Unnamed Occurrence (ARDF - CR018), Klawock, Prince of Wales Island, Ketchikan Mining District, Prince of Wales-Hyder Census Area, Alaska, USAi
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Latitude & Longitude (WGS84):
55° 31' 40'' North , 133° 5' 26'' West
Latitude & Longitude (decimal):
Type:
KΓΆppen climate type:
Nearest Settlements:
Place | Population | Distance |
---|---|---|
Klawock | 765 (2017) | 2.7km |
Craig | 1,248 (2017) | 6.8km |
Hollis | 112 (2011) | 28.8km |
Naukati Bay | 113 (2015) | 38.9km |
Hydaburg | 391 (2017) | 39.3km |
Mindat Locality ID:
200633
Long-form identifier:
mindat:1:2:200633:1
GUID (UUID V4):
89d95d6a-b13b-4bce-aac8-210f885221cd
The Sealaska Corporation holds the subsurface rights to the land in the vicinity.
Location: This site represents an area of about one-quarter square mile about 1.8 mile south of the town of Klawock. The area covers most of the NW1/4 section 22, T. 73 S., R. 81 E., and the site is in the center of that area.
Geology: This site consists of several small occurrences of similar mineralization in an area of about a quarter square mile; the deposits are exposed along logging roads in an area that is largely covered by forest and surficial deposits. The rocks consist mainly of a thick section of Paleozoic strata (Churkin and Eberlein, 1975). They include the Klawak Formation of Pennsylvanian age, which consists largely of calcareous sandstone, siltstone, and limestone, and the Peratrovich Formation, which at this site consists largely of limestone and cherty limestone. Several deposits have been identified in the area, some perhaps the same deposit described by different geologists. D.J. Grybeck (unpublished field data, 1991) found pyritiferous sandstone of the Klawock Formation that was bleached and iron stained for about 40 feet along a logging road. The zone contains a lens about 12 inches thick of massive pyrrhotite with minor chalcopyrite and a silicified border zone. A sample of the massive pyrrhotite contained up to 300 parts per million (ppm) silver, 200 ppm arsenic, 150 ppm bismuth, and 3,000 ppm copper Erratic, small patches of calc-silicate minerals with garnet and small, rusty gossan zones occur along the logging road for several hundred yards to the northwest. A grab sample of one of the more prominent gossans contained 7 ppm silver and 700 ppm copper. Hedderly-Smith (1999 [Inventory]) describes several other (or the same) occurrences that were found in 1988 as logging roads were built in the area. Two 1.5-foot-thick stratiform veins or replacement lenses of massive pyrrhotite are separated by 6 feet of ferricrete. Samples contained up to 0.3 percent copper, 1,270 ppm lead, and 3.12 ounces of silver per ton. The deposit strikes about N20E and dips 60W. About 10 feet south of the pyrrhotite lenses, minor galena occurs in a quartz-sulfide vein. About 0.1 mile northwest near a rock pit, samples of mineralized float contained more than 1 percent lead, 1.2 percent zinc, and more than 50 ppm silver. Another sample of chert-carbonate rock adjacent to a felsic dike contained 656 ppm lead, 454 ppm copper, 6.2 ppm silver, 4.66 percent manganese, 16.94 percent iron, 1.38 percent arsenic, and 271 parts per billion gold. Hedderly-Smith indicates that these deposits were first thought to be massive-sulfide deposits but later concluded that they are skarn deposits. There are no intrusions in the immediate area but there may be buried or concealed bodies similar to Permian syenite exposed about a mile to the north that may be the source of these deposits (Churkin and Eberlein, 1975).
Workings: Only sampling by government and industry geologists.
Age: Unclear. These small and erratically distributed deposits are no older than their Mississippian and Pennsylvanian host rocks. There are no intrusions in the immediate area but there may be buried or concealed bodies similar to the Permian syenite exposed about a mile to the north that may be the source of these deposits (Churkin and Eberlein, 1975).
Alteration: Small lenses and masses of skarn developed in limestone; silicification adjacent to pyrrhotite lens; disseminated pyrite in calcareous sandstone.
Commodities (Major) - Ag, As, Au, Bi, Cu, Mn, Pb
Development Status: None
Deposit Model: Small erratic veins, pyrrhotite lenses, and quartz veins.
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
5 valid minerals.
Detailed Mineral List:
β Chalcopyrite Formula: CuFeS2 |
β Epidote Formula: (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
β Galena Formula: PbS |
β 'Garnet Group' Formula: X3Z2(SiO4)3 |
β Pyrrhotite Formula: Fe1-xS |
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 | Pyrrhotite | 2.CC.10 | Fe1-xS |
β | Galena | 2.CD.10 | PbS |
Group 4 - Oxides and Hydroxides | |||
β | Quartz | 4.DA.05 | SiO2 |
Group 9 - Silicates | |||
β | Epidote | 9.BG.05a | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
Unclassified | |||
β | 'Garnet Group' | - | X3Z2(SiO4)3 |
List of minerals for each chemical element
H | Hydrogen | |
---|---|---|
H | β Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
O | Oxygen | |
O | β Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
O | β Quartz | SiO2 |
O | β Garnet Group | X3Z2(SiO4)3 |
Al | Aluminium | |
Al | β Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
Si | Silicon | |
Si | β Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
Si | β Quartz | SiO2 |
Si | β Garnet Group | X3Z2(SiO4)3 |
S | Sulfur | |
S | β Chalcopyrite | CuFeS2 |
S | β Galena | PbS |
S | β Pyrrhotite | Fe1-xS |
Ca | Calcium | |
Ca | β Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
Fe | Iron | |
Fe | β Chalcopyrite | CuFeS2 |
Fe | β Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
Fe | β Pyrrhotite | Fe1-xS |
Cu | Copper | |
Cu | β Chalcopyrite | CuFeS2 |
Pb | Lead | |
Pb | β Galena | PbS |
Other Databases
Link to USGS - Alaska: | CR018 |
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Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Alexander DomainDomain
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