Mine detail: Mason Valley Mine

Previously called ''

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Location

Lat / long:

38.9488, -119.22181

Resource(B)

Primary:	Copper
Secondary:	Gold, Silver
Tertiary:	Gypsum-Anhydrite, Iron
Ore:	Chalcocite, Chalcopyrite, Malachite
Gangue:	Calcite, Chlorite, Garnet
Orebody form:	IRREGULAR LENSES
Discovery year:	1865

Production

Operation type:	Unknown
Deposit type:	Sedimentary
Production size:	Large
Development status:	Past Producer
First production started:	1870

Geology

Host type:	Limestone
Associated rock:	Yerington Batholith;Yerington Batholith
Associated type:	Rhyolite
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 processes:	Albitic, Sericitic, Propylitic, Weak Potassic, Oxidation

References

MRDS	M035865
DEP	10103617
Reference	{Deposit:: KNOPF, A., 1918 , GEOLOGY AND MINERAL DEPOSITS OF THE YERINGTON DISTRICT, NEV., USGS PROF. PAPER NO. 114 .}{Deposit:: ARCHBOLD, N. L., 1969 , GEOLOGY AND MINERAL DEPOSITS OF LYON, DOUGLAS, ORMSBY CO, NEV., NEV. BUREAU OF MINES, BULL. 75 .}{Deposit:: RANSOM, F. L., 1910 , MINING AND SCIENTIFIC PRESS.}{Deposit:: EINAUDI, M. T., 1977 , PETROGENISIS OF THE CU-BEARING SKARN AT THE MASON VALLEY MINE, YERINGTON DIST., NEV., ECONOMIC GEOLOGY, VOL. 72 NO. 5 .}{Deposit:: 1910 RECON RANSOME, F. L., MINING AND SCIENTIFIC PRESS}{Deposit:: 1918 GEOLMAP KNOPF, A. PROF. PAPER NO. 114}{Deposit:: 1969 RECON NEV. BUREAU OF MINES, BULL. 75}{Deposit:: 1977 RECON EINAUD, M. T., STANFORD GEOLOGICAL SURVEY, ECON. GEOL. VOL. 72 , NO. 5 .}{Production:: COUCH, CARPENTER, 1943 , NEV. METAL AND MINERAL PRODUCTION, UNIV. OF NEV. BULL., VOL. 27 , NO. 4}
Reporter	Fiebelkorn, J. B. (Stewart, J. H.)