Commodities
PrimarySilver, Gold
TertiaryAntimony, Arsenic, Fluorine-Fluorite
Commodity typeB
Deposit
Deposit typelode, replacement\n
Model150: Epithermal vein, Comstock
Deposit sizeS
Orebody formTabular to irregular
Ore controlOre in the West Pit orebody follows faults parallel to the NW-trending Little Grey Fault with size and frequency of ore decreasing laterally away from the Little Grey Fault. The East Pit orebody is controlled by a poorly-defined NW-trending zone of abundant folds and associated faults associated with the axis of what is termed the ?Big Four Fold?.
Materials
Ore mineralsGold, Silver, Stibnite, Arsenopyrite, Realgar, Fluorite, Quartz, Adularia, Pyrite, Clay, Barite
GangueCalcite
Geology
Host rockPhyllite,Limestone · "Gold Hill Formation", "White Caps Limestone"
Associated rockSchist,Quartzite · Gold Hill Formation
StructureA series of thrust sheets that generally dip to the south have affected rocks in the mine area. The Manhattan gold deposit occurs within a NW-trending, NW-plunging faulted antiform., Reilly Fault (ENE), Jumping Jack Fault (NE), Twin Faults (ENE), Big Pine Fault (ENE), and joints associated with the Brugher Fault trend (NE), joints associated with the Little Grey Fault trend (NW), Little Grey Cross Fault (E-W) and joints associated with other unnamed fault trends, all cut through the mine area.
Tectonic settingBasin and Range province
AlterationHost rocks in the mine area are not strongly altered hydrothermally. Quartz/host rock contacts are sharply defined.
Economic & production
Development statusPast Producer
Production years1860s; 1905-1947; 1973-1993
First production1868
Last production1993
Discovery year1868
Identification
Deposit ID10310361
Alternate namesBig Four Mine, Reilly Mine, Big Pine Mine, Little Grey Mine, East Pit, West Pit
RegionNA
Data scoreA
Coordinates38.53132, -117.0562
References
Kral, V.E., 1951, Mineral Resources of Nye Co.: Nev. Bur. of Mines and Geol., Bull. 50, p. 125Ferguson, H.G., 1924, Geol. and ore deposits of the Manhattan District: USGS Bull 723, p. 151-153.NBMG, MI-1993-MI-2004.Shawe and others, 1986, Ages of igneous and hydrothermal events in the Round Mountain and Manhattan gold district, Nye County, Nevada, Econ. Geol., vol. 81, p. 388-407.Maddry and others, 1987, Geology of the Manhattan Gold deposit Nye County, Nevada, in Bulk Mineable Precious Metal Deposits of the Western US, GSN Symposium Proceedings.Long, K.R., DeYoung, J.H., Jr., and Ludington, S.D., 1998, Database of significant deposits of gold, silver, copper, lead, and zinc in the United States; Part A, Database description and analysis; part B, Digital database: U.S. Geological Survey Open-File Report 98-206, 33 p., one 3.5 inch diskette.