ARE PALEOZOIC METAMORPHIC ROCKS THAT CROP OUT 100 KM NORTHWEST AND APPROXIMATELY 100 KM SOUTH OF LA ENCANTADA IN SIERRA DEL CARMEN AND SIERRA DEL FUSTE, RESPECTIVELY. UNCONFORMABLY OVERLAYING THE PALEOZOIC ROCKS IS A THICK SEQUENCE OF MESOZOIC CARBONATE ROCKS, PART OF THE MARINE TRANSGRESSION RELATED TO THE OPENING OF THE GULF OF MEXICO AND LATE CENOMANIAN-MAESTRICHTIAN TERRIGENOUS SEDIMENTS WITH MINOR CARBONATE DEPOSITS PROBABLY RELATED TO THE BEGINNING OF THE LARAMIDE OROGENY IN MEXICO. PHYSIOGRAPHICALLY, LA ENCANTADA LIES ON THE COAHUILA PROVINCE, AN AREA CONSIDERED TO BE AN EXTENSION OF THE BASIN AND RANGE PROVINCE. TECTONICALLY, IT LIES ON THE BOUNDARY BETWEEN THE JURASSIC COAHUILA PENINSULA AND THE SABINAS BASIN. SLIGHTLY FOLDED,
  • FAULTED AND LOCALLY THRUSTED CRETACEOUS (APTIAN-CENOMANIAN) CARBONATE AND PELITIC ROCKS INTRUDED BY DIORITIC TO GRANODIORITIC DIKES AND A 27 MA OLD GRANODIORITIC PLUTON, COMPOSE THE STRATIGRAPHIC SEQUENCE AT LA ENCANTADA. MARBLE, SKARN, AND HORNFELS DERIVED FROM THE CARBONATE AND PELITIC ROCKS ARE LOCALLY DISTRIBUTED AROUND BOTH THE GRANODIORITE INTRUSIVE AND HYDROTHERMALLY ALTERED BRECCIA AND FRACTURE ZONES. A 27 MA OLD GRANODIORITE BODY, AND FELSIC TO MAFIC DIKES OF OLIGOCENE AGE INTRUDE THE SEDIMENTARY SEQUENCE AT LA ENCANTADA. THE GRANODIORITE IS OF REGIONAL EXTENT AND APPARENTLY HAS A SEMIHORIZONTAL ATTITUDE. IT CONSISTS OF FELDSPARS, QUARTZ, AND FERROMAGNESIAN MINERALS WITH PYRITE AND EPIDOTE ALONG FRACTURES. THIS INTRUSIVE IS KNOWN IN THE MINE FROM DRILL HOLES AND SHOWS ALTERATION TO SERICITE AND CHLORITE. IT APPEARS TO BE RESOPNSIBLE FOR THE FORMATION OF THE TACTITE DOME AND METAMORPHIC HALO. RHYOLITE-PORPHYRY DIKES CONSIST OF FELDSPARS, QUARTZ, HORNBLENDE AND DISSEMINATED
  • PYRITE.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No

Mining district

District name General Trias District/Chihuahua City Area

Comments on development

  • LA ENCANTADA IS A RECENT DISCOVERY. FIRST FINDINGS BY LOCAL PROSPECTORS WERE ABOUT 1950 FOLLOWED BY DISCOVERIES OF THE GUADALUPE, SAN JOSE, LA ESCONDIDA, AND SAN FRANCISCO ORE BODIES IN 1956 BY COMPANIA MINERA LOS ANGELES. LA PERLA ORE BODY WAS FOUND IN 1963. ; ECON.COM: IN 1973 A MAGNETIC SEPARATION PLANT WAS INSTALLED AND IN 1978 A 1200 T/D FLOTATION PLANT WAS BROUGHT ON LINE.

Reference information

Bibliographic references

  • Deposit

    SOCIEDAD GEOLOGICA MEXICANA A.C., 1985, PLANO GEOLOGICO MINERO DE CHIHUAHUA, MEXICO: CONSEJO DE RECURSOS MINERALES AND FEDERAL GOVERNMENT OF MEXICO, MEXICO D.F., 1 SHEET, SCALE 1:500,000.

  • Deposit

    SECRETARIO DE PROGRAMACION Y PREPUESTO, 1985, CHIHUAHUA: CARTA GEOLOGICA; INSTITUTO NACIONAL DE ESTADISTICA GEOGRAFIA E INFORMACION, MEXICO D.F., SCALE 1:250,000.

