El Nublado

Occurrence in Sonora, Mexico with commodities Tungsten, Molybdenum, Copper

Sections on this page

Identification information
Geographic coordinates
Site location context
Geographic areas
Commodities
Materials information
Mineral occurrence model information
Host and associated rocks
Nearby scientific data
Economic information about the deposit and operations
Mining district
Reserves and resources
Links to other databases
Bibliographic references
General comments
Reporter information

Geologic information

Identification information

Deposit ID	10095816
MRDS ID	MX00268
Record type	Site
Current site name	El Nublado
Related records	10133355

Geographic coordinates

Geographic coordinates:	-110.74372, 29.22521 (WGS84)
Relative position	E SIDE OF EL PICACHO, AN ISOLATED PEAK ABOUT 25 KM NE OF HERMOSILLO AND 4 KM N OF POZO DE TOYES.

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
Molybdenum	Secondary
Copper	Tertiary

Materials information

Materials	Type of material
Powellite	Ore
Scheelite	Ore
Epidote	Gangue
Garnet	Gangue

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

Host or associated	Host
Rock type	Sedimentary Rock > Carbonate > Limestone

Nearby scientific data

(1)	-110.74372, 29.22521	ListMap

Economic information

Comments on the geologic information

PROSPECT IS IN A NW STRIKING BELT OF DISCONTINUOUS TACTITE OUTCROPS SURROUNDED BY METAMORPHOSED LIMESTONE AND HORNFELS. LIMESTONE PROBABLY UNDERLAIN BY GRANITE. GRANITE OUTCROP 200 M W OF THE LIMESTONE IS SEPARATED FROM IT BY AN AREA OF SILICIFIED VOLCANIC BRECCIA WHICH IS IN CONTACT WITH THE LIMESTONE ALONG A PRE-INTRUSIVE FAULT.

Economic information about the deposit and operations

Development status	Occurrence
Commodity type	Metallic
Deposit size	Small
Significant	No
Discovery year	1943

Mining district

District name	Picacho

Reserves and resources

Type In-situ

Estimate year 1945

Commodity Subtype Grade units Group Importance Year

Tungsten Wo3 1 wt-pct Tungsten Major 1945

Comments on the reserve resource information

ESTIMATED TO DEPTHS OF 10 M FROM EXPOSURES IN SHALLOW PIT AND AT THE OUTCROPS. TACTITE IS VERY HARD AND DENSE, DIFFICULT TO WORK BY HAND METHODS.

Comments on the workings information

ONE SHALLOW PIT.

Comments on development

TUNGSTEN-BEARING TACTITE DISCOVERED IN DISTRICT IN 1943. THREE CLAIMS RECORDED: EL NUBLADO, EL PICACHO, AND LA FLORENCIA. ONLY A LITTLE WORK WAS DONE IN 1943, AND NO W ORE WAS MINED. IN MORE RECENT YEARS EL PICACHO AND LA FLORENCIA WERE PUT INTO GOLD PRODUCTION.

Reference information

Links to other databases

Agency	Database name	Acronym	Record ID	Notes
USGS	Mineral Resources Data System	MRDS	MX00268

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	NO PRODUCTION BUT APPEARS TO BE AN AREA WORTHY OF FURTHER INVESTIGATION. ; INFO.SRC : 1 PUB
Deposit	EPIDOTE-GARNET TACTITE WITH SMALL AMOUNTS OF SCHEELITE, POWELLITE, AND OX. CU MINERALS. ONLY TWO LENSES OF TACTITE CONTAINED ENOUGH SCHEELITE TO BE CONSIDERED ORE.

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.