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

ⓘ Andesite

Detailed Mineral List:

ⓘ Chalcocite

Formula: Cu₂S

References:

(2005) Mineral Resources Data System (MRDS), US Geological Survey.

ⓘ Cinnabar

Formula: HgS

References:

(2005) Mineral Resources Data System (MRDS), US Geological Survey.

ⓘ Clausthalite

Formula: PbSe

References:

Castor, Stephen B., Ferdock, Gregory C. (2004) Minerals of Nevada. Special Publication 31. Nevada Bureau of Mines and Geology

ⓘ Covellite

Formula: CuS

References:

(2005) Mineral Resources Data System (MRDS), US Geological Survey.

ⓘ Enargite

Formula: Cu₃AsS₄

References:

Castor, Stephen B., Ferdock, Gregory C. (2004) Minerals of Nevada. Special Publication 31. Nevada Bureau of Mines and Geology

(2005) Mineral Resources Data System (MRDS), US Geological Survey.

ⓘ Gold

Formula: Au

References:

Castor, Stephen B., Ferdock, Gregory C. (2004) Minerals of Nevada. Special Publication 31. Nevada Bureau of Mines and Geology

ⓘ Matildite

Formula: AgBiS₂

References:

Castor, Stephen B., Ferdock, Gregory C. (2004) Minerals of Nevada. Special Publication 31. Nevada Bureau of Mines and Geology

ⓘ Montroydite

Formula: HgO

References:

Castor, Stephen B., Ferdock, Gregory C. (2004) Minerals of Nevada. Special Publication 31. Nevada Bureau of Mines and Geology

ⓘ Nagyágite

Formula: [Pb₃(Pb,Sb)₃S₆](Au,Te)₃

References:

Castor, Stephen B., Ferdock, Gregory C. (2004) Minerals of Nevada. Special Publication 31. Nevada Bureau of Mines and Geology

(2005) Mineral Resources Data System (MRDS), US Geological Survey.

ⓘ Nickeline

Formula: NiAs

References:

Castor, Stephen B., Ferdock, Gregory C. (2004) Minerals of Nevada. Special Publication 31. Nevada Bureau of Mines and Geology

(2005) Mineral Resources Data System (MRDS), US Geological Survey.

ⓘ Pyrite

Formula: FeS₂

References:

Castor, Stephen B., Ferdock, Gregory C. (2004) Minerals of Nevada. Special Publication 31. Nevada Bureau of Mines and Geology

ⓘ Pyrrhotite

Formula: Fe_1-xS

References:

(2005) Mineral Resources Data System (MRDS), US Geological Survey.

ⓘ Quartz

Formula: SiO₂

References:

Castor, Stephen B., Ferdock, Gregory C. (2004) Minerals of Nevada. Special Publication 31. Nevada Bureau of Mines and Geology

ⓘ Sphalerite

Formula: ZnS

References:

(2005) Mineral Resources Data System (MRDS), US Geological Survey.

ⓘ Tiemannite

Formula: HgSe

References:

Castor, Stephen B., Ferdock, Gregory C. (2004) Minerals of Nevada. Special Publication 31. Nevada Bureau of Mines and Geology

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
ⓘ	Gold	1.AA.05	Au
Group 2 - Sulphides and Sulfosalts
ⓘ	Chalcocite	2.BA.05	Cu₂S
ⓘ	Covellite	2.CA.05a	CuS
ⓘ	Sphalerite	2.CB.05a	ZnS
ⓘ	Tiemannite	2.CB.05a	HgSe
ⓘ	Nickeline	2.CC.05	NiAs
ⓘ	Pyrrhotite	2.CC.10	Fe_1-xS
ⓘ	Clausthalite	2.CD.10	PbSe
ⓘ	Cinnabar	2.CD.15a	HgS
ⓘ	Pyrite	2.EB.05a	FeS₂
ⓘ	Nagyágite	2.HB.20a	[Pb₃(Pb,Sb)₃S₆](Au,Te)₃
ⓘ	Matildite	2.JA.20	AgBiS₂
ⓘ	Enargite	2.KA.05	Cu₃AsS₄
Group 4 - Oxides and Hydroxides
ⓘ	Montroydite	4.AC.15	HgO
ⓘ	Quartz	4.DA.05	SiO₂

List of minerals for each chemical element

O	Oxygen
O	ⓘ Montroydite	HgO
O	ⓘ Quartz	SiO₂
Si	Silicon
Si	ⓘ Quartz	SiO₂
S	Sulfur
S	ⓘ Chalcocite	Cu₂S
S	ⓘ Cinnabar	HgS
S	ⓘ Covellite	CuS
S	ⓘ Enargite	Cu₃AsS₄
S	ⓘ Matildite	AgBiS₂
S	ⓘ Nagyágite	[Pb₃(Pb,Sb)₃S₆](Au,Te)₃
S	ⓘ Pyrite	FeS₂
S	ⓘ Pyrrhotite	Fe_1-xS
S	ⓘ Sphalerite	ZnS
Fe	Iron
Fe	ⓘ Pyrite	FeS₂
Fe	ⓘ Pyrrhotite	Fe_1-xS
Ni	Nickel
Ni	ⓘ Nickeline	NiAs
Cu	Copper
Cu	ⓘ Chalcocite	Cu₂S
Cu	ⓘ Covellite	CuS
Cu	ⓘ Enargite	Cu₃AsS₄
Zn	Zinc
Zn	ⓘ Sphalerite	ZnS
As	Arsenic
As	ⓘ Enargite	Cu₃AsS₄
As	ⓘ Nickeline	NiAs
Se	Selenium
Se	ⓘ Clausthalite	PbSe
Se	ⓘ Tiemannite	HgSe
Ag	Silver
Ag	ⓘ Matildite	AgBiS₂
Sb	Antimony
Sb	ⓘ Nagyágite	[Pb₃(Pb,Sb)₃S₆](Au,Te)₃
Te	Tellurium
Te	ⓘ Nagyágite	[Pb₃(Pb,Sb)₃S₆](Au,Te)₃
Au	Gold
Au	ⓘ Gold	Au
Au	ⓘ Nagyágite	[Pb₃(Pb,Sb)₃S₆](Au,Te)₃
Hg	Mercury
Hg	ⓘ Cinnabar	HgS
Hg	ⓘ Montroydite	HgO
Hg	ⓘ Tiemannite	HgSe
Pb	Lead
Pb	ⓘ Clausthalite	PbSe
Pb	ⓘ Nagyágite	[Pb₃(Pb,Sb)₃S₆](Au,Te)₃
Bi	Bismuth
Bi	ⓘ Matildite	AgBiS₂

Other Databases

Link to USGS MRDS:	10106950

Other Regions, Features and Areas containing this locality

North America PlateTectonic Plate

Basin and Range BasinsBasin
Havallah BasinBasin
Shoofly-Olds Ferry DomainDomain
West Nevada Permian-Triassic BasinBasin

USA

Sierra NevadaMountain Range

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

Eng, T. (1991), Geology of the Freedom Flats Gold Deposit, Borealis Mine, Mineral County, Nevada, Gsn 1990 Symposium Proceedings, P. 995-1019.

NBMG, (1994), MI-1993

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