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Dolores

Past Producer in Chihuahua, Mexico with commodities Gold, Silver, Lead, Copper
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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. Economic information about the deposit and operations
  13. Mining district
  14. Production statistics
  15. Workings at the site
  16. Links to other databases
  17. Bibliographic references
  18. General comments
  19. Reporter information

Geologic information

Identification information

Deposit ID 10049505
MRDS ID MX02230
Record type Site
Current site name Dolores
Alternate or previous names Mines: San Francisco, Alma De Maria
Related records 10182548

Geographic coordinates

Geographic coordinates: -108.51949, 28.98494 (WGS84)
Location accuracy 2000(meters)
Relative position 7 KM S OF EL MEZQUITE (AU, AG)

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

  • MINES NOT SHOWN ON 1:50,000 TOPOGRAPHIC QUAD. BUT DISTRICT IS. 50 KM WSW OF MADERA CITY.

Commodities

Commodity Importance
Gold Primary
Silver Primary
Lead Secondary
Copper Secondary

Comments on the commodity information

  • A2% SULFIDES. AU:AG (1:55) GONZALEY REYNA, 1956

Materials information

Materials Type of material
Chalcopyrite Ore
Galena Ore
Gold Ore
Sphalerite Ore

Alteration

  • (Local) Silicic, Propylitic

Analytical data

Result AVG. GRADE: 78.68 G/TON AU, 3,360 G/TON AG, (GONZALEZ, 1956). PRODUCTION GRADE: 9.2 G/T AU, 483.0 G/T AG, (MOSIER, ET.AL., 1986)

Mineral occurrence model information

Model code 150
USGS model code 25c
Deposit model name Epithermal vein, Comstock
Mark3 model number 16

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite > Diabase
    Stratigraphic age (youngest) Late Cretaceous
  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Rhyolite
  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Dacite
  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Intermediate Volcanic Rock > Andesite
  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Mafic Volcanic Rock > Basalt
  • Host or associated Host
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite > Diabase
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Rhyolite
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Intermediate Volcanic Rock > Andesite

Nearby scientific data

(1) -108.51949, 28.98494
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description Large, Possibly East Dipping Normal Fault Cuts Through Area

Comments on the geologic information

  • TERRANE MAINLY COMPOSED OF ANDESITES OVERLAIN BY RHYOLITIC FLOWS. CHLORITIC SCHISTS (NE FOLIATION TREND) LOCALLY. IN PLACES, FRACTURED AND MINERALIZED DIABASE APPEARS BELOW RHYOLITE, BUT GENERALLY IT FORMS A CAP 140 M THICK ABOVE RHYOLITIC FLOWS. DACITES FORM DIKES AND FLOWS OVERLYING PRE-EXISTING RHYOLITES AND CONGLOMERATES. BASALT FLOWS ABOVE RHYOLITE TUFFS COMPRISE THE YOUNGEST EXTRUSIVES IN THE AREA. UPPERMOST CONGLOMERATE AND SANDSTONE OF RHYOLITIC ORIGIN SHOW INITIAL DIPS OF 2-3 DEGREES TOWARDS THE EAST, REFLECTING THE ANCIENT TOPOGRAPHY. GEOLOGY ON 1:500,000 AND TECONPA 1:250,000 MAPS DIFFERS SIGNIFICANTLY.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1860

Mining district

District name /Madera

Production statistics

  • Year 1930
    Period 1929-1930
    Material AG
    Accuracy Accurate
    Description Cp_Grade: ^9.2 G/T Au, 483.0 G/T Ag, 0.15% Cu, 0.1% Pb
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Minor Copper Copper 0wt-pct
    Major Lead Lead 0wt-pct
    Major Silver Silver 483g/mt
    Gold Gold 9g/mt

Comments on the production information

  • ITEMS 1 AND 2: PRODUCED FROM 368,386 TONS OF ORE. ITEMS 3-6: PRODUCED FROM 4,992 TONS OF ORE. 5.5X10 TO THE 6 OZ AG AND 0.10X10 TO THE 6 OZ AU THUS AU:AG RATIO 1:55

Workings at the site

  • Type of workings Underground
    Overall depth 182.88M

Comments on the workings information

  • TUNNELS, SHAFTS AND DRIFTS.

