Halibut Bay 46 Occurrence, Kodiak Mining District, Kodiak Island Borough, Alaska, USAi
| Regional Level Types | |
|---|---|
| Halibut Bay 46 Occurrence | Occurrence |
| Kodiak Mining District | Mining District |
| Kodiak Island Borough | Borough |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
57° 21' 14'' North , 154° 35' 5'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Mindat Locality ID:
197885
Long-form identifier:
mindat:1:2:197885:1
GUID (UUID V4):
964d5c06-e460-4ae0-afb6-5a49d618374e
Site is located within Kodiak National Wildlife Refuge.
Location: This site is located 4.6 miles north of Anvil Mountain in sec. 33, T. 32 S., R 33 W., of the Seward Meridian (Foley and Barker, 1985, figure 25, locality 46; Foley and others, 1989, locality 32). Site location is accurate to within several hundred feet.
Geology: This chromite occurrence, one of several within the Halibut Bay ultramafic complex, consists of segregations and disseminations of magnetic chromite within a 35-foot thick dunite layer which is bounded by clinopyroxenite. The dunite layer strikes N. 10 W. and has an inferred strike length of 750 feet and an inferred dip length of 187 feet. Foley and Barker (1985, table 13) estimate that the layer contains 43,000 tons of rock grading 7 percent chromite. A bulk sample of the mineralized dunite had a head grade of 7.7 percent chromite and a gravity concentrate grade of 34.6 percent. The concentrate had a chrome:iron ratio of 1.1 and contained traces of gold, silver, platinum, and palladium (Dahlin and others, 1985, table A-28). No estimates of recoverable chromite were made because of the inferior quality of the concentrate. The Halibut Bay ultramafic complex, consisting mostly of dunite, gabbro, pyroxenite, and peridotite, occurs within sedimentary units of the Uyak formation of Cretaceous age
Workings: This deposit is estimated to contain 43,000 tons of rock grading 7 percent chromite (Foley and Barker, 1985, table 13). A bulk sample had a head grade of 7.7 percent chromite and a gravity concentrate grade of 34.6 percent chromite. The chrome:iron ratio of the concentrate was 1.1 and contained traces of gold, silver, platinum, and palladium (Dahlin and others, 1985, table A-28).
Alteration: The ultramafic country rock is serpentinized?
Reserves: This deposit is estimated to contain 43,000 tons grading 7 percent chromite. Concentrates of the chromite indicate inferior quality.
Commodities (Major) - Cr
Development Status: None
Deposit Model: Podiform chromite (Cox and Singer, 1986; model 8b).
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
1 valid mineral.
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | Chromite | 4.BB.05 | Fe2+Cr3+2O4 |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Chromite | Fe2+Cr23+O4 |
| Cr | Chromium | |
| Cr | ⓘ Chromite | Fe2+Cr23+O4 |
| Fe | Iron | |
| Fe | ⓘ Chromite | Fe2+Cr23+O4 |
Other Databases
| Link to USGS - Alaska: | KR021 |
|---|
Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
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References
