Unnamed Occurrence (ARDF - CV065; south-central Hinchinbrook Island), Copper River Mining District, Valdez-Cordova Census Area, Alaska, USAi
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Latitude & Longitude (WGS84):
60° 21' 7'' North , 146° 25' 29'' West
Latitude & Longitude (decimal):
Köppen climate type:
Mindat Locality ID:
200676
Long-form identifier:
mindat:1:2:200676:8
GUID (UUID V4):
269879e2-65cd-42e9-8bfc-165fa2c35452
Location is within the Chugach National Forest.
Location: This site is located on Hinchinbrook Island and occupies an area of approximately 0.25 sq. mi. in the center of sec. 34, T. 17 S., R. 7 W., of the Copper River Meridian. The center of the area is at approximately the 1500 ft elevation. Location is accurate to within 600 ft. Shown as site C-98 in Jansons and others (1984).
Geology: This occurrence consists of a 30 x 90 ft. outcrop area of manganese-bearing nodules and encrustations in an interbedded sequence of sedimentary and volcanic rocks of the Tertiary Orca Group (Nelson and others, 1985). The occurrence is interpreted as a sedimentary manganese deposit developed on the sea floor (Goodfellow and others, 1984). Selected samples contained 29-35% Mn, 14% Fe, 6700 ppm Ba, 3400 ppm Zn (Goodfellow and others, 1984).
Workings: Site discovered during regional geologic mapping (Nelson and others, 1985). Minor interest by industry during exploration activity in mid-1980s. Selected samples contained 29-35% Mn, 14% Fe, 6700 ppm Ba, 3400 ppm Zn (Goodfellow and others, 1984).
Age: Probably Tertiary based on the age of the host rocks.
Commodities (Major) - Mn; (Minor) - Ba, Fe, Zn
Development Status: None
Deposit Model: Volcanogenic Mn (Cox and Singer, 1986; model 24c)
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:
ⓘ Baryte Formula: BaSO4 |
ⓘ Bementite Formula: Mn7Si6O15(OH)8 |
ⓘ Ranciéite Formula: (Ca,Mn2+)0.2(Mn4+,Mn3+)O2 · 0.6H2O |
ⓘ Todorokite Formula: (Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
Group 4 - Oxides and Hydroxides | |||
---|---|---|---|
ⓘ | Todorokite | 4.DK.10 | (Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O |
ⓘ | Ranciéite | 4.FL.40 | (Ca,Mn2+)0.2(Mn4+,Mn3+)O2 · 0.6H2O |
Group 7 - Sulphates, Chromates, Molybdates and Tungstates | |||
ⓘ | Baryte | 7.AD.35 | BaSO4 |
Group 9 - Silicates | |||
ⓘ | Bementite | 9.EE.05 | Mn7Si6O15(OH)8 |
List of minerals for each chemical element
H | Hydrogen | |
---|---|---|
H | ⓘ Bementite | Mn7Si6O15(OH)8 |
H | ⓘ Ranciéite | (Ca,Mn2+)0.2(Mn4+,Mn3+)O2 · 0.6H2O |
H | ⓘ Todorokite | (Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O |
O | Oxygen | |
O | ⓘ Baryte | BaSO4 |
O | ⓘ Bementite | Mn7Si6O15(OH)8 |
O | ⓘ Ranciéite | (Ca,Mn2+)0.2(Mn4+,Mn3+)O2 · 0.6H2O |
O | ⓘ Todorokite | (Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O |
Na | Sodium | |
Na | ⓘ Todorokite | (Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O |
Mg | Magnesium | |
Mg | ⓘ Todorokite | (Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O |
Al | Aluminium | |
Al | ⓘ Todorokite | (Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O |
Si | Silicon | |
Si | ⓘ Bementite | Mn7Si6O15(OH)8 |
S | Sulfur | |
S | ⓘ Baryte | BaSO4 |
K | Potassium | |
K | ⓘ Todorokite | (Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O |
Ca | Calcium | |
Ca | ⓘ Ranciéite | (Ca,Mn2+)0.2(Mn4+,Mn3+)O2 · 0.6H2O |
Ca | ⓘ Todorokite | (Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O |
Mn | Manganese | |
Mn | ⓘ Bementite | Mn7Si6O15(OH)8 |
Mn | ⓘ Ranciéite | (Ca,Mn2+)0.2(Mn4+,Mn3+)O2 · 0.6H2O |
Mn | ⓘ Todorokite | (Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O |
Sr | Strontium | |
Sr | ⓘ Todorokite | (Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O |
Ba | Barium | |
Ba | ⓘ Baryte | BaSO4 |
Ba | ⓘ Todorokite | (Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O |
Other Databases
Link to USGS - Alaska: | CV065 |
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Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Yakutat-Malaspina DomainDomain
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