Griset; Keynote Prospect, Prince William Sound Mining District, Valdez-Cordova Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Griset; Keynote 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° 58' 8'' North , 147° 59' 16'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Location: The prospect is located near the old post office site in Golden. It is in the SW1/4 section 11, T. 10 N., R. 8 E., of the Seward Meridian. This is location 103 of Condon and Cass (1958), location 77 of Cobb and Richter (1972), location 98 of MacKevett and Holloway (1977), location 158 of Cobb and Tysdal (1980), and location S-131 of Jansons and others (1984). This location is accurate to within a quarter of a mile.
Geology: The Griset prospect is hosted in sheared graywacke and slate of the Valdez Group of Late Cretaceous age (Cobb and Tysdal, 1980). The deposit consist of lenses and stringers of quartz that carry arsenopyrite, pyrite, and, presumably, gold (Cobb and Tysdal, 1980). The workings on the prospect consist of a 10-foot adit near the old post office site and a 6-foot-deep shaft near the beach (Hoekzema and Sherman, 1983). The adit explored a 33-inch-wide shear zone striking N65E and dipping 55N. The zone can be traced for 300 feet; it contains quartz veins and stringers that pinch and swell along strike (Johnson, 1914 [B 592-G, p. 227]). Although the workings suggest that some gold was recovered, Johnson reported no assay results.
Workings: The workings on the prospect consist of a 10-foot adit near the old post office site and a 6-foot-deep shaft near the shore (Hoekzema and Sherman, 1983). The U.S. Bureau of Mines examined the prospect in 1979 but collected no samples (Hoekzema and Sherman, 1983). Johnson (1914 [B 592-G, p. 227]) examined the prospect in the early 1900's but reported no assay results.
Age: Late Cretaceous or younger; the veins cut rocks of the Valdez Group of Late Cretaceous age.
Commodities (Major) - Au
Development Status: None
Deposit Model: Low-sulfide Au-quartz veins (Cox and Singer, 1986; model 36a)
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:
| ⓘ Arsenopyrite Formula: FeAsS |
| ⓘ Native Gold Formula: Au |
| ⓘ Pyrite Formula: FeS2 |
| ⓘ Quartz Formula: SiO2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Native Gold | 1.AA.05 | Au |
| Group 2 - Sulphides and Sulfosalts | |||
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| ⓘ | Arsenopyrite | 2.EB.20 | FeAsS |
| 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 | ⓘ Arsenopyrite | FeAsS |
| S | ⓘ Pyrite | FeS2 |
| Fe | Iron | |
| Fe | ⓘ Arsenopyrite | FeAsS |
| Fe | ⓘ Pyrite | FeS2 |
| As | Arsenic | |
| As | ⓘ Arsenopyrite | FeAsS |
| Au | Gold | |
| Au | ⓘ Native Gold | Au |
Other Databases
| Link to USGS - Alaska: | SR091 |
|---|
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