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Cimarron Gold Property

Past Producer in Nye county in Nevada, United States with commodities Gold, Silver
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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. Alteration
  9. Mineral occurrence model information
  10. Host and associated rocks
  11. Nearby scientific data
  12. Geologic structures
  13. Ore body information
  14. Controls for ore emplacement
  15. Economic information about the deposit and operations
  16. Mining district
  17. Land status
  18. Ownership information
  19. Bibliographic references
  20. General comments
  21. Reporter information

Geologic information

Identification information

Deposit ID 10310477
MRDS ID M231755
Record type Site
Current site name Cimarron Gold Property
Alternate or previous names North Breccia Mineralized Zone, San Antone Mineralized Zone, CO8 Mineralized Zone, West Adit Mineralized Zone, West ore pod, Central ore pod, East ore pod, San Antonio Mine, Cimarron Group
Related records 10044352

Comments on the site identification

  • This record incoporates material from MRDS record #M231755 for the historic Cimarron/San Antonio Mine workings, but describes the more recently identified Cimarron Gold deposit.

Geographic coordinates

Geographic coordinates: -117.2537, 38.3416 (WGS84)
Elevation 2070
Relative position The Cimarron Gold Property is located about 25 miles NNE of Tonopah.\n

Site location context

Political divisions (FIPS codes)

Nye(county)

Nevada(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Liberty Springs(quadrangle 1:24,000 scale)

Tonopah(quadrangle 1:100,000 scale)

Tonopah(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Southern Big Smoky Valley(hydrologic unit)

Central Nevada Desert Basins(hydrologic accounting unit)

Central Nevada Desert Basins(hydrologic subregion)

Great Basin(hydrologic region)

Federal lands

Bureau of Land Management(Bureau of Land Management NV)

Bureau of Land Management NV BLM(Type of land area)

BLM(Federal land areas administered by BLM)

Geographic areas

Country State County
United States Nevada Nye

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 006N 042E 34 35 Nevada

Comments on the location information

  • The Cimarron Gold Property consists of 30 unpatented mineral claims in the north central part of the San Antonio Mountains, about 25 miles NNE of Tonopah.

Commodities

Commodity Importance
Gold Primary
Silver Primary

Comments on the commodity information

  • Ore Materials: native gold
  • Gangue Materials: quartz

Materials information

Materials Type of material
Gold Ore
Quartz Gangue

Alteration

  • (Local) bleaching and argillization of host rocks

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 Host
    Rock type Volcanic Rock (Aphanitic) > Pyroclastic Rock > Tuff > Ash-Flow Tuff
    Rock type qualifier rhyolitic to dacitic
    Rock unit name Tonopah Formation
    Stratigraphic age (youngest) Miocene
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Rhyolite
    Rock type qualifier intrusive flows, domes, dikes
    Rock unit name Tonopah Formation
    Stratigraphic age (youngest) Miocene
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Dacite
    Rock unit name Tonopah Formation
    Stratigraphic age (youngest) Miocene
  • Host or associated Associated
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Argillite
    Stratigraphic age (youngest) Permian
  • Host or associated Associated
    Rock type Metamorphic Rock > Metavolcanic Rock > Mafic Metamorphic Rock > Greenstone
    Rock type qualifier greenstone
    Stratigraphic age (youngest) Permian
  • Host or associated Associated
    Rock type Sedimentary Rock > Chemical Sediment > Chert
    Stratigraphic age (youngest) Permian

Nearby scientific data

(1) -117.2537, 38.3416
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description The Cimarron deposit lies along the northeastern margin of the Walker Lane mineralized structural zone
Type of structure Local
Structure description The Cimarron property is situated at the intersection of this northwest-trending regional structure and a northerly-trending belt of productive (+1 Moz) gold deposits .

Ore body information

  • General form seams and bunches

Controls for ore emplacement

  • High-grade gold mineralization occurs within quartz veins, vein stockworks and breccia zones along northwest-trending structures. Mineralization also commonly follows the margins of intrusive flow domes and dikes. The strongest mineralization in the main resource area occurs where high-angle NW- and N-trending structures intersect a gently-dipping coarse-grained tuff, resulting in stratiform, gently-dipping mineralization within the tuff, marginal to the structures.

Comments on the geologic information

  • Tertiary (Miocene) volcanic sequence including ash-flow tuffs, tuffaceous sedimentary rocks and intrusive rhyolite flow domes and dikes.
    Paleozoic sedimentary rocks (argillites, greenstone, chert) underlie the volcanics; the contact is locally 75 to 200m beneath mineralized areas. Post-mineralization volcanic units locally conceal mineralization.

