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0361-0128/01/3475/1665-22 $6.00 1665 Introduction

Summary: 0361-0128/01/3475/1665-22 $6.00 1665
THE KEN SNYDER mine exploits the largest known Au-Ag ep-
ithermal deposit along the middle Miocene northern Nevada
rift. Located in the historic mining district of Midas, previ-
ously known as the Gold Circle district (LaPointe et al., 1991;
Fig. 1), the deposit consists of a complex of steeply dipping,
quartz-adularia-calcite-precious metal bonanza veins hosted
by volcanic rocks. The Ken Snyder deposit, known worldwide
as Midas, locally contains ore grades greater than 100 oz/t or
3,430 g/t of gold. Gold occurs as electrum and is intimately as-
sociated with selenide and sulfide minerals. Together, these
minerals form dark bands similar to the ginguro ore at
Hishikari (e.g., Izawa et al., 1990; Naito, 1993). Premining re-
serves at Midas were approximately 3 Moz of Au and 35 Moz
of Ag (0.25 oz/t or 8.5 g/t Au cutoff grade; R. Streiff, pers.
commun., 2003), with the bulk of the ore contained within
the Colorado Grande and Gold Crown veins. Exploration ef-
forts in the district are ongoing, and potential resources re-
main untested.


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


Collections: Geosciences