Commodities
PrimaryGold
SecondarySilver
Commodity typeM
Deposit
Deposit typePluton-related skarn gold
Model75: Distal disseminated Ag-Au
Deposit sizeN
Ore controlThe distribution of mineralized rocks suggests partial control of Au deposition by a north-south pre-mineral structure on the east side of the Redline porphyry stock.
Materials
Ore mineralsGold, Chalcopyrite, Pyrite, Molybdenite
GanguePyrrhotite
Geology
Host rockSandstone,Siltstone · Havallah Sequence
Associated rockPorphyry,Granodiorite · Redline porphyry stock
StructureThe deposit area is underlain by the regionally extensive Mississippian, Pennsylvanian, and Permian Havallah sequence, which comprises the upper plate of the Golconda thrust, a regional structure dating from the late Permian-early Triassic Sonoma orogeny.The Golconda thrust is exposed intermittently along the east side of the Havallah Hills and west flank of Battle Mountain 4.5 miles east of Converse/Redline. \n\n, Several thrusts separate various time-stratigraphic rock units within the Havallah sequence. The deposit has also been affected by a set of high angle northwest-striking faults of Mesozoic age; a prominent set of north-striking early Tertiary faults; and east-striking and northeast-striking faults, some with movement as recent as late Miocene and younger.
Tectonic settingTertiary basin
AlterationAlteration assemblages include pyroxene hornfels, pyroxene>garnet skarn, biotite hornfels, and quartz hornfels, with a retrograde overprint of amphibole, epidote, chlorite, calcite, quartz and sulfide minerals. Biotite and quartz hornfels are early in the alteration sequence and are overprinted by the much more abundant pyroxene hornfels. Light green to grass green diopsidic pyroxene is the dominant hornfels mineral. Pyroxene-garnet skarn replaces hornfels but is greatly subordinate to hornfels in volume; skarn pyroxene is dark green and hedenbergitic
Economic & production
Development statusPast Producer
Discovery year1995
Identification
Deposit ID10310472
Alternate namesConverse Gold property, Nike
RegionNA
Data scoreB
Coordinates40.70288, -117.26682
References
Northern Miner, 8/11/97Romarco Minerals In Company news release, 7/20/98Denver Mining Record, 8/5/98Long, K.R., DeYoung, J.H., Jr., and Ludington, S.D., 1998, Significant deposits of gold, silver, copper, lead, and zinc in the United States: U.S. Geological Survey Open-File Report 90-206A, 33 p.; 98-206B. one 3.5 inch diskette.Cleveland, Gaylord, 2000, Geology of the Redline gold skarn deposits, Converse Project, Humboldt County, Nevada, in Cluer, J.K., Price, J.G., Struhsacker, E.M., Hardyman, R.F., and Morris, C.L., eds., Geology and Ore Deposits 2000: The Great Basin and Beyond: Geological Society of Nevada Symposium Proceedings, May 15-18, 2000, p. 1047-1068.