Cimarron Gold Property

Site Name

Primary: Cimarron Gold Property
Secondary: North Breccia Mineralized Zone
Secondary: San Antone Mineralized Zone
Secondary: CO8 Mineralized Zone
Secondary: West Adit Mineralized Zone
Secondary: West ore pod
Secondary: Central ore pod
Secondary: East ore pod
Secondary: San Antonio Mine
Secondary: Cimarron Group

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Commodity

Primary: Gold
Primary: Silver

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Location

State: Nevada
County: Nye
District: San Antone District

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Land Status

Land ownership: BLM Administrative Area
Note: the land ownership field only identifies whether the area the mine is in is generally on public lands like Forest Service or BLM land, or if it is in an area that is generally private property. It does not definitively identify property status, nor does it indicate claim status or whether an area is open to prospecting. Always respect private property.
Administrative Organization: Tonopah BLM Administrative District

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Holdings

Not available

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Workings

Not available

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Ownership

Owner Name: Bullion River Gold Corp. (optionee)
Years: 2004 - 2005

Owner Name: Landore Resources, Inc.
Info Year: 2004

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Production

Not available

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Deposit

Record Type: Site
Operation Category: Past Producer
Deposit Type: epithermal
Operation Type: Underground
Year First Production: 1937
Year Last Production: 1970
Years of Production:
Organization:
Significant: Y
Deposit Size: S

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Physiography

Not available

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Mineral Deposit Model

Model Name: Epithermal vein, Comstock

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Orebody

Form: seams and bunches

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Structure

Type: R
Description: The Cimarron deposit lies along the northeastern margin of the Walker Lane mineralized structural zone

Type: L
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 .

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Alterations

Alteration Type: L
Alteration Text: bleaching and argillization of host rocks

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Rocks

Name: Chert
Role: Associated
Age Type: Associated Rock
Age Young: Permian

Name: Greenstone
Role: Associated
Description: greenstone
Age Type: Associated Rock
Age Young: Permian

Name: Argillite
Role: Associated
Age Type: Associated Rock
Age Young: Permian

Name: Dacite
Role: Host
Age Type: Host Rock
Age Young: Miocene

Name: Rhyolite
Role: Host
Description: intrusive flows, domes, dikes
Age Type: Host Rock
Age Young: Miocene

Name: Ash-Flow Tuff
Role: Host
Description: rhyolitic to dacitic
Age Type: Host Rock
Age Young: Miocene

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Analytical Data

Not available

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Materials

Ore: Gold
Gangue: Quartz

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Comments

Comment (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.

Comment (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

Comment (Commodity): Ore Materials: native gold

Comment (Commodity): Gangue Materials: quartz

Comment (Location): 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.

Comment (Workings): Workings consist of three adits, several shafts, and numerous drill holes

Comment (Geology): 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.

Comment (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.

Comment (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.

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References

Reference (Deposit): NBMG MI-1996

Reference (Deposit): Long, K.R., DeYoung, J.H., Jr., and Ludington, S.D., 1998, Database of significant deposits of gold, silver, copper, lead, and zinc in the United States; Part A, Database description and analysis; part B, Digital database: U.S. Geological Survey Open-File Report 98-206, 33 p., one 3.5 inch diskette.

Reference (Deposit): NBMG MI-1996

Reference (Deposit): Bullion River Gold Corp website: http://www.bullionriver.com/projects/cimarron.html#
URL: http://www.bullionriver.com/projects/cimarron.html

Reference (Deposit): Kleinhampl, F.J. and Ziony, J.I., Geology and Mineral Deposits of Northern Nye Co., 1984, NBMG Bull. 99B.

Reference (Deposit): Northern Miner, 12/2/96.

Reference (Deposit): Kral, V.E., 1951, Mineral Resources of Nye Co.: NBMG Bull. 50, p.161.

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Nevada Gold

Nevada has a total of 368 distinct gold districts. Of the of those, just 36 are major producers with production and/or reserves of over 1,000,000 ounces, 49 have production and/or reserves of over 100,000 ounces, with the rest having less than 100,000 ounces. Read more: Gold Districts of Nevada.