Mine detail: Mag Deposit

Previously called ''

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Location

Lat / long:

41.13878, -117.25235

Resource(B)

Primary:	Gold
Secondary:	Silver
Tertiary:	Mercury, Arsenic, Antimony, Tungsten, Thallium, Barium-Barite, Fluorine-Fluorite, Molybdenum, Nickel, Zinc, Cobalt, Lead
Gangue:	Barite, Bournonite, Chalcopyrite, Cinnabar, Copper, Covellite, Famatinite, Galena, Geocronite, Iron, Marcasite, Pyrite, Quartz, Realgar, Sphalerite, Stibnite
Orebody form:	TABULAR
Discovery year:	1984

Production

Operation type:	Unknown
Production size:	Small
Development status:	Producer
Production years:	1987 - PRESENT (12/91)
First production started:	1987

Geology

Host rock:	Comus Formation
Host type:	Argillite
Structure:	Two Orientations Of Extensional Faulting Are Recognized. The Dominant Trend Strikes N-S To N30w, Dips 40-65 East, And Mimics The Strike Of The Orebody. The Second Strikes N30-60e, Dips 50-65 Se, And Offsets Quaternary Alluvium.
Alteration processes:	Hypogene Decalcification, Leaching, Silicification, Kaolinization Are Spatially Associated With Ore. Supergene Weathering Of Pyrite To A Depth Of 200 Ft. Calcite Veining Common Only In Massive, Unmineralized Limestone. Jasperoids Formed Coeval With Au Deposition, But Botryoidal, Chalcedonic Silica Is Younger Than Au Deposition.

References

MRDS	RE00029
DEP	10055089
Reference	FOSTER, J.M., AND KRETSCHMER, E.L., 1991, GEOLOGY OF THE MAG DEPOSIT, PINSON MINE, HUMBOLDT COUNTY, NEVADA, IN RAINES, G.L., ET AL, EDS., GEOLOGY AND ORE DEPOSITS OF THE GREAT BASIN, THE GEOLOGICAL SOCIETY OF NEVADA, RENO, P. 845-856
Reporter	Phinisey, J. D. (Marcus, S.)