LJ Ridge Deposit, Bald Mountain Mining District, White Pine County, Nevada, USAi
Regional Level Types | |
---|---|
LJ Ridge Deposit | Prospect |
Bald Mountain Mining District | Mining District |
White Pine County | County |
Nevada | State |
USA | Country |
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Latitude & Longitude (WGS84):
39° 57' 59'' North , 115° 35' 45'' West
Latitude & Longitude (decimal):
Type:
KΓΆppen climate type:
Nearest Settlements:
Place | Population | Distance |
---|---|---|
Eureka | 610 (2011) | 59.3km |
Mindat Locality ID:
438776
Long-form identifier:
mindat:1:2:438776:6
GUID (UUID V4):
d7a0f0fe-3b1b-4cc5-9717-2076291dc2f4
Other/historical names associated with this locality:
Bald Mountain Mine Project
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.
Alteration: Alteration consists predominantly of silicification, argillization, and potassic alteration.
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 Gangue Materials: quartz, pyrite, arsenopyrite, sericite, and small amounts of sphalerite, chalcopyrite, tetrahedrite and galena.
Deposit: The LJ Ridge deposit is located about a mile east of the Pits 1-5 deposits and about two miles northwest of the Top deposit area. Ore at LJ Ridge is hosted mainly by a north-south-trending structure 6 to 15 meters wide and to a lesser degree by favorable stratigraphic horizons in the Dunderberg Shale.
Deposit type: Distal disseminated Ag-Au
Development: Placer Dome began exploration on the Bald Mountain property in 1977. IN 1996, it was reported that the LJ Ridge deposit was the most recently discovered of the Bald Mountain district orebodies, after the No. 1-5, RBM, Rat, Top, Mahoney Canyon and Sage Flat deposits. Mining the LJ Ridge deposit was completed in 2000. In 2006, Barrick Gold Corp. acquired the LJ Ridge property through its acquisition of Placer Dome U. S., Inc.
Geology: Alteration comments: silicification, argillization, potassic alteration. The main alteration feature at Bald Mountain is the large halo of silicification and strong argillization. Potassic alteration is recognized at depth. Geology comments: Host rocks are calcareous shales and dark gray limestones which weather to iron-oxide stained red-brown-maroon and tan colors. Granitic intrusive with quartz phenocrysts and oxidized pyrite was noted in cut face of drill roads. Sulfur isotope studies indicate that ore fluids that formed the LJ Ridge deposit ere derived from the central part of the Bald Mountain stockigneous system.
Ore(s): Mineralization is structurally controlled. The dominant structural trend is N45W, but there are NE-, N-S, and E-W-trending structures as well. The E-W structures show the youngest period of movement, some of which is post-ore
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
8 valid minerals.
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 DiagramDetailed Mineral List:
β Arsenopyrite Formula: FeAsS |
β Chalcopyrite Formula: CuFeS2 |
β Galena Formula: PbS |
β Gold Formula: Au |
β Muscovite Formula: KAl2(AlSi3O10)(OH)2 |
β Muscovite var. Sericite Formula: KAl2(AlSi3O10)(OH)2 |
β Pyrite Formula: FeS2 |
β Quartz Formula: SiO2 |
β Sphalerite Formula: ZnS |
β 'Tetrahedrite Subgroup' Formula: Cu6(Cu4C2+2)Sb4S12S |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
Group 1 - Elements | |||
---|---|---|---|
β | Gold | 1.AA.05 | Au |
Group 2 - Sulphides and Sulfosalts | |||
β | Sphalerite | 2.CB.05a | ZnS |
β | Chalcopyrite | 2.CB.10a | CuFeS2 |
β | Galena | 2.CD.10 | PbS |
β | Pyrite | 2.EB.05a | FeS2 |
β | Arsenopyrite | 2.EB.20 | FeAsS |
β | 'Tetrahedrite Subgroup' | 2.GB.05 | Cu6(Cu4C2+2)Sb4S12S |
Group 4 - Oxides and Hydroxides | |||
β | Quartz | 4.DA.05 | SiO2 |
Group 9 - Silicates | |||
β | Muscovite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
β | var. Sericite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
List of minerals for each chemical element
H | Hydrogen | |
---|---|---|
H | β Muscovite | KAl2(AlSi3O10)(OH)2 |
H | β Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
O | Oxygen | |
O | β Muscovite | KAl2(AlSi3O10)(OH)2 |
O | β Quartz | SiO2 |
O | β Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
Al | Aluminium | |
Al | β Muscovite | KAl2(AlSi3O10)(OH)2 |
Al | β Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
Si | Silicon | |
Si | β Muscovite | KAl2(AlSi3O10)(OH)2 |
Si | β Quartz | SiO2 |
Si | β Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
S | Sulfur | |
S | β Arsenopyrite | FeAsS |
S | β Chalcopyrite | CuFeS2 |
S | β Galena | PbS |
S | β Pyrite | FeS2 |
S | β Sphalerite | ZnS |
S | β Tetrahedrite Subgroup | Cu6(Cu4C22+)Sb4S12S |
K | Potassium | |
K | β Muscovite | KAl2(AlSi3O10)(OH)2 |
K | β Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
Fe | Iron | |
Fe | β Arsenopyrite | FeAsS |
Fe | β Chalcopyrite | CuFeS2 |
Fe | β Pyrite | FeS2 |
Cu | Copper | |
Cu | β Chalcopyrite | CuFeS2 |
Cu | β Tetrahedrite Subgroup | Cu6(Cu4C22+)Sb4S12S |
Zn | Zinc | |
Zn | β Sphalerite | ZnS |
As | Arsenic | |
As | β Arsenopyrite | FeAsS |
Sb | Antimony | |
Sb | β Tetrahedrite Subgroup | Cu6(Cu4C22+)Sb4S12S |
Au | Gold | |
Au | β Gold | Au |
Pb | Lead | |
Pb | β Galena | PbS |
Other Databases
Link to USGS MRDS: | 10310447 |
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