1. Mineral Resources
  2. Online Spatial Data
  3. Mineral Resource Data System (MRDS)

Silver Reef Mine

Past Producer in Pinal county in Arizona, United States with commodities Silver, Lead, Copper, Gold, Silica, Molybdenum
Map
XML
JSON
KML
B
Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Public Land Survey System information
  6. Commodities
  7. Materials information
  8. Host and associated rocks
  9. Nearby scientific data
  10. Geologic structures
  11. Ore body information
  12. Controls for ore emplacement
  13. Economic information about the deposit and operations
  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 10046277
MRDS ID M241169
Record type Site
Current site name Silver Reef Mine
Alternate or previous names Horn Silver Mine, Hornsilver, Silver Nugget Mine, Nugget Mine, Lead Boulder Mine, Greenhorn Mine, Santiago, Cholla
Related records 10159000

Geographic coordinates

Geographic coordinates: -111.81821, 32.66816 (WGS84)
Elevation 518
Relative position ABOUT 2.5 MILES SOUTHWEST OF WHITE HORSE PASS

Site location context

Political divisions (FIPS codes)

Pinal(county)

Arizona(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Silver Reef Mountains(quadrangle 1:24,000 scale)

Casa Grande(quadrangle 1:100,000 scale)

Tucson(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Santa Rosa Wash(hydrologic unit)

Santa Cruz(hydrologic accounting unit)

Middle Gila(hydrologic subregion)

Lower Colorado(hydrologic region)

Federal lands

BIA(Federal land areas administered by BIA)

Geographic areas

Country State County
United States Arizona Pinal

Public Land Survey System information

Meridian Township Range Section Fraction State
Gila and Salt River 008S 005E 23 S2 OF S2 Arizona

Comments on the location information

  • LOCATED ON THE NORTH SLOPE OF THE SILVER REEF MOUNTAINS; CLAIMS EXTEND SLIGHTLY INTO SECTIONS 26 AND 24; UTM GIVEN IS FOR THE HORN SILVER SHAFT. ; INFO FROM LAND.ST :(1979)

Commodities

Commodity Importance
Silver Primary
Lead Secondary
Copper Secondary
Gold Secondary
Silica Secondary
Molybdenum Tertiary

Materials information

Materials Type of material
Argentite Ore
Chrysocolla Ore
Galena Ore
Silver Ore
Wulfenite Ore
Limonite Gangue
Quartz Gangue

Host and associated rocks

  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic)
    Stratigraphic age (youngest) Pliocene
    Stratigraphic age (youngest) Neoproterozoic
  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Intermediate Volcanic Rock > Andesite
    Rock unit name Oracle Granite Of Peterson;Vesicular Andesite
    Rock description Oracle Granite Of Peterson;Vesicular Andesite
  • Host or associated Host
    Rock type Plutonic Rock > Granitoid > Granite

Nearby scientific data

(1) -111.81821, 32.66816
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description E-W Striking Fault With Minor Nw Striking Faults
Type of structure Local
Structure description E-W Fracture Zone With Minor Nw Striking Faults, Mf-934 Maps E-W, Mineralized Zone, Mainly In Oracle Granite, With Some Adjacent Tertiary Andesite

Ore body information

  • General form LENSES
    Thickness 15.24M
    Length 1828.8M

Controls for ore emplacement

  • E-W Fractures, Minor Nw Striking Faults, Main Ew Vein Dips 75-77 S

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1885
Year of first production 1905
Year of last production 1955

Workings at the site

  • Type of workings Underground
    Overall depth 73.15M

Comments on the workings information

  • LARGEST AND EARLIEST WORKINGS ARE THE HORN SILVER SHAFT WITH LEVELS AT 96, 200, AND 240 FT, OPENED BY AN INCLINED SHAFT AND ADIT; OTHER WORKINGS INCLUDE THE SILVER NUGGET AND LEAD BOLDER AS WELL AS OTHER SMALLER WORKINGS

Comments on development

  • PREVIOUS OWNERS AND OPERATORS INCLUDE WM. FORBACH (1917); SILVER REEF M + M (1926, 1930); AZ. LEASING AND DEVELOPMENT (1927-1928); ALBERT C. FORBACH (1942); S.B. OWENS (1951) CLAIMS INCLUDE HORN SILVER, HORN SILVER NO. 1 AND NO. 2, SANTIAGO, NUGGET, NUGGET FRACTION, NUGGET EXTENSION, SAHUARA, CHOLLA, LEAD BOUDLER, SILVER NUGGET; THESE SAME CLAIMS ARE ALSO CALLED SILVER REEF NO. 1 TO NO. 9, (UPP. 3369); MAY ALSO HAVE BEEN OPERATED IN 1905 BY AZ. MERCANTILE TRANSPORATION AND SMELTING CO.

Reference information

Bibliographic references

  • Deposit

    ABGMT-USBM FILE DATA

  • Deposit

    ADMR FILE DATA

  • Deposit

    BLM DISTRICT SHEET 561

  • Deposit

    USGS. MF-934

  • Deposit

    PHILLIPS, K.A., 1987, ARIZONA INDUSTRIAL MINERALS: ARIZONA DEPARTMENT OF MINES AND MINERAL RESOURCES MINERAL REPORT 4, 185 P.

  • Other Database

    CIMRI

General comments

Subject category Comment text
Deposit Discovery Year: 1880'S
Deposit 3 TO 4 VEINS IN FAULT ZONES; MAJOR VEIN STRIKES N79E AND IS TRACEABLE FOR 6000 FT. VEIN WIDTH VARIABLE FROM A FEW FEET IN WEST TO 25-50 FT IN EAST. SILICEOUS SILVER ORES WITH COPPER, GOLD AND LEAD.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAR-1982 Roth, Frances A. (Gest, Don E.) Arizona Bureau of Geology and Mineral Technology
Updater 01-OCT-1993 Orris, Greta J. U.S. Geological Survey

Beyond USGS

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

Maps centered on this site

Authoritative Arizona resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.