Unnamed Prospect (ARDF - HE096; west of Anderson Mountain), Bonnifield Mining District, Denali Borough, Alaska, USAi
Regional Level Types | |
---|---|
Unnamed Prospect (ARDF - HE096; west of Anderson Mountain) | - not defined - |
Bonnifield Mining District | Mining District |
Denali Borough | Borough |
Alaska | State |
USA | Country |
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Latitude & Longitude (WGS84):
63° 48' North , 147° 57' West
Latitude & Longitude (decimal):
KΓΆppen climate type:
Mindat Locality ID:
202156
Long-form identifier:
mindat:1:2:202156:3
GUID (UUID V4):
63862d6b-e73c-423a-8655-dae1f871e361
High geochemical values of arsenic, antimony, mercury, and tungsten may be derived from older schist basement. Anderson Mountain is significantly different from prospects in the Totatlanika Schist belt to the north (e.g. HE122) in having higher Cu content.
Location: The prospect is located about 0.5 mile west of the summit of Anderson Mountain at an elevation of 4,500 to 5,500 feet. It is in sec. 9, T. 13 S., R. 2 W., of the Fairbanks Meridian. The location is accurate to within one mile. This is locality 12 of Cox and others (1989).
Geology: The prospect is in the Upper Devonian(?) felsic metavolcanic schist and phyllite, often containing relict phenocrysts of quartz, orthoclase, and plagioclase (Wilson and others, 1998). The deposit consists of massive layers of chalcopyrite, galena, sphalerite, enargite, and arsenopyrite in gangue of quartz, sericite, chlorite, calcite, barite, and siderite. The sulfide beds appear to lie on an irregular paleosurface on the footwall, with domal sulfide accumulations at the tops of layers (Nokleberg and others, 1994). The Hines Creek fault, a major structure that is responsible for much structural complexity at Anderson Mountain, is two miles south of the prospect. Numerous high-angle faults displace the sulfide layers, and folding makes tracing the layers a challenge. The discovery drill hole in 1976 intersected a massive sulfide zone that measured 1.7 meters thick and assayed 1.2% copper, 2% lead, 8.5% zinc and 61.4 grams of silver per ton (Schuster, 1998). Surface grab samples reportedly contain 14% combined lead and zinc, 2.5% copper and 274 grams of silver per ton. Nokleberg and others (1994) report copper grades varying from 0.5 to 19%, lead grades up to 5%, up to 22% zinc and up to 170 grams of silver per ton.
Workings: Geophysical and geochemical surveys have defined a potential zone of volcanogenic massive sulfide mineralization stretching over a strike length of 1373 meters. There has been about 2500 meters of drilling at the prospect (Robertson, 1998). The discovery drill hole in 1976 intersected a massive sulfide zone that measured 1.7 meters thick and assayed 1.2% copper, 2% lead, 8.5% zinc and 61.4 grams of silver per ton (Schuster, 1998). Surface grab samples reportedly contain 14% combined lead and zinc, 2.5% copper and 274 grams of silver per ton. Nokleberg and others (1994) report copper grades varying from 0.5 to 19%, lead grades up to 5%, up to 22% zinc and up to 170 grams of silver per ton.
Age: Mineralization was probably syngenetic with the Upper Devonian(?) host rocks.
Alteration: Absence of footwall alteration and stringer mineralization suggests off-vent deposition.
Commodities (Major) - Ag, Cu, Pb, Zn
Development Status: None
Deposit Model: Kuroko massive sulfide (Cox and Singer, 1986; model 28a)
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
10 valid minerals.
Detailed Mineral List:
β Arsenopyrite Formula: FeAsS |
β Baryte Formula: BaSO4 |
β Calcite Formula: CaCO3 |
β Chalcopyrite Formula: CuFeS2 |
β 'Chlorite Group' |
β Enargite Formula: Cu3AsS4 |
β Galena Formula: PbS |
β Muscovite Formula: KAl2(AlSi3O10)(OH)2 |
β Muscovite var. Sericite Formula: KAl2(AlSi3O10)(OH)2 |
β Quartz Formula: SiO2 |
β Siderite Formula: FeCO3 |
β Sphalerite Formula: ZnS |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
Group 2 - Sulphides and Sulfosalts | |||
---|---|---|---|
β | Sphalerite | 2.CB.05a | ZnS |
β | Chalcopyrite | 2.CB.10a | CuFeS2 |
β | Galena | 2.CD.10 | PbS |
β | Arsenopyrite | 2.EB.20 | FeAsS |
β | Enargite | 2.KA.05 | Cu3AsS4 |
Group 4 - Oxides and Hydroxides | |||
β | Quartz | 4.DA.05 | SiO2 |
Group 5 - Nitrates and Carbonates | |||
β | Calcite | 5.AB.05 | CaCO3 |
β | Siderite | 5.AB.05 | FeCO3 |
Group 7 - Sulphates, Chromates, Molybdates and Tungstates | |||
β | Baryte | 7.AD.35 | BaSO4 |
Group 9 - Silicates | |||
β | Muscovite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
β | var. Sericite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
Unclassified | |||
β | 'Chlorite Group' | - |
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 |
C | Carbon | |
C | β Calcite | CaCO3 |
C | β Siderite | FeCO3 |
O | Oxygen | |
O | β Baryte | BaSO4 |
O | β Calcite | CaCO3 |
O | β Muscovite | KAl2(AlSi3O10)(OH)2 |
O | β Quartz | SiO2 |
O | β Siderite | FeCO3 |
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 Baryte | BaSO4 |
S | β Chalcopyrite | CuFeS2 |
S | β Enargite | Cu3AsS4 |
S | β Galena | PbS |
S | β Sphalerite | ZnS |
K | Potassium | |
K | β Muscovite | KAl2(AlSi3O10)(OH)2 |
K | β Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
Ca | Calcium | |
Ca | β Calcite | CaCO3 |
Fe | Iron | |
Fe | β Arsenopyrite | FeAsS |
Fe | β Chalcopyrite | CuFeS2 |
Fe | β Siderite | FeCO3 |
Cu | Copper | |
Cu | β Chalcopyrite | CuFeS2 |
Cu | β Enargite | Cu3AsS4 |
Zn | Zinc | |
Zn | β Sphalerite | ZnS |
As | Arsenic | |
As | β Arsenopyrite | FeAsS |
As | β Enargite | Cu3AsS4 |
Ba | Barium | |
Ba | β Baryte | BaSO4 |
Pb | Lead | |
Pb | β Galena | PbS |
Other Databases
Link to USGS - Alaska: | HE096 |
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Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
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