Gold Acres Deposit

The Gold Acres Deposit is a gold mine located in Lander county, Nevada at an elevation of 5,561 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: Gold Acres Deposit
Secondary: Little Gold Acres
Secondary: Old Kennecott Group
Secondary: Lime Point
Secondary: Lakin, Maloney
Secondary: Little Squirt

Commodity

Primary: Gold
Secondary: Tungsten
Secondary: Copper
Tertiary: Antimony
Tertiary: Arsenic
Tertiary: Mercury
Tertiary: Thallium
Tertiary: Lead
Tertiary: Zinc
Tertiary: Molybdenum

Location

State: Nevada
County: Lander
District: Bullion District

Land Status

Not available

Holdings

Not available

Workings

Type: Surface/Underground

Ownership

Owner Name: Cortez Gold Mines

Production

Year: 1961
Time Period: 1936-1961
Material type: AU ORE
Description: Cp_Grade: ^0.041 Oz Au/Ton Leached

Deposit

Record Type: Site
Operation Category: Producer
Operation Type: Unknown
Year First Production: 1935
Discovery Year: 1925
Years of Production:
Organization:
Significant: N
Deposit Size: M

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: Carbonate-hosted Au-Ag

Orebody

Form: TABULAR

Form: TABULAR

Form: TABULAR

Structure

Type: R
Description: Reg.Struct: Gold Acres Is Exposed At The Western Margin Of The Gold Acres Window Along The Nw-Trending Roberts Mountains Thrust, Cortez-Uinta Axis. It Lies Along The Eureka-Battle Mountain Trend Of Aligned Intrusives And Mineralization.

Type: L
Description: Common High Angle Normal Faulting At Numerous Orientations Has Broken The Mineralized Zone Into Three Parts: The Main Gold Acres Orebody, Little Squirt Orebody, And Little Gold Acres Orebody.

Alterations

Alteration Type: L
Alteration Text: See Comments

Rocks

Name: Quartz Monzonite
Role: Associated
Age Type: Associated Rock
Age in Years: 98.000000+-
Age Young: Cretaceous

Analytical Data

Analytical Data: TENOR 0.06-0.30 OZ/TON

Materials

Ore: Gold
Ore: Pyrite
Ore: Sphalerite
Ore: Galena
Ore: Molybdenite
Ore: Scheelite
Ore: Pyrrhotite

Comments

Comment (Deposit): Discovery Year: 1920'S

Comment (Commodity): DISSEMINATED SUBMICRON NATIVE GOLD.

Comment (Production): PRODUCTION INCLUDES A SMALL AMOUNT OF TUNGSTEN AND COPPER.

Comment (Location): ON THE EASTERN FLANK OF THE NORTHERN SHOSHONE RANGE. UTM'S TO HISTORIC LITTLE GOLD ACRES MINE.

Comment (Deposit): ORE LOCALIZED IN ROBERTS MTN THRUST-FAULT-BRECCIA ZONE, ADJACENT TO SILL; MINERALIZED WITH NATIVE GOLD, MOLYBDENITE AND SCHEELITE.

Comment (Workings): DIMENSIONS ARE ESTIMATES FROM MAP BY KETNER. 3000 FEET OF UNDERGROUND WORKINGS; OPEN PIT MINE. LITTLE GOLD ACRES IS NOW PART OF GOLD ACRES OPEN PIT.

Comment (Geology): THE DEPOSIT IS IN THE WEST EDGE OF A WINDOW IN THE UPPER PLATE OF THE ROBERTS MTN THRUST, AND IS LOCALIZED IN THE BRECCIATED CHERT AND LIMESTONE IN THE LOWER PLATE (SILICEOUS, VOLCANIC AND CARBONATE ROCK ASSEMBLES). SHEAR ZONE IS BETWEEN LIMESTONE AND SILL; SANDSTONE AND CHERT OVERLIE SILL. BLOCKS OF TACTITE WITHIN SHEAR ZONE ARE MINERALIZED. THE INTRUSIVE CONTAINS MINOR PYRRHOTITE. THE BRECCIA ZONE CONTAINS DISSEMINATED FE-OXIDES AND GOLD AS SUBMICROSCOPIC PARTICLES. THE INTRUSIVES EXPOSED IN THE PIT HAVE BEEN DATED AS 98 MY OLD (WRUCKE). THE SURROUNDING COUNTRY ROCKS HAVE BEEN PYROMETASOMATIZED TO VARIOUS DEGREES, WITH THE INTRODUCTION OF SOME SCHEELITE. TACTITES ZONES BEST DEVELOPED IN THE LOWER PLATE ROCKS. EPITHERMAL AU MINERALIZATION MAY BE OVERPRINTED ON CRETACEOUS TACTITE CU-ZN MINERALIZATION. THE OREBODY STRIKES N40W, DIPPING NEARLY FLAT TO THE SW. THE ORE LIMITS ARE DETERMINED BY ASSAY VALUES. GOLD IS HOSTED PRIMARILY IN THE SILURIAN ROBERTS MOUNTAINS FORMATION.

