Graham and Harrison Prospect, Prince William Sound Mining District, Valdez-Cordova Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Graham and Harrison Prospect | Prospect |
| Prince William Sound Mining District | Mining District |
| Valdez-Cordova Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
60° 16' 13'' North , 147° 44' 9'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Mindat Locality ID:
197779
Long-form identifier:
mindat:1:2:197779:3
GUID (UUID V4):
2e972969-8ccf-445e-9c60-04d50bc009a3
Location: The prospect is located at 1,300 feet elevation in a saddle southeast of peak 1995, in the divide that separates the head of Snug Harbor from Montague Strait. It is in the NW1/4 section 16, T. 2 N., R. 10 E., of the Seward Meridian. This is location 238 of Cobb and Tysdal (1980) and location S-40 of Jansons and others (1984). This location is accurate to within a quarter of a mile.
Geology: The prospect consists of veins and layers of disseminated sulfides within several hundred feet of brecciated and schistose sheeted dikes of the Orca Group of early Teriary age (Cobb and Tysdal, 1980). The sulfide minerals are exposed in two open cuts driven along a N45E-trending shear zone. The zone dips from vertical to 80 SE (Kurtak and Jeske, 1986). The exposed sulfides consist mainly of disseminated pyrrhotite and chalcopyrite blebs along cleavage planes (Kurtak and Jeske, 1986). Grant and Higgins (1909) examined hand samples from a reported 1- to 4-foot-wide quartz vein on the prospect that contained pyrrhotite and chalcopyrite. A random chip sample from one of the open cuts contained 1.4 percent copper and 20 ppm silver (Kurtak and Jeske, 1986).
Workings: There are two open cuts on the prospect; their size is unknown. Grant and Higgins (1909) described a 60-foot adit in the area, but the U.S. Bureau of Mines did not find it when they visited the prospect in the early 1980's. A chip sample was collected from the shear zone exposed in one of the open cuts. It contained 1.4 percent copper and 20 ppm silver (Kurtak and Jeske, 1986).
Age: Tertiary or younger; the occurrence is in rocks of the Orca Group of Tertiary age.
Alteration: Basalt is altered to greenstone.
Commodities (Major) - Cu
Development Status: None
Deposit Model: Cyprus massive sulfide (Cox and Singer, 1986; model 24a)
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
3 valid minerals.
Detailed Mineral List:
| ⓘ Chalcopyrite Formula: CuFeS2 |
| ⓘ Pyrrhotite Formula: Fe1-xS |
| ⓘ Quartz Formula: SiO2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | 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 |
| Fe | Iron | |
| Fe | ⓘ Chalcopyrite | CuFeS2 |
| Fe | ⓘ Pyrrhotite | Fe1-xS |
| Cu | Copper | |
| Cu | ⓘ Chalcopyrite | CuFeS2 |
Other Databases
| Link to USGS - Alaska: | SR246 |
|---|
Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Yakutat-Malaspina DomainDomain
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References