Economic information about the deposit and operations

Operation type Underground
Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant Yes
Year of first production 1937
Year of last production 1970
Production years 1937-1940

Mining district

District name San Antone District

Land status

Ownership category BLM Administrative Area
Area name Tonopah BLM Administrative District

Ownership information

  • Type Owner
    Owner Landore Resources, Inc.
    Year 2004
  • Type Operator
    Owner Bullion River Gold Corp. (optionee)
    First year 2004
    Last year 2005

Comments on the workings information

  • Workings consist of three adits, several shafts, and numerous drill holes

Comments on other economic factors

  • A resource of 50,000 ounces in three zones was estimated in 1988 for the Cimarron mine area, using about 190 drill holes and a cutoff grade of 10 feet of .015 opt gold (.5 g/t over 3m).
    The 1988 resource was reported as 850 kilotonnes of material grading 0.053 ounces of gold per ton. In 1997, resources were reported as 1.5 million tons grading 0.034 ounces of gold per ton for a total of 51,500 ounces of gold.

Comments on development

  • The historic Cimarron/San Antonio Mine operated from 1937 to 1940, producing one verified shipment of 9.6 tons of ore containing 13.3 ounces of gold and 47.2 ounces of silver with a gross value of $447.64 (1937). In 1950, Chicago interests leased some of the claims and planned to drive a 400-foot crosscut to the gold-bearing zone, but no significant production resulted. The property was owned by Margaret Booth and Mrs. D.A. Orton in the early 1970s at which time there was still some small-scale underground mining that ceased soon thereafter.
    Since that time, 6 exploration programs have been conducted in the district. The principal efforts have been by Newmont Mining (1980-1981), Gold Fields (1985), Echo Bay (1987-1988) and Romarco (1995-1997). In 1996, the Cimarron gold property was joint-ventured by Romarco Minerals and Brancote USA, a wholly owned subsidiary of Landore Resources Inc., with operator Romarco holding a 70% interest. That year, Romarco drilled 22 shallow reverse circulation holes at the Cimarron property. Brancote optioned the Cimarron property to Cimarron Mining Corp., a wholly-owned subsidiary of Bullion River Gold Corp in 2004-2005. About 290 holes have been drilled, mostly within the main resource area.
    Drilling has intersected gold mineralization in each of seven zones in the Cimarron area. A resource of 50,000 ounces in three of these zones was estimated in 1988 using about 190 drill holes and a cutoff grade of 10 feet of .015opt Au (.5 g/t over 3m). The main resource is contained in three mineralized pods adjacent to a dacitic done: the West, Central, and East pods. Exploration and production potential exists within the main resource area with the potential to expand mineralization at depth and to the southeast under post-mineralization volcanics and colluvium. Additional mineralization is contained in four outlying mineralized zones to the northwest: the San Antonio, North Breccia, CO8, and West Adit zones. The West adit is an under-explored zone. Only 1 properly-drilled hole tests the vein zone (2 holes total), and high-grade mineralization was encountered (11.5 g/t over 1.5m; see preceding section). The mineralization is open at depth and along strike. Additional mineralization in this area, which is near the main resource, could add to the overall resource tonnage

Reference information

Bibliographic references

General comments

Subject category Comment text
Deposit The Cimarron gold deposit is a low-sulfidation volcanic-hosted, epithermal gold system containing disseminated and quartz-vein stockwork mineralization with locally high grades (>20 g/t gold). At least seven zones of mineralization have been identified; three of these contain a combined resource of at least 50,000 ounces gold and remain open.
The three zones cover about 44 acres (.18 sq km), wrapping around the northwest side of an intrusive rhyolite dome.
Only a few holes used in the resource calculation exceed a depth of 160m (500ft), and most are within 100m of surface. A number of holes bottom in mineralization.
Only 21 additional holes have been drilled in the resource area since 1988, and most of these holes encountered mineralization
High-grade gold mineralization occurs within quartz veins, vein stockworks and breccia zones along northwest-trending structures. Mineralization also commonly follows the margins of intrusive flow domes and dikes. High-grade mineralization occurs within an area of at least 2 km strike length and up to 1 km in width.
Examples of high-grade (+.25 opt Au, + 8.6 g/t Au) gold values occur in outcrops and underground workings
The strongest mineralization in the main resource area occurs where high-angle NW- and N-trending structures intersect a gently-dipping coarse-grained tuff, resulting in stratiform, gently-dipping mineralization within the tuff marginal to the structures.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-FEB-2005 LaPointe, D.D. Nevada Bureau of Mines and Geology
Editor 01-SEP-2007 Schruben, Paul G. U.S. Geological Survey Converted from S&A FileMaker format to Oracle. Edit checks on rocks, units, and ages with Geolex search, and other fields.

Beyond USGS

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

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