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Freedom Flats Deposit

Producer in Mineral county in Nevada, United States with commodities Gold, Silver, Arsenic, Antimony, Copper, Lead, Zinc, Mercury, Bismuth, Selenium, Tellurium, Nickel
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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 10106950
MRDS ID RE00018
Record type Site
Current site name Freedom Flats Deposit
Alternate or previous names Borealis Mine

Geographic coordinates

Geographic coordinates: -118.76846, 38.37936 (WGS84)
Elevation 2195
Relative position 12 MILES SOUTHWEST OF HAWTHORNE, NV.

Site location context

Political divisions (FIPS codes)

Mineral(county)

Nevada(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Corey Peak(quadrangle 1:24,000 scale)

Excelsior Mountains(quadrangle 1:100,000 scale)

Walker Lake(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

East Walker(hydrologic unit)

Walker(hydrologic accounting unit)

Central Lahontan(hydrologic subregion)

Great Basin(hydrologic region)

Federal lands

Humboldt-Toiyabe National Forest(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State County
United States Nevada Mineral

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 6N 29E 17 SW4 OF NE4 Nevada

Comments on the location information

  • FREEDOM FLATS LIES WITHIN THE LUCKY BOY DISTRICT AS DEFINED BY NEVADA BUREAU OF MINES AND GEOLOGY. IT ALSO LIES WITHIN THE RECENTLY DEFINED BOREALIS DISTRICT (ENG, 1991). OTHER DEPOSITS IN THE BOREALIS DISTRICT ARE BOREALIS, EAST RIDGE, NORTHEAST RIDGE, GOLD VIEW, DEEP ORE FLATS.

Commodities

Commodity Importance
Gold Primary
Silver Primary
Arsenic Critical Secondary
Antimony Critical Secondary
Copper Tertiary
Lead Tertiary
Zinc Critical Tertiary
Mercury Tertiary
Bismuth Critical Tertiary
Selenium Tertiary
Tellurium Critical Tertiary
Nickel Critical Tertiary

Comments on the commodity information

  • AU OCCURS AS SUB-MICRON SIZE PARTICLES IN SULFIDE AND IRON OXIDE MINERALS. AG:AU RATIO RANGES <1:10 IN UPPER PORTION TO >10:1 AT DEPTH, AVERAGES 5:1. AS AND SB HIGHLY ANOMALOUS IN UPPER PORTION, DECREASE WITH DEPTH. CU, PB, ZN SLIGHTLY ENRICHED IN LOWER PORTION OF DEPOSIT.

Materials information

Materials Type of material
Chalcocite Ore
Cinnabar Ore
Covellite Ore
Enargite Ore
Nagyagite Ore
Niccolite Ore
Pyrrhotite Ore
Sphalerite Ore

Alteration

  • (Local) Silicification, Oxidation, Argillization, Propylitization. Conduit For Hydrothermal Fluids Was 100-200 Ft. Wide Core Zone Of Silica Breccia With Abundant Iron Oxide Minerals. Silica Breccia Zone Narrows Downward And Grades Downward Into Oxidized Quartz-Sulfide And Unoxidized Quartz-Pyrite Alteration. Argillic And Propylitic Alteration Zones Develop Outward From Core. Barren Opal And Chalcedonic Silica Overlie Deposit.

Mineral occurrence model information

Model code 154
USGS model code 25e
Deposit model name Epithermal quartz-alunite Au
Mark3 model number 38

Host and associated rocks

  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Intermediate Volcanic Rock > Andesite

Nearby scientific data

(1) -118.76846, 38.37936
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description Walker Lane Structural Zone.
Type of structure Local
Structure description Freedom Flats Fault Zone Strikes Northeast And Dips Steeply Northwest. Movement Is Oblique Slip With Both 100-200 Ft. Of Normal And 500-1000 Ft. Of Left Lateral Displacement.

Ore body information

  • Strike N50E
    Dip STEEP TO SE

Controls for ore emplacement

  • Both Tectonic And Hydrothermal Breccias Are Well Developed And Are Associated With Higher Grade Gold Values. These Vary From Silica Breccia And Silicified Breccia To Poorly Lithified Breccia.

