Halibut Bay 44 Occurrence, Kodiak Mining District, Kodiak Island Borough, Alaska, USAi
| Regional Level Types | |
|---|---|
| Halibut Bay 44 Occurrence | Occurrence |
| Kodiak Mining District | Mining District |
| Kodiak Island Borough | Borough |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
57° 21' 32'' North , 154° 37' 19'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Site is located in Kodiak National Wildlife Refuge.
Location: This site is located 5.1 miles northwest of Anvil Mountain in sec. 32, T. 32 S., R. 33 W., of the Seward Meridian (Foley and Barker, 1985, figure 25, locality 44; Foley and others, 1989, locality 32). Site location is accurate to within several hundred feet.
Geology: At this chromite occurrence, one of several known within the Halibut Bay ultramafic complex, massive, sheared chromite is present in rubblecrop composed of interlayered serpentinized dunite, clinopyroxenite, and anorthosite. The layers range in thickness from several inches to several feet, strike eastward, and dip vertically. The strike length of mineralization is inferred to be 225 feet with a dip length of 56 feet. A 3-foot wide zone, exposed in a trench was estimated to contain 20 percent chromite (Foley and Barker, 1985, table 13). Tonnage was estimated at 2000 tons. A high-grade sample from this zone had a head grade of 47.5 percent chromite and a gravity concentrate grade of 65.5 percent chromite. The concentrate had a chrome:iron ratio of 2.8 and contained traces of gold, silver, platinum, and palladium (Dahlin and others, 1985, table A-28). 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: Based on exposures in a 150-foot trench, Foley and Barker (1985, table 13) estimate the zone to contain 2000 tons of rock grading 20 percent chromite. A bulk sample had a head grade of 47.5 percent chromite and a gravity concentrate grade of 65.5 percent chromite. The concentrate gave a chrome:iron ratio of 2.8 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 2,000 tons of rock grading 20 percent chromite.
Commodities (Major) - Cr
Development Status: None
Deposit Model: Podiform chromite (Cox and Singer, 1986; model 8a).
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: | KR019 |
|---|
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