Valdez Mine, Chistochina Mining District, Valdez-Cordova Census Area, Alaska, USAi
Regional Level Types | |
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Valdez Mine | Mine |
Chistochina Mining District | Mining District |
Valdez-Cordova Census Area | Census Area |
Alaska | State |
USA | Country |
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Latitude & Longitude (WGS84):
61° 38' 42'' North , 143° 42' 56'' West
Latitude & Longitude (decimal):
Type:
KΓΆppen climate type:
Mindat Locality ID:
202760
Long-form identifier:
mindat:1:2:202760:2
GUID (UUID V4):
d38deb4a-0e37-46b2-8008-2a6e61d70c16
Location: The locality is in the Wrangell-Saint Elias National Park and Preserve. This mine is on the northeast valley wall of Nugget Creek. It is at an elevation of about 3,700 feet, 1,200 feet upslope of USLM No. 15, and about 1,800 feet southwest of elevation 4660. The location of the mine is shown on the McCarthy C-8 quadrangle (1995 edition) in the NE1/4 of section 2, T3S, R9E of the Copper River Meridian. This is locality 139 of MacKevett (1976) and locality 18 of MacKevett and others (1978). It is accurately located. Cobb and MacKevett (1980) included this mine under the name 'Nugget Cr.'.
Geology: The deposit at this mine consists of discontinuous dolomite and calcite veins and lenses up to several feet thick that contain bornite, chalcopyrite, pyrite, and a little chalcocite and covellite (Moffit and Mertie, 1923; Van Alstine and Black, 1946). The veins and lenses are localized in a fault zone that cuts Triassic Nikolai Greenstone (Moffit and Mertie, 1923; MacKevett, 1976). A sample of the mineralization contained 200 parts per million silver and more than 2 percent copper (MacKevett, 1976). The widespread deposition of copper in Triassic greenstone and limestone in the area is thought to have accompanied regional deformation and low-grade metamorphism in the Late Jurassic or Early Cretaceous (MacKevett and others, 1997). Copper-bearing minerals were deposited in the underlying Nikolai Greenstone at about 112 Ma (Silberman and others, 1980).
Workings: The deposits were explored and developed over 420 vertical feet by 4,000 feet of underground workings including adits, drifts, crosscuts, winzes, and shafts (Moffit and Mertie, 1923, fig. 7). A mill was located at the mine.
Age: Cretaceous? The widespread deposition of copper in Triassic greenstone and limestone in the area is thought to have accompanied regional deformation and low-grade metamorphism in the Late Jurassic or Early Cretaceous (MacKevett and others, 1997). Copper-bearing minerals were deposited in the underlying Nikolai Greenstone at about 112 Ma (Silberman and others, 1980).
Production: Two carloads of high-grade, hand-sorted ore were shipped before 1916 and 160 tons of concentrate and hand-sorted ore were shipped between 1916 and 1919.
Commodities (Major) - Ag, Cu
Development Status: Yes; small
Deposit Model: Basaltic Cu (Cox and Singer, 1986; model 23)
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
9 valid minerals.
Rock Types Recorded
Note: data is currently VERY limited. Please bear with us while we work towards adding this information!
Select Rock List Type
Alphabetical List Tree DiagramDetailed Mineral List:
β Bornite Formula: Cu5FeS4 |
β Calcite Formula: CaCO3 |
β Chalcocite Formula: Cu2S |
β Chalcopyrite Formula: CuFeS2 |
β Copper Formula: Cu Description: Slablike copper nugget weighing several tonnes found as float in Nugget Creek near workings. |
β Covellite Formula: CuS |
β Dolomite Formula: CaMg(CO3)2 |
β Pyrite Formula: FeS2 |
β Quartz Formula: SiO2 Description: One meter thick vein. |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
Group 1 - Elements | |||
---|---|---|---|
β | Copper | 1.AA.05 | Cu |
Group 2 - Sulphides and Sulfosalts | |||
β | Chalcocite | 2.BA.05 | Cu2S |
β | Bornite | 2.BA.15 | Cu5FeS4 |
β | Covellite | 2.CA.05a | CuS |
β | Chalcopyrite | 2.CB.10a | CuFeS2 |
β | Pyrite | 2.EB.05a | FeS2 |
Group 4 - Oxides and Hydroxides | |||
β | Quartz | 4.DA.05 | SiO2 |
Group 5 - Nitrates and Carbonates | |||
β | Calcite | 5.AB.05 | CaCO3 |
β | Dolomite | 5.AB.10 | CaMg(CO3)2 |
List of minerals for each chemical element
C | Carbon | |
---|---|---|
C | β Calcite | CaCO3 |
C | β Dolomite | CaMg(CO3)2 |
O | Oxygen | |
O | β Calcite | CaCO3 |
O | β Dolomite | CaMg(CO3)2 |
O | β Quartz | SiO2 |
Mg | Magnesium | |
Mg | β Dolomite | CaMg(CO3)2 |
Si | Silicon | |
Si | β Quartz | SiO2 |
S | Sulfur | |
S | β Bornite | Cu5FeS4 |
S | β Chalcopyrite | CuFeS2 |
S | β Chalcocite | Cu2S |
S | β Covellite | CuS |
S | β Pyrite | FeS2 |
Ca | Calcium | |
Ca | β Calcite | CaCO3 |
Ca | β Dolomite | CaMg(CO3)2 |
Fe | Iron | |
Fe | β Bornite | Cu5FeS4 |
Fe | β Chalcopyrite | CuFeS2 |
Fe | β Pyrite | FeS2 |
Cu | Copper | |
Cu | β Bornite | Cu5FeS4 |
Cu | β Chalcopyrite | CuFeS2 |
Cu | β Chalcocite | Cu2S |
Cu | β Covellite | CuS |
Cu | β Copper | Cu |
Other Databases
Link to USGS - Alaska: | MC038 |
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Other Regions, Features and Areas containing this locality
North America
- Wrangell MountainsMountain Range
North America PlateTectonic Plate
- Wrangellia DomainDomain
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