Description
Tenneco Minerals
Commodities
PrimaryGold, Silver
SecondaryAntimony, Arsenic
TertiaryZinc, Selenium, Copper, Lead, Mercury, Bismuth, Tellurium, Nickel
Commodity typeM
Deposit
Model154: Epithermal quartz-alunite Au
Deposit sizeS
WorkingsSurface
Ore controlBoth 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.
Materials
Ore mineralsChalcocite, Cinnabar, Covellite, Enargite, Nagyagite, Niccolite, Pyrrhotite, Sphalerite
Geology
Host rockAndesite
StructureWalker 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.
AlterationSilicification, 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.
Economic & production
Development statusProducer
Production years1986-1989
First production1986
Last production1989
Discovery year1986
Identification
Deposit ID10106950
MRDS IDRE00018
Alternate namesBorealis Mine
RegionNA
Data scoreB
Coordinates38.37936, -118.76846
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-1993ENG, 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