Mine detail: Emigrant Deposit

Previously called 'Emigrant Springs Deposit'

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Location

Lat / long: 40.61741, -115.97341

Resource(B)

Primary: Gold
Tertiary: Arsenic, Antimony, Barium-Barite
Ore: Gold
Gangue: Barite, Alunite, Jarosite, Kaolinite, Limonite
Orebody form: stratiform
Discovery year: 1981

Production

Operation type: Surface
Deposit type: Replacement; sediment-hosted Au
Production size: None
Development status: Prospect

Geology

Host rock:Devils Gate Limestone, Webb Formation, Chainman Formation
Host type:Limestone,Mudstone,Sandstone,Quartzite
Associated type:Monzonite
Structure:The Emigrant Springs fault is filled with jasperoidal breccia over a 50-foot width for 2200 feet along strike. The sense of movement on the fault is reverse., The property lies just beyond the easternmost limit of the Roberts Mountains Thrust. Emigrant Springs occurs on the NW limb of the Pinon Range anticline.
Alteration processes:The north-trending Emigrant fault zone hosts the Emigrant Springs deposit in mudstone of the Webb Formation along the contact of the Devils Gate Limestone. The Emigrant Springs fault is highly silicified with minor barite, alunite, jarosite, and kaolinite. The bedding parallel jasperoid which constitutes the ore zone is typically massive, waxy, tan to maroon, and fine-grained. Liesegang banding of unsilicified Webb Formation rocks above the jasperoid is common.

References

MRDSRE00037
DEP10310411
Reference{Deposit:: NBMG MI-88 thru MI-02}{Deposit:: NBMG Bull. 106}{Deposit:: Elko Land Status Map 1978}{Deposit:: Amer. Mines (1996), 1995}{Deposit:: Thompson, 1999}{Deposit:: Newmont Ann. Rept. 1988}{Deposit:: Jackson, P., 1992, Geology and mineralization of the Emigrant Springs Project, Elko County, Nevada, in Buffa, R. and Coyner, A., eds., The Geology and Ore Deposits of the Great Basin-Field Trip Guidebook Compendium, The Geological Society of Nevada, Reno, p. 125-130.}{Deposit:: Thoreson, R., 1991, Geology and gold deposits of the Rain subdistrict, Elko County, Nevada, in Raines, G.L., et al., eds., Geology and Ore Deposits of the Great Basin, The Geological Society of Nevada, Reno, p. 635-643.}{Deposit:: Thoreson, R., 1990, Geology and Ore Deposits of the Rain Subdistrict, Elko County, Nevada, Oral Presentation at Great Basin Symposium, The Geological Society of Nevada, Reno/Sparks, April 4.}{Deposit:: Nevada Dept.of Minerals, 1994}{Deposit:: Newmont Gold 1993 Sec Form 10k;}{Deposit:: Jackson, 1991}{Deposit:: Long, K.R., DeYoung, J.H., Jr., and Ludington, S.D., 1998, Significant deposits of gold, silver, copper, lead, and zinc in the United States: U.S. Geological Survey Open-File Report 90-206A, 33 p.; 98-206B. one 3.5 inch diskette.}{Deposit:: Adella Harding, Elko Daily Free Press, 10/4/02.}{Deposit:: Newmont 5-Year Business Plan Update (September 24, 2003) ? Supplemental Information.}{Deposit:: Anthony A. Longo, Tommy B. Thompson, and J. Bruce Harlan, 2002, Geologic Overview of the Rain Subdistrict, in NBMG Bull 111.}
ReporterPhinisey, J. D. (Marcus, S.), Li, Zhiping (Moyer, Lorre A.), LaPointe, D.D., Schruben, Paul G.