Mine detail: Dee Gold Mine

Previously called 'Boulder Creek MineMain ZoneRidge ZoneNorth ExtensionDeep NorthDx ZoneSouth ExtensionStorm decline'

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Location

Lat / long:

41.0324, -116.4276

Resource(B)

Primary:	Gold, Silver
Tertiary:	Antimony, Arsenic, Mercury, Thallium, Barium-Barite
Ore:	Gold, Pyrite, Barite
Gangue:	Stibnite
Orebody form:	tabular to irregular
Discovery year:	1980

Production

Operation type:	Surface
Deposit type:	disseminated gold
Production size:	Small
Development status:	Producer
Production years:	1984-2001
First production started:	1984
Last production ended:	2001

Geology

Host rock:	Vinini Formation, Bootstrap Limestone, Carlin Formation
Host type:	Sedimentary Rock,Carbonate
Associated type:	Tuff,Dacite
Structure:	The mine area has been affected by folding, thrusting, and high angle faulting. At least three stages of folding are recognized: 1) the oldest set trending N-NE, 2) a set trending N-NW with steep, south-dipping axial planes, 3) a set trending E-W, representing south-directed compression. Two stages of thrusting are represented. Both strike-slip and dip-slip movements are recognized on the high angle structures, but dip-slip movement dominates. NE-trending Basin and Range faults cut both Paleozoic and Tertiary units and displace ore horizons downwards on the southerly and westerly blocks. A few joints trending NE have chalcedonic silica developed along the fracture surfaces., Greybeck (1985) proposes that Dee is located at the leading edge of the Golconda Thrust and that beds exposed in the Dee Mine pit lie on the west flank of a close to tight NNE trending antiform.
Alteration processes:	Silicification and argillization of originally calcareous siltstones and limestones are the dominant alteration effects. Where mineralized, intrusive dikes of intermediate composition are sericitized and often silicified.

References

MRDS	M242256
DEP	10310338
Reference	{Deposit:: Geological Society of Nevada, Reno, p. 841-843.}{Deposit:: Abbott, E., Laux, D., Keith, S., 1992, Geochemistry and Ore Deposits - Influence of Magma Chemistry, In Buffa, R. And Coyner, A., eds., Geology and Ore Deposits of the Great Basin - Field Trip Guidebook Compendium, The Geological Society of Nevada, Reno, p. 568.}{Deposit:: Bergwall, F., 1992, Geology of the Dee Gold Mine, in Buffa, R. And Coyner, A., Eds., Geology and Ore Deposits of The Great Basin - Field Trip Guidebook Compendium, The Geological Society of Nevada, Reno, p. 867.}{Deposit:: Mining Journal/Montagu Mining Finance, Mining Database, 8/10/91.}{Deposit:: Bagby, W.C., Pickthorn, W.J., And Goldfarb, R.J., 1985, Pathfinder Elements in Soils over the Dee Disseminated Gold Deposit, Elko County, Nevada, in Krafft, K., ed., USGS Research on Mineral Resources-1985, Program and Abstracts, USGS Circular 949, p.1.}{Deposit:: Greybeck, J.D., 1985, Geology of the Dee Mine Area, Elko County, Nevada, Unpublished M.S. Thesis, University of Idaho.}{Deposit:: Jones, R., 1989, Carlin Trend Gold Belt: The Geology, Mining Magazine, Vol. 161, No. 4, P. 256-261.}{Deposit:: Thorstad, L., 1989, Carlin Trend Gold Belt: The Producers, Mining Magazine, Vol. 161, No. 4, P. 263-267.}{Deposit:: Ellis, R., 1987, The Dee Gold Mine, Geological Society of Nevada 1987 Fall Field Trip Guidebook, Special Publication No. 6, p. B23-B26.}{Deposit:: NBMG, 1991-2002, The Nevada Mineral Industry 1990-2001, NBMG Special Publication MI-1990-MI-2002.}{Deposit:: NBMG, 1994, MI-1993}{Deposit:: Nevada Division of Minerals,1994.}{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.}
Reporter	LaPointe, D.D., Schruben, Paul G.