Green Springs Mine, White Pine Mining District, White Pine County, Nevada, USAi

Regional Level Types
Green Springs Mine	Mine
White Pine Mining District	Mining District
White Pine County	County
Nevada	State
USA	Country

Structure: North-Trending Folds. Green Springs Thrust Fault. 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.

Alteration: 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.

Commodity: Limonite, scorodite, stibiconite, barite, jarosite(?), pyrite, trace sphalerite and galena are recognized at green springs.

Deposit: 4 separate mineralized zones.

Deposit type: Carbonate-hosted Au-Ag

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 belo W 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$: 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.

Geology: Majority of ore hosted by lower limestone unit of chainman shale.

Rock formation(s): Chainman Shale


Ore(s): The North -Northeast Alignment Of Ore Zones Is Believed To Be Related To A Deep, Unrecognized "Feeder Fault", Perhaps One Coincident With The Synclinal Axis Just West Of The Ore Zones. This Is Conjectural As No Single Major Fault System Connecting The Individual Ore Shoots Has Been Identified.

Other Databases

Link to USGS MRDS:	10047582