Mason Valley Mine, Yerington, Yerington Mining District, Singatse Range, Lyon County, Nevada, USAi

Regional Level Types
Mason Valley Mine	Mine
Yerington	City
Yerington Mining District	Mining District
Singatse Range	Mountain Range
Lyon County	County
Nevada	State
USA	Country

A copper mine that worked on a copper-bearing skarn.
Structure: Yerington Batholith Responsible For Dist. Of Metasomatic Rocks And Zoning Of Mineral Assemblages. Qtz. Monzonite Porphyry Dike Swarms Within Central Portion Of Batholith Formed Porphyry Cu Deposits Series Of Faults And Cross-Faults Adding Considerable Complexity To Profound Metamorphism

Alteration: Albitic, Sericitic, Propylitic, Weak Potassic, Oxidation

Deposit: Contact metasomatic aureole deposit and some degree of fissure veining. Skarn outcrop: for 600 m along lmst./tuff contact. Ave. Width 45 m in northern one-half and 0 to 15 m in the south. It dips 70 degrees west, parallel to bedding mine idle during 1915 - 16 . Prior to this mine produced 600 tons/day to smelter ; info.src : 1 pub lit discovery year: 1860's

Deposit type: Skarn Cu

Development: Econ.com: aerial tramway, electric haulage

Geology: Barren lime-silicate rocks highly garnetiferous. Multi-pulse intrusives. Two state metasomatism. mineral zonation from center line of alteration envelope: (1) garnet-pyroxene, (2) pyroxene, (3) marble contact zones. Dominant direction of flow of metasomatic fluid was southward, away from the northern batholith contact along brecciated contacts, bedding planes and fractures. Skarn formation occurred at a depth of 2,000 m. Little or no brecciation.

Rock formation(s): Yerington Batholith;Yerington Batholith


Ore(s): Garnetized Shear Zone Between A Footwall Of Felsite Tuff Breccia And Andesite And A Hanging Wall Of Limestone

Other Databases

Link to USGS MRDS:	10103617

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References