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Maria Luisa

Past Producer in Sonora, Mexico with commodity 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. Economic information about the deposit and operations
  12. Mining district
  13. Reserves and resources
  14. Workings at the site
  15. Links to other databases
  16. Bibliographic references
  17. General comments
  18. Reporter information

Geologic information

Identification information

Deposit ID 10104178
MRDS ID MX00245
Record type Site
Current site name Maria Luisa
Related records 10206332

Geographic coordinates

Geographic coordinates: -110.93483, 29.07743 (WGS84)
Relative position 0.7 KM S OF MARAVILLA ON THE EASTERN EDGE OF HILL ALONG LIMESTONE/GRANITE CONTACT.

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

  • ESTIMATE TO WITHIN 1 KM

Commodities

Commodity Importance
Tungsten Critical Primary

Materials information

Materials Type of material
Scheelite Ore
Calcite Gangue
Epidote Gangue
Garnet Gangue
Iron Gangue
Pyrite Gangue
Quartz Gangue

Alteration

  • (Local) Oxidation

Analytical data

Result 3.0 - 6.0% WO3

Mineral occurrence model information

Model code 42
USGS model code 14a
Deposit model name W skarn

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Granitoid > Granite
    Stratigraphic age (youngest) Late Permian
    Stratigraphic age (youngest) Late Cretaceous
  • Host or associated Host
    Rock type Sedimentary Rock > Carbonate > Limestone

Nearby scientific data

(1) -110.93483, 29.07743
ListMap

Economic information

Comments on the geologic information

  • THE HOST GRANITE CONTAINS DIABASE DIKES. THESE ROCKS ARE UNCONFORMABLY OVERLAIN BY A LIMESTONE CONGLOMERATE, AND BY INTERBEDED RHYOLITIC VOLCANICS AND CONGLOMERATES. FAULTING AND REGIONAL NORTHWARD TILTING PRECEDED MINERALIZATION.

Economic information about the deposit and operations

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

Mining district

District name Hermosillo/Cerro Tecoripa

Reserves and resources

  • Type In-situ
    Estimate year 1945
    Commodity Subtype Grade units Group Importance Year
    Tungsten Wo3 3 wt-pct Tungsten Major 1945
  • Type In-situ
    Estimate year 1945
    Commodity Subtype Grade units Group Importance Year
    Tungsten Wo3 1.5 wt-pct Tungsten Major 1945

Comments on the reserve resource information

  • LINE 1: INDICATED ORE ABOVE 30-METER LEVEL IN TACTITE BODIES AT S END OF CLAIM. LINE 2: INFERRED ORE AT N END OF CLAIM HAVING A DEPTH OF FROM 5-10 M.

Workings at the site

  • Type of workings Surface/Underground
    Overall depth 30M

Comments on the workings information

  • 4 SHAFTS SUNK TO 15-30 M DEPTH, SOME STOPING. IN 1943, SMALL MILL ERECTED WHICH HAD A CAPACITY OF ABOUT 3 TPD. MILL CONSISTED OF TWO SMALL BALL MILLS, A SCREEN (1 CM MESH) AND A CONCENTRATING TABLE. PRODUCT CONTAINING 20% WO3 WAS OBTAINED.
  • THE THREE LARGEST MINES ARE PORVENIR, THE FARO AND THE FOCO. PORVENIR WAS CLOSED IN 1938 DUE TO LACK OF ORE. ITS MINERALIZATION PROBABLY FOLLOWED THE FOOTWALL OF A FAULT STRIKING N 50 E, AND DIPPING 50 SE, AT ITS JUNCTION WITH SOME OTHER VERTICAL STRUCTURE. FARO AND FOCO ARE INTERCINNECTED GOPHERINGS EXTENDING DOWN THE N-DIPPING UNCONFORMITY. ORE WAS UNDER DIABASE DIKES JUST BENEATH THE UNCONFORMITY. SOME ORE WAS DISSEMINATED IN THE CONGLOMERATE OR IN ALTERED, FRACTURED PORTIONS OF THE GRANITE.

Reference information

Bibliographic references

  • Deposit

    WIESE, JOHN H., AND CARDENAS, SALVADOR, 1945, TUNGSTEN DEPOSITS OF THE SOUTHERN PART OF SONORA, MEXICO: USGS BULL 946, P. 103-130

General comments

Subject category Comment text
Deposit AT LEAST 15 SCHEELITE-BEARING TACTITE LENSES ALONG IGNEOUS/CARBONATE CONTACT. ONLY LENS AT S END OF CLAIM WAS WORKED. THREE LARGEST ORE BODIES ARRANGED EN ECHELON ALONG FAVORABLE BEDS IN LIMESTONE. N ORE BODY CUT BY DIABASE DIKE 1-2 M THICK INTRUDED ALONG A FAULT OF 2 M HORIZONTAL DISPLACEMENT. ORIGINALLY THE SCHEELITE WAS IN A GANGUE OF QUARTZ, CALCITE, GARNET, EPIDOTE, AND PYRITE. PYRITE OXIDIZED AND CALCITE, GARNET, AND EPIDOTE WEATHERED OUT LEAVING POROUS, PARTLY BRECCIATED ORE COMPOSED OF QUARTZ, SCHEELITE, IRON OXIDE, AND F. GR. BROWN CALCITE. PROBABLE VOLUME DECREASE OF 50% IN THE UPPER PART OF THE ORE BODY. TUNGSTEN CONTENT (WO3) ABOUT 6.0% AT THE SURFACE, DECREASING TO ABOUT 3.0% AT A DEPTH OF 20 M. NO UNOXIDIZED SULFIDES OR SUPERGENE SCHEELITE FOUND.
Deposit DISTRICT IS 2 KM LONG AND 1/2 KM WIDE, TRENDING NW ALONG UNCONFORMITY. SMALL RICH SHOOTS OCCUR WHERE 2 OR MORE LOW GRADE TABULAR BODIES CONTROLLED BY IMPERMEABLE BARRIERS INTERSECT. THE BEST DEPOSITS ARE UNDER THE FOOTWALL SIDES OF DIABASE DIKES, JUST BELOW THE UNCONFORMITY, WHICH IS OVERLAIN BY SILICIFIED CONGLOMERATE. ORE BODIES ARE USUALLY ONLY A FEW METERS LONG, BUT MAY BE GROUPED IN A MINERALIZED ZONE.
Deposit IN 1946, A LARGE TONNAGE OF LOW GRADE ORE WAS SAID TO REMAIN, ESPECIALLY IN THE FOCO MINE. THE MINES WERE DESTROYED BY THE UNMETHODICAL EXPLOITATION WHICH LEFT NO MEANS OF SUPPORT; THEREFORE, REOPENING THEM SEEMS UNFEASIBLE. ; INFO.SRC : 1 PUB LIT

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUL-1987 Staude, John-Mark G. (Page, Norman J.) U.S. Geological Survey
Updater 01-OCT-1987 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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