Economic information about the deposit and operations

Development status Producer
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1986
Discoverer Tenneco Minerals
Year of first production 1986
Year of last production 1989
Production years 1986-1989

Mining district

District name Borealis; Ramona; Lucky Boy

Ownership information

  • Type Owner-Operator
    Owner Echo Bay Exploration, Inc.
    Home office 5250 Neil Road. Suite 300, Reno, Nv, 89502

Production statistics

  • Year 1989
    Period 1986-1989
    Material ORE AU
    Accuracy Estimate
    Description Cp_Grade: ^0.153 Opt Gold
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Gold Gold 5g/mt

Comments on the production information

  • FREEDOM FLATS WAS HIGHEST GRADE AND MOST PRODUCTIVE OF THE DEPOSITS MINED IN THE BOREALIS DISTRICT. MINED OUT IN 1989.

Reserves and resources

  • Type In-situ
    Estimate year 1986
    Total resources 567000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 3.36 g/mt Gold Major 1986

Comments on the reserve resource information

  • NO NUMBERS GIVEN FOR AMOUNT OF RESERVES.
  • DISCREPANCY BETWEEN ORIGINAL RESERVE ESTIMATE (149,000 OZ. AU) AND TOTAL PRODUCTION (195,200 OZ. AU) ATTRIBUTED TO SMALL HIGH GRADE ORE LENSES NOT INTERSECTED BY DRILLING AND PROBLEMS WITH SAMPLING METHOD AT THE EXPLORATION DRILL RIG.

Workings at the site

  • Type of workings Surface
    Overall depth 121.92M
    Overall length 518.16M
    Overall width 381M

Comments on development

  • TOTAL$: 1
  • FREEDOM FLATS DEPOSIT DISCOVERED DURING A PEDIMENT DRILLING PROGRAM SOUTHWEST OF BOREALIS DEPOSIT. THE THIRD DRILL HOLE OF THE PROGRAM INTERSECTED THE MAIN HIGH-GRADE CORE. FREEDOM FLATS LIES ONLY 2000 FT. SOUTHWEST OF THE ORIGINAL BOREALIS DEPOSIT AND REMAINED UNDISCOVERED DESPITE SEVEN YEARS OF EXPLORATION IN THE DISTRICT. DRILLING PRIOR TO 1986 PROGRAM HAD DRILLED TO WITHIN 50 FT. OF SOUTHEASTERN EDGE OF FREEDOM FLATS, INTERSECTING THICK ALTERED INTERVALS BUT ONLY SCATTERED INTERVALS OF DETECTABLE GOLD. ; ECON.COM: OVERALL STRIPPING RATIO OF 9.8:1. CUT-OFF GRADE WAS 0.02 OPT GOLD.

Reference information

Bibliographic references

  • Deposit

    ENG, T. 1991, GEOLOGY OF THE FREEDOM FLATS GOLD DEPOSIT, BOREALIS MINE, MINERAL COUNTY, NEVADA, GSN 1990 SYMPOSIUM PROCEEDINGS, P. 995-1019.

  • Deposit

    NBMG, 1994, MI-1993

  • Production

    ENG, T., 1991, GEOLOGY AND MINERALIZATION OF THE FREEDOM FLATS GOLD DEPOSIT, BOREALIS MINE, MINERAL COUNTY, NEVADA, GSN 1990 SYMPOSIUM PROCEEDINGS, P. 995- 1019. NBMG MI-1993

General comments

Subject category Comment text
Deposit SURFACE PROJECTION OF DEPOSIT 1200 FT. BY 200-250 FT. MORE THAN 75% OF MINED OUNCES OF GOLD IN STEEPLY PLUNGING ZONE 400 FT. BY 150-200 FT. IN PLAN.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-OCT-1991 Phinisey, J. D. (Marcus, S.) U.S. Geological Survey
Updater 01-SEP-1994 Li, Zhiping (Moyer, Lorre A.) U.S. Geological Survey PARSED HOST ROCK AND ASSOCIATED ROCK INFORMATION FROM OLD SINGLE VALUED FIELD TO NEW MULTIVALUED FIELD
Editor 09-JUN-1995 Mosier, Dan 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.