Metallic Mineral Resources in the U.S. Bureau of Land Management's Winnemucca District and Surprise Resource Area, Northwest Nevada and Northeast California; U.S. Geological Survey Open-File Report 96-712

USGS, 1996. CD-Rom in paper sleeve. very good. This report presents results of a study
conducted between 1992 and 1996 to assess the
undiscovered metallic mineral resources in the
U.S. Bureau of Land Management's (BLM)
Winnemucca District and Surprise Resource Area
(WSRA), northwest Nevada and northeast
California. A wide variety of mineral deposits are
present throughout the WSRA, and they are hosted
by rocks and surficial deposits ranging in age from
lower Paleozoic to Quaternary that is, from
approximately 570 million years (Ma) to about 1
Ma. The main metal commodities present in the
WSRA, from a commercial standpoint, are gold,
silver, and, to a lesser extent, tungsten. Gold
currently accounts for most mining activities in the
WSRA production of approximately 1.2 million
oz Au occurred from 10 mines during 1995. Eight
of these 10 mines also produced approximately 7.4
million oz Ag for a combined annual gross value of
approximately $550 million. Gold in the WSRA is
produced mostly from three types of deposits: (1)
sediment-hosted (Carlin-type) deposits, (2) hotspring and vein-type epithermal gold-silver
deposits, and (3) distal-disseminated silver-gold
deposits. Some additional gold and silver
production also is derived from a variety of less
important types of mineral deposits, including
minor production from placers.CD.