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Paper No. 23-5 Presentation Time: 8:30 AM-5:30 PM VOLCANO-TECTONIC SETTING OF THE MIDAS EPITHERMAL VEIN
 

Summary: Paper No. 23-5 Presentation Time: 8:30 AM-5:30 PM VOLCANO-TECTONIC
SETTING OF THE MIDAS EPITHERMAL VEIN
DEPOSIT, ELKO COUNTY, NEVADA LEAVITT, Ellie1
, SPELL,
T.L.2
, WALLACE, Alan R.3
, GOLDSTRAND, Patrick4
, and AREHART, Greg B.1
, (1)
Department of Geology, Univ of Nevada Reno, MS 172, Reno, NV 89557-0001,
Leavitt@unr.nevada.edu, (2) Department of Geology, Univ of Nevada, Las Vegas, NV, (3) US
Geol Survey, MS 176, Univ. Nevada, Reno, Reno, NV 89557-0047, (4) Bureau of Mining
Regulation and Reclamation, 333 W. Nye Lane, Carson City, NV 98706
The Ken Snyder mine hosts the largest known high-grade Au-Ag vein deposit associated with
the northern Nevada rift (NNR). The deposit consists of a complex of steeply dipping quartz-
adularia-calcite-precious metal bonanza veins hosted by volcanic rocks. It belongs to a suite of
middle Miocene low-sulfidation, precious metal-rich epithermal systems that formed in syn-
volcanic faults during continental extension. The Midas hydrothermal system is hosted by a
bimodal assemblage of felsic and mafic volcanic rocks and overlain by unaltered ash-flow tuffs.
At 15.6 Ma, volcanism in the Midas area shifted from bimodal magmatism and basin formation

  

Source: Arehart, Greg B. - Department of Geological Sciences, Mackay School of Mines, University of Nevada, Reno

 

Collections: Geosciences