Mine detail: Northumberland Mine

Previously called 'Blue BellMonitorLast Chance GroupCyprus-Northumberland Mine'

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Location

Lat / long: 38.95826, -116.84675

Resource(B)

Primary: Gold, Silver
Secondary: Barium-Barite
Tertiary: Iron, Arsenic
Ore: Pyrargyrite, Cerargyrite, Arsenopyrite, Gold, Scorodite, Quartz, Sericite, Barite
Orebody form: tabular to irregular
Discovery year: 1866

Production

Operation type: Surface-Underground
Deposit type: vein, disseminated, epithermal
Production size: Medium
Development status: Producer
Production years: 1860s-1891 1939-1942 1981-1988
First production started: 1860
Last production ended: 1988

Geology

Host rock:Pogonip Group, Vinini Fm, Roberts Mountain Fm
Host type:Shale,Quartzite,Chert,Argillite,Limestone
Associated rock:Northumberland intrusive
Associated type:Quartz Monzonite,Porphyry
Structure:Major thrust sheets have affected the rocks. A Jurassic granodioritic stock has domed the country rocks., Silicified horizons of the Pogonip group rocks have been extensively fractured and microfractured.
Tectonic:Northumberland caldera ring fracture zone
Alteration processes:silicification, sericitization, jasperoid, argillization

References

MRDSM231715
DEP10310362
Reference{Deposit:: Kleinhampl, F.J. and Ziony, J.I., 1984, NBMG Bull 99-A and B.}{Deposit:: Kral, V. E., 1950, NBMG Bull 50.}{Deposit:: Unpublished notes, Nbmg mining district file 42, Item 2.}{Deposit:: Nevada Mining Association Newsletter, Oct., 1980.}{Deposit:: Field examination of the property, and discussion, L.J. Garside and H.F. Bonham, Jr.,NBMG, May, July, 1981.}{Deposit:: Smith, P. and Bentz, J., 1981, NBMG Field Examination.}{Deposit:: Tingley, J.V. and Quade, Jack, 1986, NBMG OFR 86-14.}{Deposit:: Goldstein, I.J., 1973, Gold Mineralization at the Northumberland Gold Mine, Nye Co., NV; GSA Abstr. Poster session}{Deposit:: McKee, E.H., 1974, NBMG Report 19}{Deposit:: Motter, J.W. and Chapman, P.E., 1984, AEG Field Trip Guidebook.}{Deposit:: Ott, L.E., 1983, Geol. and Mineralization at Northumberland Gold Mine, Nye Co. Nv; MS Thesis; Montana College of Mineral Science and Technology.}{Deposit:: NBMG MI-1987}{Deposit:: NBMG Mining District File 242, news Clippings.}{Deposit:: NBMG, MI-79 thru MI-84, MI-86 thru MI-03}{Deposit:: Long, K.R., DeYoung, J.H., Jr., and Ludington, S.D., 1998, Database of significant deposits of gold, silver, copper, lead, and zinc in the United States; Part A, Database description and analysis; part B, Digital database: U.S. Geological Survey Open-File Report 98-206, 33 p., one 3.5 inch diskette.}{Deposit:: NBMG Map 91, 1st, 2nd, 3rd.}{Deposit:: Amer. Mines (1989), 1989 thru Amer. Mines (2001), 2000}{Deposit:: websites - Newmont and NewWest Resources Group.}
ReporterLaPointe, D.D. , Schruben, Paul G.