Comment (Deposit): THIS RECORD IS AN UPDATED VERSION INCLUDING DUPLICATE INFORMATION FROM RECORDS #M232510 AND #M232517 WHICH HAVE BEEN DELETED.

Comment (Development): GOLD MINING FROM THE NORTH ORE ZONE (GOLD ACRES) BEGAN IN 1935, FIRST BY UNDERGROUND METHODS THEN BY OPEN PIT AFTER 1942. FROM 1942-1961, GOLD ACRES PRODUCED $10 MILLION IN GOLD AND SILVER AND WAS ONE OF THE LARGEST GOLD PRODUCERS IN NEVADA IN THE 1950'S. PLACER DOME U.S., INC. BECAME ACTIVE IN THE GOLD ACRES AREA IN 1969 BY CONSOLIDATING THE LAND POSITION AND BY DRILLING. BY 1973, MINEABLE RESERVES FOR WHAT BECAME THE SOUTH PIT (LITTLE GOLD ACRES) WERE ESTIMATED AT 1.6 MILLION TONS/0.106 OPT GOLD. CORTEZ GOLD MINES MINED LITTLE GOLD ACRES FROM 1973-1976. HEAP LEACHING AND MILLING OF GOLD ACRES DUMPS AND STOCKPILES FOLLOWED UNTIL 1983. DEVELOPMENT DRILLING CONTINUED 1984-1986. IN 1987, MINING ACTIVITY WAS REACTIVATED AT THE NORTH PIT WHERE A REFRACTORY MINEABLE RESERVE OF 2.2 MILLION TONS/0.118 OPT GOLD IS BEING EXPLOITED. ; ECON.COM: DISSEMINATED-TYPE DEPOSIT

References

Reference (Deposit): USBM (WINNEMUCCA) MILLS NO. 54, REF. NO. 3201500052, MINERAL PROPERTY FILE 74.500

Reference (Deposit): THE NEVADA MINERAL INDUSTRY 1990; NBMG SPECIAL PUBLICATION MI-1990, P.22.

Reference (Deposit): ROBERTS, R. J., ET AL, 1971, GOLD-BEARING DEPOSITS IN NORTH-CENTRAL NEVADA AND SOUTHWESTERN IDAHO: ECON. GEOL. 66 (1): 14-33

Reference (Deposit): HAYS, R.C., AND FOO, S.T., 1991, GEOLOGY AND MINERALIZATION OF THE GOLD ACRES DEPOSIT LANDER COUNTY, NEVADA, IN RAINES, G.L., LISLE, R.E., SCHAFER,R.W. AND WILKINSON, W.H., EDS., SYMPOSIUM PROCEEDINGS, GEOLOGY AND ORE DEPOSITS OF THE GREAT BASIN, GEOLOGIC SOCIETY OF NEVADA AND THE U.S. GEOLOGICAL SURVEY APRIL 1-5, 1990 P. 677-685.

Reference (Deposit): MCCORMACK, JOHN, 1991, WRITTEN COMMENTS ON RECORDS, 18 OCT/91.

Reference (Deposit): NBMG, 1994, MI-1993

Reference (Deposit): 1957 RECON KETTNER, K. B.; REPORT

Reference (Deposit): 1969 GEOCHEM WRUCKE, C., ET AL; ANOMALY

Reference (Production): ROBERTS, R. J., ET AL, ECONOMIC GEOLOGY 66(1): 14-33. STAGER, H.K., 1977. NBMG SPEC. PUB. MI-1990. NBMG MI-1993

Reference (Reserve-Resource): NBMG SPEC. PUB. MI-1990 NBMG MI-1993

Reference (Deposit): STAGER, H.K. (1977) GEOLOGY AND MINERAL RESOURCES OF LANDER CO., NEVADA; NBMG BULL 88

Reference (Deposit): VANDERBURG, W.. (1939) RECONNAISSANCE OF MINING DISTRICTS IN LANDER CO., NEVADA; USBM I.C. 7043.

Reference (Deposit): ANCTIL, R.J. (1967) GOLD ACRES PROJECT, REPORT PREPARED FOR UNION PACIFIC LAND CO.

Reference (Deposit): KETNER, K. B., 1965, GOLD ACRES MINE, IN GILLULY, J., AND GATES, O., TECTONIC AND IGNEOUS GEOLOGY OF THE NORTHERN SHOSHONE RANGE: USGS PROFESSIONAL PAPER 465, P. 134-135

Reference (Deposit): KOSCHMAN, A. H., AND BERGENDAHL, M. H., 1968, PRINCIPAL GOLD-PRODUCING DISTRICTS OF THE UNITED STATES: USGS PROF. PAPER 610, P. 184

Reference (Deposit): WRUCKE, C.T. (1974) GEOLOGIC MAP OF THE TENABO AREA, LANDER CO. NEVADA, USGS MAP MF-647.

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.