Reona Pit, Battle Mountain Mining District, Lander County, Nevada, USAi

Regional Level Types
Reona Pit	Pit
Battle Mountain Mining District	Mining District
Lander County	County
Nevada	State
USA	Country

Structure: Golconda Thrust fault; Willow Creek Thrust fault Virgin Fault.

Alteration: All rocks have been affected to some degree by contact metamorphism from the associated graniitc intrusions. The Copper Canyon granodiorite

Tectonics: The Battle Mountain Mining District has been affected by two major thrust-faulting events: the Antler orogeny in late Devonian-early Mississippian, which emplaced rocks of the Roberts Mountain allochthon from the east, and the Golconda thrust during the Permo-Triassic Sonoma orogeny, which emplaced rocks from the west. An autochthonous block of rocks remains at the center of these tectonic events, and it contains the Penn-Perm Battle Formation, Antler Peak Limestone, and Edna Formation, which rocks often form the host rocks for mineralization in many of the Battle Mountain skarn deposits.

Commodity: Ore Materials: free gold

Deposit: The Bonanza and South Canyon deposits are hosted primarily in the Battle Formation with minor ore forming in the Harmony Formation. The Bonanza deposit is adjacent to the Virgin Fault. Ore at the Sunshine Deposit is hosted in a sheared contact zone between chert of the Lithotectonic Unit 1 (LU-1) of the Havallah Sequence and granodiorite of Copper Canyon. alternate deposit type: skarn gold

Deposit type: Distal disseminated Ag-Au

Development: Battle Mountain Gold Company announced the Reona project reserves in about 1993. Stripping of overburden at the Reona Project began in 1994 and the first gold pour was later that year. In 1994, it was reported that the Reona zone hosts 13.5 million tons of ore averaging 0.028 ounces of gold per ton. With a gold recovery of 70%, the mine was expected to yield a total of 260,000 ounces of gold Annual production was expected to reach 70,000 ounces in 1995. In 2004, Newmont reported that 2005 development work at their Phoenix Project would included developing the Reona Pit, expanding the Fortitude and Northeast Extension Pits to form the Phoenix Pit, and expanding the North Midas and South Midas Pits to form the Midas Pit. The Midas pit is in the immediate vicinity of the Bonanza and South Canyon deposits. Later it became incorporated into the greater Phoenix project of Newmont.

Ore(s): There is a combination of lithologic and structural control of the Reona Project orebodies. The Bonanza deposit is in calcareous sediments adjacent to the Virgin Fault. Ore at the Sunshine Deposit is hosted in a sheared contact zone between chert of the Lithotectonic Unit 1 (LU-1) of the Havallah Sequence and granodiorite of Copper Canyon.

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Link to USGS MRDS:	10310321

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References