Comments on development

  • PLACER GOLD DISC. 1860, FOLLOWED BY SMALL GOLD RUSH (>1000 GAMBUSINOS). SYSTEMATIC DEVELOPMENT BEGAN IN 1898.

Reference information

Bibliographic references

  • Deposit

    GONZALEZ R., J., 1956, MEMORIA GEOLOGICO-MINERA DEL ESTADO DE CHIHUAHUA: XX CONGRESO GEOLOGICO INTERNACIONAL, DURANGO, MEXICO, 1956, P. 52-57.

  • Deposit

    SKINNER, E.N., AND PLATE, H.R., 1915, MINING COSTS OF THE WORLD: NEW YORK, N.Y., MCGRAW-HILL BOOK CO., INC., P. 193.

  • Deposit

    COX, D.P., AND SINGER, D.A., 1986, MINERAL DEPOSIT MODELS: USGS BULLETIN 1693, 379 P.

  • Deposit

    MOSIER, D.L., MENZIE, W.D., AND KLEINHAMPL, F.J., 1986, GEOLOGIC AND GRADE-TONNAGE INFORMATION ON TERTIARY EPITHERMAL PRECIOUS- AND BASE-METAL VEIN DISTRICTS ASSOCIATED WITH VOLCANIC ROCKS: USGS BULLETIN 1666, 39 P.

  • Deposit

    WISSER, E., 1966, THE EPITHERMAL PRECIOUS-METAL PROVINCE OF NORTHWEST MEXICO: NEVADA BUREAU OF MINES REPORT 13, PART C, P. 63-92.

  • 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, 1984, CHABACAN TOPOGRAPHIC QUADRANGLE, INSTITUTO NACIONAL DE ESTADISTICA GEOGRAFIA E INFORMACION, MEXICO D.F., SCALE 1:50,000.

  • Deposit

    SECRETARIO DE PROGRAMACION Y PREPUESTO, 1984, TECORIPA: CARTA GEOLOGICA; INSTITUTO NACIONAL DE ESTADISTICA GEOGRAFIA E INFORMACION, MEXICO D.F., SCALE 1:250,000.

  • Deposit

    GONZALEZ, R.J., 1956A MEMORIA GEOLOGICAL-MINERO

  • Deposit

    FARISH, J.B., 1907, THE DOLORES MINE

  • Deposit

    WISSER, E., 1966, THE EPITHERMAL PRECIOUS-METAL PROVINCE

  • Production

    SKINNER AND PLATE, 1915; GONZALEZ, 1956; MOSIER, ET.AL., 1986 (ITEM 7).

General comments

Subject category Comment text
Deposit EARLY MINE HISTORY: (A1898) TUNNEL DRIVEN N FROM SAN FRANCISCO LODE WITHOUT DIFFICULTY UNTIL 15 M FROM INTERSECTION WITH ALMA DE MARIA VEIN, WHERE ROCK BECAME SO HARD THAT TWO SHIFTS COULD PROGRESS ONLY 12 CM/DAY. THE INTERSECTION PROVED TO BE A BONANZA, PRODUCING $750/TON FROM A 12-30 CM BAND OF ORE ALONG HANGING WALL OF THE VEIN. 1/3 OF THE VALUE WAS IN AU, THE REST IN AG. ; INFO.SRC : 1 PUB
Deposit SAME AS MX02974
Deposit GOLD VEINS AND PLACERS. SILICIFIED VEINS 6-8 M WIDE IN DIABASE DIKES. ZONE OF SILICIC AND PROPYLITIC ALTERATION FORMS A BAND 25 M ON EACH SIDE OF VEIN DEPOSITS, OBSCURING THE BOUNDARY BETWEEN VEINS AND WALL ROCK. ALTERATION MARKED BY FE-OXIDES AT SURFACE. VEINS TREND NNW, OVER 1600 M LONG, 122 M DEEP. OXIDIZED TO 61-122 M DEPTH. LOCATED NEXT TO, AND PERHAPS ON, MAJOR 25 KM NW TRENDING LINAMENT, POSSIBLY A FAULT.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAR-88 Leonard, Kenneth R. (Page, Norman J.) U.S. Geological Survey
Updater 01-JUN-88 Leonard, Kenneth R. U.S. Geological Survey
Updater 01-AUG-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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