Unnamed Occurrences (ARDF - KC167), Bush Mountain, Annette Island, Ketchikan Mining District, Prince of Wales-Hyder Census Area, Alaska, USAi
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Latitude & Longitude (WGS84):
55° 13' 1'' North , 131° 31' 8'' West
Latitude & Longitude (decimal):
Köppen climate type:
Nearest Settlements:
Place | Population | Distance |
---|---|---|
Metlakatla | 1,405 (2017) | 10.5km |
Saxman | 417 (2017) | 12.3km |
Ketchikan | 8,197 (2017) | 16.1km |
Mindat Locality ID:
202002
Long-form identifier:
mindat:1:2:202002:3
GUID (UUID V4):
725518c2-189f-4ff1-9fac-3140e6e2904a
Location: This site represents four occurrences in a mile-long, northwest-trending line extending from about 500 feet elevation near the northwest shore of Helen Todd Lake, to about 1100 feet elevation on the southwest ridge of Bush Mountain. The occurrences are in sections 2, 3, and 11, T. 77 S., R. 92 E., of the Copper River Meridian. The map site is at the approximate center of the line of occurrences. The site corresponds to loc. 12a-d in Karl (1992). The location is accurate within about 0.1 mile.
Geology: The country rocks in the area of this site include: undivided, metamorphosed Silurian and Ordovician volcanic, sedimentary, and intrusive rocks; Silurian trondhjemite; recrystallized, Upper Triassic sedimentary and volcanic rocks; and Upper Jurassic or Cretaceous flyschlike metasedimentary rocks and metavolcanic rocks (Berg, 1972 [I 684]; Berg and others, 1988; Karl, 1992). The rocks were regionally metamorphosed to greenschist-grade phyllite and semischist in Late Cretaceous time. The mineral occurrences consist of sheared, pyritic greenstone and microgabbro containing quartz and calcite veins (Karl, 1992, loc. 12a-d). Some of the quartz veins contain pyrite, pyrrhotite, chalcopyrite, and bornite. Some of the veins are cataclastic, and the microgabbro is propylitically altered to epidote, chlorite, quartz, calcite, and sericite. A sample of greenstone containing calcite-pyrrhotite veins assayed 500 ppm Cr and 1000 ppm Ni. Samples of greenstone, a quartz-sulfide vein, and quartz-albite-pyrite breccia contained up to 3.25 ppm Au, 70 ppm Ag, 15000 ppm Cu, 500 ppm Pb, and 10 ppm Mo. A sample of microgabbro contained 500 ppm Cr and 200 ppm Ni; samples of greenstone and quartz breccia contained up to 3 ppm Ag and 700 ppm Cu (Karl, 1992, loc. 12a-d).
Workings: A sample of greenstone containing calcite-pyrrhotite veins assayed 500 ppm Cr and 1000 ppm Ni. Samples of greenstone, a quartz-sulfide vein, and quartz-albite-pyrite breccia contained up to 3.25 ppm Au, 70 ppm Ag, 15000 ppm Cu, 500 ppm Pb, and 10 ppm Mo. A sample of microgabbro contained 500 ppm Cr and 200 ppm Ni; samples of greenstone and quartz breccia contained up to 3 ppm Ag and 700 ppm Cu (Karl, 1992, loc. 12a-d).
Age: Probably Late Cretaceous or younger.
Alteration: Country rocks are propylitized and pyritic.
Commodities (Major) - Ag, Au, Cr, Cu, Mo, Ni, Pb
Development Status: None
Deposit Model: Low-sulfide Au-quartz veins (Cox and Singer, 1986; model 36a)
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
7 valid minerals.
Detailed Mineral List:
ⓘ Albite Formula: Na(AlSi3O8) |
ⓘ Bornite Formula: Cu5FeS4 |
ⓘ Calcite Formula: CaCO3 |
ⓘ Chalcopyrite Formula: CuFeS2 |
ⓘ Pyrite Formula: FeS2 |
ⓘ Pyrrhotite Formula: Fe1-xS |
ⓘ Quartz Formula: SiO2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
Group 2 - Sulphides and Sulfosalts | |||
---|---|---|---|
ⓘ | Bornite | 2.BA.15 | Cu5FeS4 |
ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
ⓘ | Pyrrhotite | 2.CC.10 | Fe1-xS |
ⓘ | Pyrite | 2.EB.05a | FeS2 |
Group 4 - Oxides and Hydroxides | |||
ⓘ | Quartz | 4.DA.05 | SiO2 |
Group 5 - Nitrates and Carbonates | |||
ⓘ | Calcite | 5.AB.05 | CaCO3 |
Group 9 - Silicates | |||
ⓘ | Albite | 9.FA.35 | Na(AlSi3O8) |
List of minerals for each chemical element
C | Carbon | |
---|---|---|
C | ⓘ Calcite | CaCO3 |
O | Oxygen | |
O | ⓘ Albite | Na(AlSi3O8) |
O | ⓘ Calcite | CaCO3 |
O | ⓘ Quartz | SiO2 |
Na | Sodium | |
Na | ⓘ Albite | Na(AlSi3O8) |
Al | Aluminium | |
Al | ⓘ Albite | Na(AlSi3O8) |
Si | Silicon | |
Si | ⓘ Albite | Na(AlSi3O8) |
Si | ⓘ Quartz | SiO2 |
S | Sulfur | |
S | ⓘ Bornite | Cu5FeS4 |
S | ⓘ Chalcopyrite | CuFeS2 |
S | ⓘ Pyrite | FeS2 |
S | ⓘ Pyrrhotite | Fe1-xS |
Ca | Calcium | |
Ca | ⓘ Calcite | CaCO3 |
Fe | Iron | |
Fe | ⓘ Bornite | Cu5FeS4 |
Fe | ⓘ Chalcopyrite | CuFeS2 |
Fe | ⓘ Pyrite | FeS2 |
Fe | ⓘ Pyrrhotite | Fe1-xS |
Cu | Copper | |
Cu | ⓘ Bornite | Cu5FeS4 |
Cu | ⓘ Chalcopyrite | CuFeS2 |
Other Databases
Link to USGS - Alaska: | KC167 |
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