Freedom Flat deposit, Borealis mine, Borealis Mining District, Mineral County, Nevada, USAi
| Regional Level Types | |
|---|---|
| Freedom Flat deposit | Deposit |
| Borealis mine | Mine |
| Borealis Mining District | Mining District |
| Mineral County | County |
| Nevada | State |
| USA | Country |
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Latitude & Longitude (WGS84):
38° 22' 46'' North , 118° 46' 2'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Hawthorne | 3,269 (2017) | 20.4km |
| Walker Lake | 275 (2017) | 29.9km |
| Bridgeport | 575 (2011) | 42.7km |
| Mono City | 172 (2011) | 50.0km |
| Lee Vining | 222 (2011) | 56.2km |
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 ElementsCommodity 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 DiagramDetailed Mineral List:
| ⓘ Chalcocite Formula: Cu2S |
| ⓘ Cinnabar Formula: HgS |
| ⓘ Clausthalite Formula: PbSe |
| ⓘ Covellite Formula: CuS |
| ⓘ Enargite Formula: Cu3AsS4 |
| ⓘ Matildite Formula: AgBiS2 |
| ⓘ Montroydite Formula: HgO |
| ⓘ Nagyágite Formula: [Pb3(Pb,Sb)3S6](Au,Te)3 |
| ⓘ Native Gold Formula: Au |
| ⓘ Nickeline Formula: NiAs |
| ⓘ Pyrite Formula: FeS2 |
| ⓘ Pyrrhotite Formula: Fe1-xS |
| ⓘ Quartz Formula: SiO2 |
| ⓘ Sphalerite Formula: ZnS |
| ⓘ Tiemannite Formula: HgSe |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Native 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 | Fe1-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 | Fe1-xS |
| S | ⓘ Sphalerite | ZnS |
| Fe | Iron | |
| Fe | ⓘ Pyrite | FeS2 |
| Fe | ⓘ Pyrrhotite | Fe1-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 | ⓘ Native 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 AmericaContinent
North America PlateTectonic Plate
- Basin and Range BasinsBasin
- Havallah BasinBasin
- Northern Basin and RangeWide Rift
- Shoofly-Olds Ferry DomainDomain
- West Nevada Permian-Triassic BasinBasin
USA
- Sierra NevadaMountain Range
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