  • Other Database

    CIMRI

General comments

Subject category Comment text
Deposit MINERALIZATION AT LA ENCANTADA IS DEVELOPED WITHIN CRETACEOUS CARBONATE ROCKS OF THE AURORA FORMATION ADJACENT TO A GRANODIORITIC PLUTON. THE DEPOSITS ARE A TYPICAL EXAMPLE OF A ZONED (SKARN/MANTOS/CHIMNEYS/VEINS) INTRUSION-CENTERED, CARBONATE-HOSTED, HIGH-TEMPERATURE SILVER-LEAD MASSIVE-SULFIDES SYSTEM, WITH DEEP OXIDATION AND SUPERGENE ENRICHMENT. THE DEPOSITS SHOW THREE VERTICAL ZONES WITH A DEEP ZONE OF SKARN AND CONTACT OREBODIES COMPOSED OF SILICATES, OXIDE AND SULFIDE MINERALIZATION, AN INTERMEDIATE ZONE OF MANTOS AND CHIMNEYS COMPOSED OF OXIDE, CARBONATE AND RELICT SULFIDE MINERALIZATION WITH BOTH REPLACEMENT AND FILLING TEXTURES, AND AN UPPER ZONE OF MANTOS AND VEINS FORMED MAINLY BY OPEN-SPACE FILLING. NORTHEAST AND NORTHWEST-TRENDING FAULTS AND FRACTURES PREDATE THE MINERALIZATION AND WERE IMPORTANT CONTROLS ON THE MINERALIZATION. A TACTITE DOME, COMPOSED OF CALC-SILICATES AND RICH IN FLUORITE, DEVELOPED ALONG THE GRANODIORITE/LIMESTONE CONTACT CONTROLS THE DISTRIBUTION
Deposit THE ORE BODIES ARE PART OF AN INTRUSION-CENTERED SYSTEM WITH CRUDE ALTERATION ZONING AND A WIDE SPECTRUM OF MINERALIZATION TEXTURES, VARYING FROM REPLACEMENT AT DEPTH TO OPEN-SPACE FILLING TEXTURES UPWARD AND AWAY FROM THE INTRUSIVE CENTER. ORES ZONING CONSISTS OF SKARN AND CONTACT BODIES WHICH LIE ALONG THE TACTITE MARGINS AT DEPTH AND GRADE UPWARDS TO MANTOS AND CHIMNEYS. VEINS DOMINATE AT THE HIGHEST LEVELS ALONG THE SAME STRUCTURAL TRENDS THAT HOST THE MANTOS AND CHIMNEYS. ALL OF THE ORES ARE OXIDIZED AND SUPERGENICALLY ENRICHED BODIES PROBABLY RESULTING FROM DEEP OXIDATION OF IRON, LEAD, ZINC AND SILVER SULFIDES AND SULFOSALTS. MANTOS AND CHIMENYS ARE MASSIVE OXIDIZED BODIES HIGH IN IRON OXIDES PRESUMABLY DERIVED FROM THE OXIDATION OF PYRITE OF PYRRHOTITE. CHIMNEYS HAVE A HIGH-GRADE CORE SURROUNDED BY A HEMATITIC HALO LOW IN SILVER-LEAD VALUES. MINERALIZATION ALSO OCCURS AS FISSURE-FILLING VEINS IN THE UPPER PART OF THE CARBONATE SECTION.
Deposit OF SKARN ORE BODIES. ALTHOUGH A LITHOLOGICAL CONTROL IS NOT WELL ESTABLISHED, THE ORE TENDS TO BE CONCENTRATED WITHIN THE BASE OF THE AURORA FORMATION IN FRACTURES AND RELATIVELY POROUS MICRITIC LIMESTONES. THE MINERALOGY CONSISTS OF A COMPLEX ASSEMBLAGE OF OXIDIZED SULFIDES OF IRON, SILVER, LEAD AND ZINC. WALL ROCK ALTERATION CONSISTS OF MARMORIZATION, BLEACHING AND LOCAL SILICIFICATION; CALC-SILICATE ALTERATION IS RESTRICTED TO THE TACTITE AND GRADES OUTWARD FROM GARNETS-DIOPSIDE TO CHLORITE-EPIDOTE. VERTICAL ZONING OF OREBODY TYPES, WALL ROCK ALTERATION, SKARN MINERALOGY AND THE PRESUMED ORIGINAL SULFIDES SHOW GENERAL SIMILARITIES TO THE NAICA DEPOSIT. ORE GRADES AT LA ENCANTADA AVERAGE 646 G/T OF SILVER AND 23.5% LEAD IN CHIMENYS AND 418 G/T SILVER AND 5.8% LEAD IN SKARN, WHICH ARE COMPARABLE TO OXIDE GRADES PRODUCED IN THE PAST AT NAICA AND SANTA EULALIA. ; INFO.SRC : 1 PUB LIT
Deposit MINE NOT SHOWN ON CHIHUAHUA 1:250,000 GEOLOGIC MAP. ; INFO.SRC : 1 PUB LIT

Reporter information

Type Date Name Affiliation Comment
Reporter 01-APR-91 Staude, John-Mark G. U.S. Geological Survey

Beyond USGS

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

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