Unnamed Occurrence (ARDF - SR257; east side of Knight Island), Prince William Sound Mining District, Valdez-Cordova Census Area, Alaska, USAi
This page is currently not sponsored. Click here to sponsor this page.
Latitude & Longitude (WGS84):
60° 17' 2'' North , 147° 42' 28'' West
Latitude & Longitude (decimal):
Köppen climate type:
Location: The occurrence is located near tidewater, about 3 miles southwest of the mouth of Marsha Bay. It is in the NW1/4 section 10, T. 2 N., R. 10 E., of the Seward Meridian. This is location 141 of MacKevett and Holloway (1977), location 239 of Cobb and Tysdal (1980), and location S-41 of Jansons and others (1984). This location is accurate to within a quarter of a mile.
Geology: The country rock is slate, graywacke, and greenstone of the Orca Group of early Teriary age (Nelson and others, 1985). Greenstone encloses slate lenses less than 50 feet long and more than 20 feet wide. These lenses contain as much as 1 percent chalcopyrite. A 25-foot-wide tuffaceous zone in the greenstone contains as much as 5 percent chalcopyrite (Kurtak and Jeske, 1986). A greenstone-slate breccia zone with a quartz matrix contained a trace of chalcopyrite. Tysdal (1978 [MF-880-A]) reported one mineralized zone, 7.5 meters wide and 9 meters long, containing quartz, chalcopyrite, pyrrhotite, and sphalerite. A 20-foot-wide random chip sample of a 20-foot-wide mineralized slate lens contained 480 ppm copper and 580 ppm zinc. A 25-foot-wide random chip sample of the tuffaceous zone contained 0.24 percent copper and 1.1 percent zinc (Kurtak and Jeske, 1986). The greenstone-slate breccia zone was not sampled.
Workings: A 20-foot-wide random chip sample of the mineralized slate unit contained 480 ppm copper and 580 ppm zinc. A 25-foot-wide random chip sample of the tuffaceous zone contained 0.24 percent copper and 1.1 percent zinc (Kurtak and Jeske, 1986). The greenstone-slate breccia zone was not sampled. No workings or improvements are reported.
Age: Tertiary or younger; the occurrence is in rocks of the Orca Group of Tertiary age.
Alteration: Greenstone is altered basalt.
Commodities (Major) - Cu, Zn
Development Status: None
Deposit Model: Besshi massive sulfide (Cox and Singer, 1986; model 24b)
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
4 valid minerals.
Detailed Mineral List:
| ⓘ Chalcopyrite Formula: CuFeS2 |
| ⓘ Pyrrhotite Formula: Fe1-xS |
| ⓘ Quartz Formula: SiO2 |
| ⓘ Sphalerite Formula: ZnS |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Sphalerite | 2.CB.05a | ZnS |
| ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
| ⓘ | Pyrrhotite | 2.CC.10 | Fe1-xS |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Quartz | SiO2 |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| S | Sulfur | |
| S | ⓘ Chalcopyrite | CuFeS2 |
| S | ⓘ Pyrrhotite | Fe1-xS |
| S | ⓘ Sphalerite | ZnS |
| Fe | Iron | |
| Fe | ⓘ Chalcopyrite | CuFeS2 |
| Fe | ⓘ Pyrrhotite | Fe1-xS |
| Cu | Copper | |
| Cu | ⓘ Chalcopyrite | CuFeS2 |
| Zn | Zinc | |
| Zn | ⓘ Sphalerite | ZnS |
Other Databases
| Link to USGS - Alaska: | SR257 |
|---|
Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Prince WilliamAccretionary Complex
- Yakutat-Malaspina DomainDomain
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.
