Casino prospect, Bald Mountain Mining District, White Pine County, Nevada, USAi
Regional Level Types | |
---|---|
Casino prospect | Prospect |
Bald Mountain Mining District | Mining District |
White Pine County | County |
Nevada | State |
USA | Country |
This page is currently not sponsored. Click here to sponsor this page.
Latitude & Longitude (WGS84):
39° 58' 5'' North , 115° 30' 55'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
Place | Population | Distance |
---|---|---|
Eureka | 610 (2011) | 63.3km |
Mindat Locality ID:
203969
Long-form identifier:
mindat:1:2:203969:8
GUID (UUID V4):
32f9aff6-1896-4492-a5ff-0a9de5885a19
Other/historical names associated with this locality:
Keno Pit
Structure: The Bald Mountain district is located in an area of thinned crust along the eastern side of the Late Proterozoic rift that split the North American craton. It is also in the west-central portion of the Late Devonian-Early Mississippian Antler foreland basin, and near the eastern edge of deformation related to the late Paleozoic Humboldt orogeny To the west of the Bald Mountain district, geologic interpretations are dominated by recognition of Paleozoic deformation, whereas to the east, interpretations emphasize Mesozoic contraction and plutonism and Tertiary extension. The Casino pit contains one moderately dipping normal fault as well as multiple high- and low-angle faults. At Casino, northeast structures are present, accompanied by north- and west-trending structures. The Keno fault zone is a moderately dipping normal-fault zone in siltstone and silty limestone with 55-100 m of dip-slip displacement. The fault changes character along strike from a single clay-rich slip plane 10-20 mm thick at the northern exposure in the pit to numerous hydrocarbon-bearing, calcite-filled, nearly vertical slip planes in a zone 15 m wide at the southern exposure. The hanging wall and footwall are intensely fractured but fracture densities do not vary markedly with distance from the fault.
Alteration: Alteration at the Casino Deposit includes decalcification, pervasive silicification, and argillization. Silicification and the formation of jasperoid are the dominant alteration types.
Tectonics: The Bald Mountain district is located in an area of thinned crust along the eastern side of the Late Proterozoic rift that split the North American craton. It is also in the west-central portion of the Late Devonian-Early Mississippian Antler foreland basin, and near the eastern edge of deformation related to the late Paleozoic Humboldt orogeny.
Commodity: Ore Materials: gold
Deposit: Host rocks for the deposit are Late Paleozoic sedimentary rocks. In the Casino area, unaltered Oligocene volcanic rocks rest on massive jasperoid. The Casino deposit is localized along the edge of a fold.
Deposit type: Sediment-hosted Au
Development: Development in the northeastern part of the district began in 1987. The ARM Joint Venture (Amselco with, at different times, Occidental Petroleum, Nerco, Kennecott) began relinquishing claim groups north of Alligator Ridge Mine that were originally staked as part of an agreement with Lyle Campbell. Campbell retained and maintained the claim groups and, in November 1987, leased the Casino-Winrock area of claims to the USMX-Pegasus Joint Venture. Casino produced from 1990-1992, operated by a joint venture between USMX (51%) and Pegasus Gold Inc. (49%) Gold recovery was anticipated to be 80% using heap leach technology. Life of mine strip ratio was 3.8:1. In 2006, Barrick Gold Corp. acquired the Casino Mine property through its acquisition of Placer Dome U. S., Inc.
Ore(s): The Casino deposit is localized along the edge of a fold. Whole-rock major, minor, and trace element analyses indicate that Au, Sb, and As are in general associated with the Keno fault zone, suggesting that Au- and silica-bearing fluids migrated along the fault to replace carbonate in the footwall and adjacent hanging wall rocks.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsCommodity List
This is a list of exploitable or exploited mineral commodities recorded at this locality.Mineral List
1 valid mineral.
Rock Types Recorded
Note: data is currently VERY limited. Please bear with us while we work towards adding this information!
Select Rock List Type
Alphabetical List Tree DiagramGallery:
Other Databases
Link to USGS MRDS: | 10310390 |
---|
Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Antler Foreland BasinBasin
- Basin and Range BasinsBasin
- Copper–Bull Run–Elko–Indian Wells BasinBasin
- Mojave DomainDomain
This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to
visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders
for access and that you are aware of all safety precautions necessary.