Roberts Copper Mine

The Roberts Copper Mine is a copper mine located in Humboldt county, Nevada at an elevation of 5,850 feet.

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

Satelite View

MRDS mine locations are often very general, and in some cases are incorrect. Some mine remains have been covered or removed by modern industrial activity or by development of things like housing. The satellite view offers a quick glimpse as to whether the MRDS location corresponds to visible mine remains.

Site Name

Primary: Roberts Copper Mine
Secondary: Patterson Property
Secondary: Cove Meadow Deposit
Secondary: Ne Plus Ultra Claims Patented
Secondary: NBMG Sample Site 2442

Commodity

Primary: Copper
Secondary: Silver
Secondary: Gold
Tertiary: Iron
Tertiary: Tungsten

Location

State: Nevada
County: Humboldt
District: Varyville District

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.

Holdings

Not available

Workings

Not available

Ownership

Owner Name: Charles Roberts, Caldwell, Id
Years: 1984 -

Production

Year: 1949
Time Period: To 1949
Material type: ORE CU AC
Description: Cp_Grade: ^Ave. 5.1% Cu Also Au. Ag

Deposit

Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Year First Production: 1948
Discovery Year: 1875
Years of Production:
Organization:
Significant: N
Deposit Size: S

Physiography

General Physiographic Area: Intermontane Plateaus
Physiographic Province: Basin And Range Province
Physiographic Section: Great Basin
Physiographic Detail: Basin And Mountains

Mineral Deposit Model

Model Name: Polymetallic veins

Orebody

Form: TABULAR, LENSES

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Silicification, Chloritization

Rocks

Name: Diorite
Role: Associated
Age Type: Host Rock Unit
Age Young: Late Permian

Name: Diorite
Role: Associated
Age Type: Associated Rock
Age Young: Pliocene

Name: Diorite
Role: Associated
Age Type: Host Rock
Age Young: Late Jurassic

Analytical Data

Analytical Data: 5.1 % CU IN HAND-SORTED ORE, 1949. SAMPLE 2442 CONTAINS 10 % FE, 2 % MG, 0.07 % CA, 0.15 % TI, 2000 PPM MN, 200 PPM AG, 500 PPM B, 1000 PPM BA, 100 PPM CO, +20000 PPM CU, 10 PPM MO, 20 PPM NI, 5 PPM SC, 300 PPM V, 50 PPM W, 10 PPM Y, 10 PPM ZR, AND 0.1 PPM AU, BY AA ANALYSIS.

Materials

Ore: Malachite
Ore: Magnetite
Ore: Limonite
Ore: Cuprite
Ore: Chrysocolla
Ore: Copper

Comments

Comment (Geology): SHEAR ZONE RANGES FROM 3 TO 35 FT THICK AND SEVERAL THOUSANDS OF FEET LONG; SCHISTOSE PROPERTY CONSISTS OF A 4 CLAIMS, PATENTED IN 1883 (NE PLUS ULTRA, CHANCERY, MATCHBOX, AND VULCAN CLAIMS.) AND ONE UNPATENTED CLAIM(THE COVE MEADOW)

Comment (Location): 3 1/2 MILES NE OF BARTLETT PEAK

Comment (Development): HAND-SORTED ORE SHIPPED IN 1948 AND 1949

Comment (Deposit): COPPER MINERALIZATION ASSOCIATED WITH DIORITE DIKE WHICH IS IN A FAULT ZONE. COUNTRY ROCK ALSO DIORITE. WIDE-SPREAD COPPER OXIDES.; MODEL NAME COULD ALSO BE: KUROKO MASSIVE SULFIDE.

Comment (Workings): SURFACE CUTS, SHALLOW UNDERGROUND WORKINGS, ONE VERTICAL SHAFT, NUMEROUS DOZER CUTS AROUND SHAFT AND AREA, SHORT ADIT WITH SMALL OPEN PIT DIRECTLY ABOVE IT.

Comment (Deposit): OWNED IN 1960'S BY F.W. ROBERTS; EXPLORED BY SEVERAL SURFACE CUTS AND TWO SHALLOW UNDERGROUND WORKINGS. THE USBM DEVELOPED THE PROPERTY BY DIAMOND-DRILLING 7 HOLES IN THE SHEAR ZONE ADJACENT TO THE FAULT. THE PROPERTY WAS PROBABLY DISCOVERED ABOUT THE 1870'S. PLATS OF THE PATENTED CLAIMS ARE DATED JULY 10, 1883. IN 1948, THE WISBY BROTHERS BUILT A ROAD TO THE DEPOSIT, HAND-SORTED THE ORE, AND SHIPPED IT IN NOV. 1948 (46 TONS AT 2.83 % CU 0.005OZ AU, 1.875 OZ AG. A SECOND SHIPMENT OF 4.2 TONS HAND-SORTED ORE WAS MADE JULY 27, 1949 (7.5 % CU, 0.01 OZ AU, 3.3 OZ AG. PROPERTY CONSISTS OF 4 CLAIMS, PATENTED IN 1883 (NE PLUS ULTRA, CHANCERY, MATCHBOX, AND VULCAN CLAIMS.) AND ONE UNPATENTED CLAIM(THE COVE MEADOW) ; INFO.SRC : 1 PUB LIT; 2 UNPUB REPT; 3 FIELD OBSERV

Comment (Deposit): Discovery Year: 1870'S

Comment (Production): 46 TONS ORE AT 2.83% CU; 0.005 OZ AU, 1.875 OZ AG; 42 TONS AT 7.5% CU, 0.01OZ AU, 3.3 OZ AG

References

Reference (Deposit): WILLDEN, R., 1964, GEOLOGY AND MINERAL DEPOSITS OF HUMBOLDT COUNTY, NEVADA; NBMG, BULL. 59.

Reference (Deposit): TRENGROVE, R.R., 1950, INVESTIGATION OF THE COVE MEADOW COPPER DEPOSIT, HUMBOLDT COUNTY, NEVADA; USBM REPORT OF INV. 4694.

Reference (Deposit): JONES, R.B., 1984, NBMG FIELD EXAMINATION AND SAMPLE ANALYSIS.

Reference (Deposit): NBMG STAFF, 1985, NBMG OFR 85-3.

Reference (Production): WILLDEN, R., 1964

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.