Unnamed Prospects (ARDF - KC148), Blunt Mountain, Annette Island, Ketchikan Mining District, Prince of Wales-Hyder Census Area, Alaska, USAi
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Latitude & Longitude (WGS84):
55° 7' 40'' North , 131° 22' 26'' West
Latitude & Longitude (decimal):
KΓΆppen climate type:
Nearest Settlements:
Place | Population | Distance |
---|---|---|
Metlakatla | 1,405 (2017) | 12.8km |
Saxman | 417 (2017) | 25.4km |
Ketchikan | 8,197 (2017) | 29.4km |
Mindat Locality ID:
202526
Long-form identifier:
mindat:1:2:202526:4
GUID (UUID V4):
4385c021-96f4-45fb-9146-c605c85e6a68
Location: This site represents a line of old prospects between 200 and 800 feet elevation near the southeast foot of Blunt Mountain, and 1.0-1.5 miles southeast of the highest point on the mountain. The prospects are in sections 2 and 3, T. 78 S., R. 93 E., of the Copper River Meridian. The coordinates are for the approximate center of the half-mile-long line of prospects. The site corresponds to locs. 1 and 2 in Berg (1972 [I 684]), loc. 145 in Elliott and others (1978), and locs. 30a-d and 31 in Karl (1992). The location is accurate within about 0.1 mile.
Geology: The country rocks in the area of this site are recrystallized, Upper Triassic carbonate and clastic rocks, rhyolite, and basalt (Berg, 1972). The rocks are complexly folded and faulted, and were regionally metamorphosed to greenschist-grade phyllite and semischist in Late Cretaceous time. All of the mineral deposits are hosted by metarhyolite and tuff. The deposits consist of sparsely mineralized, sulfide-bearing, locally vuggy quartz veins up to 3 feet thick, in sheared, sericitized, and chloritized rhyolite and tuff (Berg, 1972, locs. 1, 2; Karl, 1992, locs. 30, 31). Some of the mineralized shear zones are up to 10 feet wide and have been traced on the surface for 40 feet. The chief sulfide mineral is pyrite, which also is sparsely disseminated in the altered rhyolite adjacent to the veins. Other sulfide minerals, inferred from sample assays, probably include galena, chalcopyrite, sphalerite, and barite. Minor hematite is reported in some of the veins. The deposits were explored in the 1930s by a 110-foot-long, NE-trending adit, and in the 1970s by trenches, shallow pits, and soil surveys (Berg, 1972; Karl, 1992). Selected samples of mineralized quartz veins and stringers collected by the USGS in the 1930s contained up to 0.05 oz. Au/ton, 20.60 oz. Ag/ton, 4.63% Cu, 9.75% Pb, and 13.14% Zn (Berg, 1972. loc. 1). Samples of variously mineralized quartz veins and of altered rhyolite collected by the USGS in the early 1990s contained as much as 2.68 oz. Au/ton, 8.75 oz. Ag/ton, 200 ppm Cu, 1000 ppm Pb, 200 ppm Zn, and more than 5000 ppm Ba (Karl, 1992, locs. 30a, 31). A limonitic quartz vein sampled in the 1970s by private interests contained 0.93 oz. Au/ton; and soil samples that they collected contained up to 0.9 ppm Au (Karl, 1992, loc. 30c).
Workings: The deposits were explored in the 1930s by a 110-foot-long, NE-trending adit, and in the 1970s by trenches, shallow pits, and soil surveys (Berg, 1972; Karl, 1992). Selected samples of mineralized quartz veins and stringers collected by the USGS in the 1930s contained up to 0.05 oz. Au/ton, 20.60 oz. Ag/ton, 4.63% Cu, 9.75% Pb, and 13.14% Zn (Berg, 1972. loc. 1). Samples of variously mineralized quartz veins and of altered rhyolite collected by the USGS in the early 1990s contained as much as 2.68 oz. Au/ton, 8.75 oz. Ag/ton, 200 ppm Cu, 1000 ppm Pb, 200 ppm Zn, and more than 5000 ppm Ba (Karl, 1992, locs. 30a, 31). A limonitic quartz vein sampled in the 1970s by private interests contained 0.93 oz. Au/ton; and soil samples that they collected contained up to 0.9 ppm Au (Karl, 1992, loc. 30c).
Age: Probably Late Cretaceous or younger.
Alteration: Rhyolite is sericitized and pyritic in shear zones and adjacent to quartz veins.
Commodities (Major) - Ag, Au, Cu, Pb, Zn; (Minor) - Barite
Development Status: None
Deposit Model: Polymetallic veins (Cox and Singer, 1986; model 22c)
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
6 valid minerals.
Detailed Mineral List:
β Baryte Formula: BaSO4 |
β Chalcopyrite Formula: CuFeS2 |
β Galena Formula: PbS |
β Hematite Formula: Fe2O3 |
β Pyrite Formula: FeS2 |
β Quartz Formula: SiO2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
Group 2 - Sulphides and Sulfosalts | |||
---|---|---|---|
β | Chalcopyrite | 2.CB.10a | CuFeS2 |
β | Galena | 2.CD.10 | PbS |
β | Pyrite | 2.EB.05a | FeS2 |
Group 4 - Oxides and Hydroxides | |||
β | Hematite | 4.CB.05 | Fe2O3 |
β | Quartz | 4.DA.05 | SiO2 |
Group 7 - Sulphates, Chromates, Molybdates and Tungstates | |||
β | Baryte | 7.AD.35 | BaSO4 |
List of minerals for each chemical element
O | Oxygen | |
---|---|---|
O | β Baryte | BaSO4 |
O | β Hematite | Fe2O3 |
O | β Quartz | SiO2 |
Si | Silicon | |
Si | β Quartz | SiO2 |
S | Sulfur | |
S | β Baryte | BaSO4 |
S | β Chalcopyrite | CuFeS2 |
S | β Galena | PbS |
S | β Pyrite | FeS2 |
Fe | Iron | |
Fe | β Chalcopyrite | CuFeS2 |
Fe | β Hematite | Fe2O3 |
Fe | β Pyrite | FeS2 |
Cu | Copper | |
Cu | β Chalcopyrite | CuFeS2 |
Ba | Barium | |
Ba | β Baryte | BaSO4 |
Pb | Lead | |
Pb | β Galena | PbS |
Other Databases
Link to USGS - Alaska: | KC148 |
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