Blue Ribbon Prospect, Prince William Sound Mining District, Valdez-Cordova Census Area, Alaska, USAi
Regional Level Types | |
---|---|
Blue Ribbon 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):
61° 12' 30'' North , 146° 15' 50'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
Place | Population | Distance |
---|---|---|
Valdez | 3,870 (2017) | 9.7km |
Mindat Locality ID:
196555
Long-form identifier:
mindat:1:2:196555:4
GUID (UUID V4):
9e5a8768-a1bc-48c7-84d9-bbc2624a36c1
Location: This prospect is located on the south side of a west-trending glacier lobe, about one-quarter mile east of elevation 4030; it is at an elevation of about 3,800 feet in the NW1/4 section 2, T. 8 S., R. 6 W., of the Copper River Meridian. This prospect is probably located to within one-quarter mile. It is locality 31 of Cobb and Matson (1972) and locality 24 of Winkler and others (1981 [OFR 80-892-B]).
Geology: A gold-bearing quartz vein, from a few inches to 8 inches thick and that locally including ribbon quartz zones as much as 8 inches thick, cuts metaflysch of the Valdez Group at this prospect (Brooks, 1912). The vein strikes east-west, parallel to the foliation in the host rocks. It has been traced over a distance of 1,000 feet along strike, an exceptionally long distance for quartz veins in the area. This vein is probably similar to others that are widespread in the southern Valdez quadrangle. Data summarized by Goldfarb and others (1997) show that gold-bearing quartz veins in the Valdez Group commonly contain pyrite, arsenopyrite, carbonate minerals, chlorite, and white mica and formed from water-rich fluids with 5 to 15 mole percent CO2 and significant amounts of CH4, N2, and H2S. The vein-forming fluid salinities were less than 8 percent, vein formation temperatures ranged from 225 to 375 degrees centigrade, and emplacement depths varied from 3 to 10 kilometers. The vein-forming fluids were produced by metamorphic devolatization reactions. Radiometric dating indicates that the veins formed from 57 to 49 Ma (Goldfarb and others, 1997, p. 171), when deep parts of the accreted Valdez Group flysch underwent high-grade metamorphism and partial melting (Hudson, 1994).
Workings: This vein was probably explored with small trenches and open cuts.
Age: Radiometric dating indicates that the gold-bearing quartz veins in the Valdez Group formed from 57 to 49 Ma (Goldfarb and others, 1997, p. 171), when deep parts of the accreted Valdez Group flysch underwent high-grade metamorphism and partial melting (Hudson, 1994).
Alteration: Country rocks to gold-bearing quartz veins in Valdez Group metaflysch can be variably silicified, carbonitized, and sericitized (Goldfarb and others, 1997).
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
5 valid minerals.
Detailed Mineral List:
ⓘ Arsenopyrite Formula: FeAsS |
ⓘ 'Chlorite Group' |
ⓘ Gold Formula: Au |
ⓘ Muscovite Formula: KAl2(AlSi3O10)(OH)2 |
ⓘ Muscovite var. Sericite Formula: KAl2(AlSi3O10)(OH)2 |
ⓘ Pyrite Formula: FeS2 |
ⓘ Quartz Formula: SiO2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
Group 1 - Elements | |||
---|---|---|---|
ⓘ | 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 |
Group 9 - Silicates | |||
ⓘ | Muscovite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
ⓘ | var. Sericite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
Unclassified | |||
ⓘ | 'Chlorite Group' | - |
List of minerals for each chemical element
H | Hydrogen | |
---|---|---|
H | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
H | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
O | Oxygen | |
O | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
O | ⓘ Quartz | SiO2 |
O | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
Al | Aluminium | |
Al | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
Al | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
Si | Silicon | |
Si | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
Si | ⓘ Quartz | SiO2 |
Si | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
S | Sulfur | |
S | ⓘ Arsenopyrite | FeAsS |
S | ⓘ Pyrite | FeS2 |
K | Potassium | |
K | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
K | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
Fe | Iron | |
Fe | ⓘ Arsenopyrite | FeAsS |
Fe | ⓘ Pyrite | FeS2 |
As | Arsenic | |
As | ⓘ Arsenopyrite | FeAsS |
Au | Gold | |
Au | ⓘ Gold | Au |
Other Databases
Link to USGS - Alaska: | VA122 |
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Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Chugach DomainDomain
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