Mine detail: Freedom Flats Deposit

Previously called 'Borealis Mine'

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Location

Lat / long:

38.37936, -118.76846

Resource(M)

Primary:	Gold, Silver
Secondary:	Antimony, Arsenic
Tertiary:	Zinc, Selenium, Copper, Lead, Mercury, Bismuth, Tellurium, Nickel
Ore:	Chalcocite, Cinnabar, Covellite, Enargite, Nagyagite, Niccolite, Pyrrhotite, Sphalerite
Discovery year:	1986

Production

Operation type:	Unknown
Production size:	Small
Development status:	Producer
Production years:	1986-1989
First production started:	1986
Last production ended:	1989

Geology

Host type:	Andesite
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 processes:	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.

References

MRDS	RE00018
DEP	10106950
Reference	{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}
Reporter	Phinisey, J. D. (Marcus, S.), Li, Zhiping (Moyer, Lorre A.), Mosier, Dan