Robertson - Triplet Project

The Robertson - Triplet Project is a gold mine located in Lander county, Nevada.

About the MRDS Data:

All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.

Mine Info

Name: Robertson - Triplet Project  

State:  Nevada

County:  Lander


Commodity: Gold

Lat, Long: 40.31194, -116.69389

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Satelite image of the Robertson - Triplet Project

Robertson - Triplet Project MRDS details

Site Name

Primary: Robertson - Triplet Project
Secondary: Robertson South Joint Venture
Secondary: Tenabo Mine
Secondary: Robertson Mine
Secondary: Triplet Gulch project (Lode)
Secondary: 39A Zone
Secondary: Altenburg Hill
Secondary: Gold Pan Zone
Secondary: Porphyry Zone
Secondary: Widow's Mine Zone


Primary: Gold


State: Nevada
County: Lander
District: Bullion District

Land Status

Land ownership: Private
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.


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Owner Name: Coral Gold Resources Ltd.
Info Year: 2004


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Record Type: Site
Operation Category: Producer
Deposit Type: Distal Disseminated
Operation Type: Surface-Underground
Year First Production: 1989
Year Last Production: 1989
Years of Production:
Significant: Y


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Mineral Deposit Model

Model Name: Distal disseminated Ag-Au
Model Name: Sediment-hosted Au


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Role: Host
Age Type: Host Rock Unit
Age Young: Ordovician

Analytical Data

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Ore: Gold


Comment (Commodity): Ore Materials: free gold

Comment (Economic Factors): Reserves for the Robertson deposit in 1988 were reported as 11 million tons of ore grading 0.04 ounces of gold per ton. In 1993 a geologic resource of 20 million tons grading 0.036 ounces of gold per ton and in 1996 a geologic resource of a million ounces of gold was reported for Robertson. Reserves for the Triplet deposit in 1988 were reported as a million tons of ore. In 2000, a drill indicated resource of 4.7 million tons of ore grading 0.077 ounces of gold per ton was reported for the 39A deposit. In 2000, a drill indicated resource of 2.1 million tons of ore grading 0.019 ounces of gold per ton was reported for the Altenburg deposit, and in 1999, 21,300 measured ounces of gold was reported. In 2000, a drill indicated resource of 6.1 million tons of ore grading 0.28 ounces of gold per ton was reported for the Gold Pan deposit, and in 1999, 91,400 measured ounces of gold was reported. In 2000, a drill indicated resource of 20 million tons of ore grading 0.02 ounces of gold per ton was reported for the Porphyry deposit, and in 1999, 254,678 proven and probable reserve ounces of gold were reported. In 2000, a drill indicated resource of 2.9 million tons of ore grading 0.016 ounces of gold per ton was reported for the Widow's Mine deposit, and in 1999, an inferred 37,300 ounces of gold were reported. The only reported lode production for Robertson was 3,700 ounces of gold in 1989.

Comment (Identification): This record combines all information from the earlier MRDS records W700593, M242954, M242953 for individual portions of this project.

Comment (Location): The mine area is located near the mouth of Triplet Gulch and Mill Gulch just south of the historic site of Tenabo.

Comment (Workings): There are numerous old surface and underground workings in the area with more recent open pit development. Some of the early development work was on the placer deposit in Triplet Gulch, but the more recent development is on the lode deposits.

Comment (Development): The deposit was discovered in the mid-1980s, and ore production capacity was expected to be between 300,000 and 500,000 tonnes/year. Further drilling was anticipated in 1988 to further delineate the northern extent of the orebody. Mining was to begin in fall of 1988 and to last about 3 years, but production was only reported for 1989 before operations ceased. Explration resumed in the early 2000s and in 2002, Coral Gold Corp. began a 9,000-foot drill program on their Robertson South joint venture property. The drilling was focused in two areas where previous drilling encountered anomalous gold mineralization. In 2004, Coral Gold Resources Ltd. announced that it had received approval from the Bureau of Land Management to conduct additional exploratory drilling at its 100% owned Robertson Property. Drilling was to commence in November 2004 and was expected to take less than one month to complete. The new program will consist of drilling 10 reverse circulation holes totaling about 7,000 ft. The purpose of the drilling is to expand the current indicated mineral resources in the 39A and Porphyry Zones. These resources are currently estimated to contain 2.8 million tons of mineralized material at a grade of 0.101 oz Au/t and 3.95 million tons of mineralized material at a grade of 0.040 oz Au/t, respectively. The drilling will be targeted specifically at expanding high-grade portions of the two resources. The best results from the April 2004 drilling program in the 39A Zone were returned in hole CR04-8, which intersected 135 ft that averaged 0.074 oz Au/t, from 600 ft, using a 0.02 oz Au/t cutoff grade. Included within this intercept is a 30 ft interval that averaged 0.229 oz Au/t, starting at 675 ft.


Reference (Deposit): Mining Magazine, January 1989, p. 44.

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): Coral Resources, Inc., 1988, Plan of operations for the proposed Triplet Gulch Project, Lander Co., Nevada: on file at NBMG.

Reference (Deposit): Bonham, H.F., 1988, in NBMG MI-1987.

Reference (Deposit): Press clippings, NBMG Mining District File 151.

Nevada Gold

Gold Districts of Nevada

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.