Mag Deposit

The Mag Deposit is a gold mine located in Humboldt county, Nevada at an elevation of 5,000 feet.

About the MRDS Data:

All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.

Mine Info

Satelite View

MRDS mine locations are often very general, and in some cases are incorrect. Some mine remains have been covered or removed by modern industrial activity or by development of things like housing. The satellite view offers a quick glimpse as to whether the MRDS location corresponds to visible mine remains.

Site Name

Primary: Mag Deposit

Commodity

Primary: Gold
Secondary: Silver
Tertiary: Mercury
Tertiary: Arsenic
Tertiary: Antimony
Tertiary: Tungsten
Tertiary: Thallium
Tertiary: Barium-Barite
Tertiary: Fluorine-Fluorite
Tertiary: Molybdenum
Tertiary: Nickel
Tertiary: Zinc
Tertiary: Cobalt
Tertiary: Lead

Location

State: Nevada
County: Humboldt
District: Potosi District; Getchell Trend

Land Status

Not available

Holdings

Not available

Workings

Type: Surface

Ownership

Owner Name: Pinson Mining Co.
Home Office: P.O. Box 192, Winnemucca, Nv 89445

Production

Not available

Deposit

Record Type: Site
Operation Category: Producer
Operation Type: Unknown
Year First Production: 1987
Discovery Year: 1984
Years of Production:
Organization:
Significant: N
Deposit Size: S

Physiography

General Physiographic Area: Intermontane Plateaus
Physiographic Province: Basin And Range Province
Physiographic Section: Great Basin
Physiographic Detail: Basin &Mountains

Mineral Deposit Model

Model Name: Carbonate-hosted Au-Ag

Orebody

Form: TABULAR

Structure

Type: L
Description: 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.

Alterations

Alteration Type: L
Alteration Text: 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.

Rocks

Name: Argillite
Role: Host
Age Type: Host Rock Unit
Age Young: Late Ordovician

Name: Argillite
Role: Host
Age Type: Host Rock
Age Young: Late Ordovician

Analytical Data

Not available

Materials

Gangue: Pyrite
Gangue: Stibnite
Gangue: Galena
Gangue: Chalcopyrite
Gangue: Quartz
Gangue: Iron
Gangue: Covellite
Gangue: Bournonite
Gangue: Famatinite
Gangue: Copper
Gangue: Marcasite
Gangue: Cinnabar
Gangue: Realgar
Gangue: Geocronite
Gangue: Barite
Gangue: Sphalerite

Comments

Comment (Location): EAST FLANK OF OSGOOD MTNS.

Comment (Commodity): AU CORRELATES STRONGLY WITH HG, TL, AND AS. AU CORRELATES WEAKLY WITH BA, ZN, AND F. AU DOES NOT CORRELATE WITH CO, CU, MO, NI, PB.

Comment (Reserve-Resource): FIGURES REPRESENT PRE-MINING RESERVE ESTIMATES USING OVERALL STRIP RATIO OF 4:1. MILL CUTOFF GRADE IS 0.046 OPT AU. HEAP LEACH CUTOFF GRADE IS 0.020 OPT AU.

Comment (Development): THE DEPOSIT WAS CONCEALED BY ALLUVIUM. IN 1971, A SOIL SAMPLING SURVEY DETECTED ELEVATED HG OVER MAG, BUT MAGNETIC AND VLF-EM SURVEYS GAVE UNCLEAR RESULTS. TWO HOLES WERE DRILLED NEAR MAG IN 1972 AS STEPOUTS ALONG STRIKE FROM THE PINSON A OREBODY. ONE OF THESE HOLES INTERSECTED MINOR AU MINERALIZATION. ADDITIONAL DRILLING IN THE 1970'S WAS COMPLETED FOR CLAIM ASSESSMENTS. IN 1978, ONE OF THESE HOLES INTERSECTED SIGNIFICANT LOW GRADE AU, BUT WAS NOT CONSIDERED ADEQUATE FOR IMMEDIATE FOLLOW-UP DRILLING. IN MAY, 1984, STEPOUT DRILLING DISCOVERED THE MAG DEPOSIT ALONG THE PINSON TREND AT THE INTERSECTION WITH N-NW STRIKING CARBONATE ROCKS. ; ECON.COM: MILL USES CARBON-IN-PULP PROCESS AT A RATE OF 1500 TONS PER DAY. MILL RECOVERIES OF 88% IN 1989; RECOVERIES WILL DECLINE AS CARBONACEOUS AND SULFIDE-BEARING ORE IS ENCOUNTERED WITH DEPTH.

Comment (Deposit): DEPOSIT THICKENS FROM 200 FT. IN NORTH-NORTHWEST TO 400 FT. IN SOUTH-SOUTHEAST.

Comment (Workings): FIGURES ABOVE ARE FOR AUGUST, 1989. WHEN COMPLETED IN 1998, PIT WILL BE 3200 FT. LONG, 1200 FT. WIDE, 500 FT. DEEP.

References

Reference (Deposit): 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

Nevada Gold

Nevada has a total of 368 distinct gold districts. Of the of those, just 36 are major producers with production and/or reserves of over 1,000,000 ounces, 49 have production and/or reserves of over 100,000 ounces, with the rest having less than 100,000 ounces. Read more: Gold Districts of Nevada.