Green Springs Mine

Site Name

Primary: Green Springs Mine
Secondary: C
Secondary: D
Secondary: And North C Orebodies

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Commodity

Primary: Gold
Secondary: Silver

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Location

State: Nevada
County: White Pine
District: White Pine District? (Closest)

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Land Status

Land ownership: BLM Administrative Area
Note: the land ownership field only identifies whether the area the mine is in is generally on public lands like Forest Service or BLM land, or if it is in an area that is generally private property. It does not definitively identify property status, nor does it indicate claim status or whether an area is open to prospecting. Always respect private property.

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Holdings

Not available

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Workings

Type: Surface

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Ownership

Owner Name: U.S. Minerals Exploration, Inc.

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Production

Year: 1990
Time Period: 1988-1990
Material type: ORE-AU
Description: Cp_Grade: ^2.1 Grams/Tonne

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Deposit

Record Type: Site
Operation Category: Producer
Operation Type: Unknown
Year First Production: 1988
Discovery Year: 1986
Years of Production:
Organization:
Significant: N
Deposit Size: S

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Physiography

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

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Mineral Deposit Model

Model Name: Carbonate-hosted Au-Ag

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Orebody

Not available

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Structure

Type: R
Description: North-Trending Folds. Green Springs Thrust Fault.

Type: L
Description: Three Prominent Sets Of Nearly Vertical Faults Have Been Mapped: North-Northeast, East-Northeast, And Northwest. The North-Northeast Set Parallels The Present Range Front, A Conspicuous Topographic Lineament Which Corresponds To The Main Ore Trend, The Major Fold Axes, And The Bonanza Silver Veins Of The Treasure Hill Mine. Norhteast- And Northwest- Striking Faults Are Both Pre- And Post-Ore. Offsets On These Faults Generally Measure Only A Few Meters.

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Alterations

Alteration Type: L
Alteration Text: Silicification And Argillization. Silicification In The Form Of Bedding- Controlled Jasperoids Is On A District Scale And Is Not A Guide To The Proximity Of Ore. Argillization Is Structurally Controlled And Is Widespread In Both Productive And Unmineralized Areas. Within The Ore Zones, Gold Grades Are Independent Of The Intensity Of Argillization. Argillization Is Comprised Of 7a-Halloysite, Kaolinite, And Sericite. Argillization Postdates Silicification.

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Rocks

Name: Limestone
Role: Host
Age Type: Host Rock Unit
Age Young: Mississippian

Name: Limestone
Role: Host
Age Type: Host Rock
Age Young: Mississippian

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Analytical Data

Not available

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Materials

Not available

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Comments

Comment (Reserve-Resource): RESERVES ARE POSSIBLY GREATER AS THERE 2 OTHER MINERALIZED AREAS NOT YET FULLY EXPLORED.

Comment (Production): RESERVES DEPLETED 6/90.

Comment (Commodity): LIMONITE, SCORODITE, STIBICONITE, BARITE, JAROSITE(?), PYRITE, TRACE SPHALERITE AND GALENA ARE RECOGNIZED AT GREEN SPRINGS.

Comment (Location): INFO FROM LAND.ST :(1972)

Comment (Development): CLAIMS STAKED IN 1979 BY USMX, COVERING A 4 KM LONG NORTH-TRENDING BAND OF JASPEROIDS. FROM 1980 TO 1986, THE PROPERTY WAS EXPLORED BY FIVE JOINT VENTURE PARTNERS USING THE PILOT FORMATION "ALLIGATOR RIDGE" DEPOSIT MODEL. APPROXIMATELY 75 HOLES WERE DRILLED DURING THIS PERIOD, IN ADDITION TO GEOLOGIC MAPPING (1:4800) AND GRID SOIL AND ROCK GEOCHEMISTRY. RESULTS WERE DISCOURAGING AND THE JOINT VENTURE WAS TERMINATED. IN 1986, USMX ELECTED TO EXPLORE THE PROPERTY WITHOUT JOINT VENTURE PARTNERS. THE PILOT FORMATION-HOSTED MODEL WAS ABANDONED IN FAVOR OF A CHAINMAN FORMATION-HOSTED MODEL. THE FOURTH HOLE OF THE JUNE, 1986 DRILLING PROGRAM INTERSECTED 21 METERS OF 1.9 GRAMS PER TON GOLD STARTING AT A DEPTH OF 3 METERS BELOW THE SURFACE. OVER THE NEXT 12 MONTHS, APPROXIMATELY 350 HOLES WERE DRILLED ON A 15 BY 30 METER GRID, WHICH DELINEATED TWO OREBODIES AND IDENTIFIED 3 OTHER MINERALIZED ZONES. THE MOST SUCCESSFUL EXPLORATION TOOL AT GREEN SPRINGS HAS BEEN GRID SOIL GEOCHEMISTRY. ; TOTAL$:

Comment (Geology): MAJORITY OF ORE HOSTED BY LOWER LIMESTONE UNIT OF CHAINMAN SHALE.

Comment (Development): 4.0 ; ECON.COM: STRIP RATIO OF 2.7:1. CUTOFF GRADE OF 0.7 GRAMS/TON. 80% RECOVERY USING HEAP LEACH TECHNOLOGY. DORE IS 84% AU, 14% AG. MINING COMPLETED 6/90; HEAP LEACHING CONTINUED THROUGH 1990 AND INTO 1991.

Comment (Deposit): 4 SEPARATE MINERALIZED ZONES.

Comment (Workings): 3 OPEN PITS, HEAP LEACH FACILITY ALL COVERING APPROXIMATELY 115 ACRES. THE DIMENSIONS GIVEN ABOVE ARE FOR THE C PIT, THE LARGEST AT GREEN SPRINGS.

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References

Reference (Deposit): WILSON, W.R., COX, J.W., LANCE, D.L., 1991, GEOLOGY AND GEOCHEMISTRY OF THE GREEN SPRINGS GOLD MINE, WHITE PINE COUNTY, NEVADA, IN RAINES, G.L., ET AL, EDS., GEOLOGY AND ORE DEPOSITS OF THE GREAT BASIN, THE GEOLOGICAL SOCIETY OF NEVADA, RENO, P. 687-700.

Reference (Deposit): NBMG, 1994, MI-1993

Reference (Production): WILSON, W.R., COX, J.W., LANCE, D.L., 1991, GEOLOGY AND GEOCHEMISTRY OF THE GREEN SPRINGS GOLD MINE, WHITE PINE COUNTY, NEVADA, IN RAINES, G.L., ET AL, EDS., GEOLOGY AND ORE DEPOSITS OF THE GREAT BASIN, THE GEOLOGICAL SOCIETY OF NEVADA, RENO, P. 687-700. NBMG, 1990, THE NEVADA MINERAL INDUSTRY 1990, NBMG SPECIAL PUBLICATION MI-1990, P. 25 NBMG MI-1993

Reference (Reserve-Resource): NBMG MI-1987

Reference (Deposit): NBMG MINING DISTRICT FILE 344, NUMEROUS PRESS CLIPPINGS.

Reference (Deposit): SCOPING DOCUMENT FOR US MINERALS EXPLORATION CO.'S PROPOSED GREEN SPRINGS MINE DEVELOPMENT, NBMG FILE WHITE PINE GENERAL, ITEM 63, 1987.

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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.