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Freedom Flat deposit, Borealis mine, Borealis Mining District, Mineral County, Nevada, USAi
Regional Level Types
Freedom Flat depositDeposit
Borealis mineMine
Borealis Mining DistrictMining District
Mineral CountyCounty
NevadaState
USACountry

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PhotosMapsSearch
Latitude & Longitude (WGS84):
38° 22' 46'' North , 118° 46' 2'' West
Latitude & Longitude (decimal):
Type:
Nearest Settlements:
PlacePopulationDistance
Hawthorne3,269 (2017)20.4km
Walker Lake275 (2017)29.9km
Bridgeport575 (2011)42.7km
Mono City172 (2011)50.0km
Lee Vining222 (2011)56.2km
Mindat Locality ID:
63549
Long-form identifier:
mindat:1:2:63549:2
GUID (UUID V4):
ff805a35-0df9-4273-a3c5-682bdd33cff9


Structure: Walker Lane Structural Zone. 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.

Alteration: 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.

Commodity: 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.

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.

Deposit type: Epithermal quartz-alunite Au

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.

Ore(s): 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.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


15 valid minerals.

Rock Types Recorded

Note: data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

β“˜ Chalcocite
Formula: Cu2S
β“˜ Cinnabar
Formula: HgS
β“˜ Clausthalite
Formula: PbSe
β“˜ Covellite
Formula: CuS
β“˜ Enargite
Formula: Cu3AsS4
β“˜ Gold
Formula: Au
β“˜ Matildite
Formula: AgBiS2
β“˜ Montroydite
Formula: HgO
β“˜ NagyΓ‘gite
Formula: [Pb3(Pb,Sb)3S6](Au,Te)3
β“˜ Nickeline
Formula: NiAs
β“˜ Pyrite
Formula: FeS2
β“˜ Pyrrhotite
Formula: Fe1-xS
β“˜ Quartz
Formula: SiO2
β“˜ Sphalerite
Formula: ZnS
β“˜ Tiemannite
Formula: HgSe

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
β“˜Gold1.AA.05Au
Group 2 - Sulphides and Sulfosalts
β“˜Chalcocite2.BA.05Cu2S
β“˜Covellite2.CA.05aCuS
β“˜Sphalerite2.CB.05aZnS
β“˜Tiemannite2.CB.05aHgSe
β“˜Nickeline2.CC.05NiAs
β“˜Pyrrhotite2.CC.10Fe1-xS
β“˜Clausthalite2.CD.10PbSe
β“˜Cinnabar2.CD.15aHgS
β“˜Pyrite2.EB.05aFeS2
β“˜NagyΓ‘gite2.HB.20a[Pb3(Pb,Sb)3S6](Au,Te)3
β“˜Matildite2.JA.20AgBiS2
β“˜Enargite2.KA.05Cu3AsS4
Group 4 - Oxides and Hydroxides
β“˜Montroydite4.AC.15HgO
β“˜Quartz4.DA.05SiO2

List of minerals for each chemical element

OOxygen
Oβ“˜ MontroyditeHgO
Oβ“˜ QuartzSiO2
SiSilicon
Siβ“˜ QuartzSiO2
SSulfur
Sβ“˜ ChalcociteCu2S
Sβ“˜ CinnabarHgS
Sβ“˜ CovelliteCuS
Sβ“˜ EnargiteCu3AsS4
Sβ“˜ MatilditeAgBiS2
Sβ“˜ NagyΓ‘gite[Pb3(Pb,Sb)3S6](Au,Te)3
Sβ“˜ PyriteFeS2
Sβ“˜ PyrrhotiteFe1-xS
Sβ“˜ SphaleriteZnS
FeIron
Feβ“˜ PyriteFeS2
Feβ“˜ PyrrhotiteFe1-xS
NiNickel
Niβ“˜ NickelineNiAs
CuCopper
Cuβ“˜ ChalcociteCu2S
Cuβ“˜ CovelliteCuS
Cuβ“˜ EnargiteCu3AsS4
ZnZinc
Znβ“˜ SphaleriteZnS
AsArsenic
Asβ“˜ EnargiteCu3AsS4
Asβ“˜ NickelineNiAs
SeSelenium
Seβ“˜ ClausthalitePbSe
Seβ“˜ TiemanniteHgSe
AgSilver
Agβ“˜ MatilditeAgBiS2
SbAntimony
Sbβ“˜ NagyΓ‘gite[Pb3(Pb,Sb)3S6](Au,Te)3
TeTellurium
Teβ“˜ NagyΓ‘gite[Pb3(Pb,Sb)3S6](Au,Te)3
AuGold
Auβ“˜ GoldAu
Auβ“˜ NagyΓ‘gite[Pb3(Pb,Sb)3S6](Au,Te)3
HgMercury
Hgβ“˜ CinnabarHgS
Hgβ“˜ MontroyditeHgO
Hgβ“˜ TiemanniteHgSe
PbLead
Pbβ“˜ ClausthalitePbSe
Pbβ“˜ NagyΓ‘gite[Pb3(Pb,Sb)3S6](Au,Te)3
BiBismuth
Biβ“˜ MatilditeAgBiS2

Other Databases

Link to USGS MRDS:10106950

Other Regions, Features and Areas containing this locality


This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

 
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