Nevada · Esmeralda County
Producer

Gemfield Gold Deposit

Esmeralda County, Nevada, United States
GoldSilverCopper
⌖ Show on mapUSGS source ↗
Commodities
PrimaryGold
SecondarySilver, Copper
Commodity typeM
Deposit
Deposit typesilicified zones at shear intersections
Model154: Epithermal quartz-alunite Au
Deposit sizeY
Orebody formIrregular to tabular or knobby
Ore controlThe ore-bearing structures are generally north-south trending and sub-parallel to the strike of the ring-fracture zone.\n
Materials
Ore mineralsGold
GangueQuartz, Alunite, Barite, Gypsum, Limonite, Kaolin
Geology
Host rockRhyolite · Sandstorm Rhyolite
StructureThe Gemfield Deposit is located to the west of the ring fracture zone that controls the main Goldfield deposits., Tertiary deposits are domed and faulted by steeply dipping post Miocene: N-S and E-W faults.
Tectonic settingvolcanic center, Basin and Range
AlterationLarge envelopes of intense argillic alteration surround most of the ore zones with silicification of core ore zones.
Economic & production
Development statusProducer
Production years1904-1970s
First production1904
Last production1970
Discovery year1902
Identification
Deposit ID10310419
MRDS IDW002900
RegionNA
Data scoreB
Coordinates37.71023, -117.23341
References
Ransome, F. L. 1909, Geol. and Ore Deposits of Goldfield, Nev.: USGS Prof. Paper 66, 258 p.Searls, F. Jr., 1948, Geol and Ore Deposits of Goldfield, Nev.: Nevada Univ. Bull., v.42, no. 5, Geology and Mining Ser. 48, 24 p.Koschmann, A. H. and Bergendahl, M. H., 1968; Principal Gold Producing Districts of the United States: USGS Prof. Paper 610Spurr, J E, 1905, The Ores of Goldfield, Nev.: USGS Bull. No. 260, p. 132-139.Lincoln, F C, 1923, Mining Dist and Min. Res. Nev.: Reno, Nev. Newsletter Pub., p. 67-73Albers, J.P. and Stewart, J.H., 1972, Geology and Mineral Deposits of Esmeralda County, Nevada: NBMG Bull. 78, p. 67-69Steven Ristorcelli, Scott Hardy, and Neil Prenn, 2003, Geology and Mineralization of the Goldfield Area, Esmeralda,County, Nevada; Geological Society of Nevada Special Publication No. 37: Spring 2003 Field Trip Guidebook Gold Deposits of the Goldfield, Midway and Thunder Mountain AreasInternet website for Metallic Ventures Inc.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.NBMG MI-80 through MI-99NBMG Map 91 1st, 2nd, 3rdMAS, 1984Amer. Mines (1990-2001)NBMG Bull 78www.romarco.comMetallic Ventures Inc., press releases 12/23/02.Metallic Ventures Gold Inc. Press Release: July 25, 2006