1. Mineral Resources
  2. Online Spatial Data
  3. Mineral Resource Data System (MRDS)

Gold Acres Deposit

Producer in Lander county in Nevada, United States with commodities Gold, Tungsten, Copper, Antimony, Arsenic, Mercury, Thallium, Lead, Zinc, Molybdenum
Map
XML
JSON
KML
A
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. Ownership information
  18. Production statistics
  19. Reserves and resources
  20. Workings at the site
  21. Links to other databases
  22. Bibliographic references
  23. General comments
  24. Reporter information

Geologic information

Identification information

Deposit ID 10069103
MRDS ID W002496
Record type Site
Current site name Gold Acres Deposit
Alternate or previous names Little Gold Acres, Old Kennecott Group, Lime Point, Lakin, Maloney, Little Squirt
Related records 10246211, 10310461, 10125727

Geographic coordinates

Geographic coordinates: -116.73982, 40.25213 (WGS84)
Elevation 1695
Relative position 47 KM SE OF BATTLE MOUNTAIN, NEVADA

Site location context

Political divisions (FIPS codes)

Lander(county)

Nevada(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Tenabo(quadrangle 1:24,000 scale)

Crescent Valley(quadrangle 1:100,000 scale)

Winnemucca(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Middle Humboldt(hydrologic unit)

Humboldt(hydrologic accounting unit)

Black Rock Desert-Humboldt(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 Lander

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 028N;028N 046E; 046E 36;31 Nevada

Comments on the location information

  • ON THE EASTERN FLANK OF THE NORTHERN SHOSHONE RANGE. UTM'S TO HISTORIC LITTLE GOLD ACRES MINE.

Commodities

Commodity Importance
Gold Primary
Tungsten Critical Secondary
Copper Secondary
Antimony Critical Tertiary
Arsenic Critical Tertiary
Mercury Tertiary
Thallium Tertiary
Lead Tertiary
Zinc Critical Tertiary
Molybdenum Tertiary

Comments on the commodity information

  • DISSEMINATED SUBMICRON NATIVE GOLD.

Materials information

Materials Type of material
Galena Ore
Gold Ore
Molybdenite Ore
Pyrite Ore
Pyrrhotite Ore
Scheelite Ore
Sphalerite Ore

Alteration

  • (Local) See Comments

Analytical data

Result TENOR 0.06-0.30 OZ/TON

Mineral occurrence model information

Model code 172
USGS model code 26a
Deposit model name Carbonate-hosted Au-Ag
Mark3 model number 15

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Granitoid > Quartz Monzonite
    Stratigraphic age (youngest) Cretaceous
    Chronological age 98
  • Host or associated Host
    Rock type Sedimentary Rock > Carbonate > Limestone
    Rock unit name Roberts Mountains Formation;Valmy Formation;Valmy Formation;Elder Sandstone
    Rock description Roberts Mountains Formation;Valmy Formation;Valmy Formation;Elder Sandstone

Economic information

Geologic structures

Type of structure Regional
Structure 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 of structure Local
Structure 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.

Ore body information

  • General form TABULAR
    Strike N 40 DEG W
    Dip LOW ANGLE SW
    Thickness 36.58M
    Length 304.8M
    Width 152.4M
    Depth to top 3.05M
  • General form TABULAR
    Dip LOW ANGLE SW
  • General form TABULAR
    Dip LOW ANGLE SW

Controls for ore emplacement

  • Carbonaceous Silty Limestone Of Roberts Mountains Formation Provided A Favorable Host For Gold Deposition. Northeast-Striking High Angle Normal Faults Served As Conduits For Mineralizing Fluids. The Majority Of Gold Was Deposited In An Imbricated Thrust Zone Below The Roberts Mountains Thrust Within The Roberts Mountains Formation. The Upper Skarn May Have Acted As A Caprock.

Comments on the geologic information

  • 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.

Economic information about the deposit and operations

Development status Producer
Commodity type Metallic
Deposit size Medium
Significant No
Discovery year 1925
Discoverer Lee Lakin
Year of first production 1935
Production years 1936-1961; 1973-1983; 1987-PRESENT (11/91).

Mining district

District name Bullion District

Ownership information

  • Type Owner-Operator
    Owner Cortez Gold Mines

Production statistics

  • Year 1961
    Period 1936-1961
    Material AU ORE
    Accuracy Estimate
    Description Cp_Grade: ^0.041 Oz Au/Ton Leached
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Gold Gold 1g/mt

Comments on the production information

  • PRODUCTION INCLUDES A SMALL AMOUNT OF TUNGSTEN AND COPPER.

Reserves and resources

  • Type In-situ
    Estimate year 1987
    Total resources 2176000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 2.964 g/mt Gold Major 1987
  • Type In-situ
    Estimate year 1988
    Total resources 2448000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 2.625 g/mt Gold Major 1988
  • Type Milling
    Estimate year 1972
    Commodity Subtype Grade units Group Importance Year
    Gold Au 3.501 g/mt Gold Major 1972
  • Type Leaching
    Estimate year 1972
    Commodity Subtype Grade units Group Importance Year
    Gold Au 1.157 g/mt Gold Major 1972
  • Type In-situ
    Name SOUTH PIT-LITTLE GOLD ACRES
    Estimate year 1973
    Commodity Subtype Grade units Group Importance Year
    Gold Au 2.992 g/mt Gold Major 1973
  • Type In-situ
    Name NORTH PIT-GOLD ACRES
    Estimate year 1990
    Commodity Subtype Grade units Group Importance Year
    Gold Au 3.331 g/mt Gold Major 1990

Workings at the site

  • Type of workings Surface/Underground
    Length 914.4M
    Overall length 457.2M
    Overall width 304.8M

Comments on the workings information

  • 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.

Comments on 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

Reference information

Bibliographic references

General comments

Subject category Comment text
Deposit Discovery Year: 1920'S
Deposit ORE LOCALIZED IN ROBERTS MTN THRUST-FAULT-BRECCIA ZONE, ADJACENT TO SILL; MINERALIZED WITH NATIVE GOLD, MOLYBDENITE AND SCHEELITE.
Deposit THIS RECORD IS AN UPDATED VERSION INCLUDING DUPLICATE INFORMATION FROM RECORDS #M232510 AND #M232517 WHICH HAVE BEEN DELETED.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAY-1974 Reeves, James R. U.S. Geological Survey
Updater 01-NOV-1980 Kirkham, Richard A. Nevada Bureau of Mines and Geology
Updater 01-NOV-1990 Skurski, M. (Marcus, Sue) U.S. Geological Survey
Updater 01-OCT-1991 Moyer, Lorre A. (Marcus, S.M.) U.S. Geological Survey
Updater 01-NOV-1991 Phinisey, J. D. (Marcus, S.) U.S. Geological Survey
Updater 01-SEP-1994 Li, Zhiping (Moyer, Lorre A.) U.S. Geological Survey

Beyond USGS

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

External references

Maps centered on this site

Authoritative Nevada resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.