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Unnamed Occurrence (ARDF - CR175), Dora Lake, Prince of Wales Island, Ketchikan Mining District, Prince of Wales-Hyder Census Area, Alaska, USAi
Regional Level Types
Unnamed Occurrence (ARDF - CR175)- not defined -
Dora LakeLake
Prince of Wales IslandIsland
Ketchikan Mining DistrictMining District
Prince of Wales-Hyder Census AreaCensus Area
AlaskaState
USACountry

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PhotosMapsSearch
Latitude & Longitude (WGS84):
55° 9' 18'' North , 132° 15' 0'' West
Latitude & Longitude (decimal):
Köppen climate type:
Nearest Settlements:
PlacePopulationDistance
Hollis112 (2011)50.9km
Mindat Locality ID:
200657
Long-form identifier:
mindat:1:2:200657:7
GUID (UUID V4):
9ea81742-29f6-459b-95e1-9606ba2c61c0


Location: This occurrence is in a borrow pit about 0.4 mile west-southwest of the southern tip of Dora Lake; it is about 0.6 mile northeast of the center of section 35, T. 77 S., R. 87 E.
Geology: In a borrow pit at this site, Maas and others (1991) identified mineralization similar to that at the Lucky Boy Mine (CR174), about 0.5 mile to the east. The pit exposes calcareous metasedimentary rocks and greenstone that contain stratiform quartz-calcite-sulfide veins and stringers. On older maps, these rocks were considered to be part of the Wales Group of Late Proterozoic and Cambrian age (Eberlein and others, 1983; Brew, 1996). More recent mapping, however, indicates that they are previously unrecognized Silurian and Ordovician metamorphic rocks that are less deformed than those of the Wales Group (S.M. Karl, oral communication, 2003). The prospect also includes a breccia zone about 5 feet thick that consists of rock fragments cemented by quartz and calcite with pyrite, sphalerite, and galena (Maas and others, 1991). A representative sample across the breccia contained 1,065 parts per billion (ppb) gold and 4,311 parts per million (ppm) zinc. A selected sample of sulfide-rich rock contained 6,797 ppb gold, 23.5 ppm silver, 3,210 ppm lead, and 8.87 percent zinc.
Workings: Only surface sampling in a borrow pit.
Age: The stratiform sulfide-bearing veins may represent Silurian or Ordovician massive-sulfide-type mineralization. The sulfide-bearing breccia is epigenetic and younger.

Commodities (Major) - Ag, Au, Pb, Zn
Development Status: None
Deposit Model: Breccia zone with sulfides; possible massive-sulfide-type mineralization in the

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


2 valid minerals.

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Galena2.CD.10PbS
Pyrite2.EB.05aFeS2

List of minerals for each chemical element

SSulfur
S GalenaPbS
S PyriteFeS2
FeIron
Fe PyriteFeS2
PbLead
Pb GalenaPbS

Other Databases

Link to USGS - Alaska:CR175

Other Regions, Features and Areas containing this locality


This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

 
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