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Unnamed Occurrence (ARDF - BT017; west of Sithylemenkat Lake), Koyukuk Mining District, Yukon-Koyukuk Census Area, Alaska, USAi
Regional Level Types
Unnamed Occurrence (ARDF - BT017; west of Sithylemenkat Lake)- not defined -
Koyukuk Mining DistrictMining District
Yukon-Koyukuk Census AreaCensus Area
AlaskaState
USACountry

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Latitude & Longitude (WGS84):
66° 7' 41'' North , 151° 26' 56'' West
Latitude & Longitude (decimal):
66.12806,-151.44889
GeoHash:
G#: beu21wnrc
GRN:
N45W46
Köppen climate type:
Dfc : Subarctic climate
Mindat Locality ID:
200580
Long-form identifier:
mindat:1:2:200580:8
GUID (UUID V4):
0


See also: Caribou Mountain (BT011).
Location: This occurrence is at an elevation of about 1,100 feet on the ridge about 0.75 mile west-northwest of the outlet of Sithylemenkat Lake. The location is accurate to within one-half mile.
Geology: This occurrence consists of chromite as an accessory mineral in mafic and ultramafic rocks (Foley, 1992). The rocks are part of the Caribou Mountain-Melozitna ultramafic belt which hosts chromite occurrences elsewhere. The rocks that define the belt consist of serpentinized dunite, peridotite, and gabbro. A serpentinite sample from a frost boil contains 700 ppm cobalt, 3,000 ppm chromium, and 500 ppm copper (Foley, 1992). Kurtak and others (1999 and 2002) report that 3 samples of serpentinized dunite and/or gabbro contain as much as 0.74% chromium, 120 ppm cobalt, and 2,400 ppm nickel Disseminated chromite was observed in the sample with the highest chromium value.
Workings: Only surface sampling.
Alteration: Serpentinization.

Commodities (Major) - Co, Cr; (Minor) - Ni
Development Status: None
Deposit Model: Podiform chromite (Cox and Singer, 1986; model 8a)

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


2 valid minerals.

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
ⓘChromite4.BB.05Fe2+Cr3+2O4
ⓘMagnetite4.BB.05Fe2+Fe3+2O4
Unclassified
ⓘ'Serpentine Subgroup'-D3[Si2O5](OH)4

List of minerals for each chemical element

HHydrogen
Hⓘ Serpentine SubgroupD3[Si2O5](OH)4
OOxygen
Oⓘ ChromiteFe2+Cr23+O4
Oⓘ MagnetiteFe2+Fe23+O4
Oⓘ Serpentine SubgroupD3[Si2O5](OH)4
SiSilicon
Siⓘ Serpentine SubgroupD3[Si2O5](OH)4
CrChromium
Crⓘ ChromiteFe2+Cr23+O4
FeIron
Feⓘ ChromiteFe2+Cr23+O4
Feⓘ MagnetiteFe2+Fe23+O4

Other Databases

Link to USGS - Alaska:BT017

Other Regions, Features and Areas containing this locality

North AmericaContinent
North America PlateTectonic Plate

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

Barker, J.C., and Foley, J.Y., 1986, Tin reconnaissance of the Kanuti and Hodzana Rivers uplands, central Alaska: U.S. Bureau of Mines Information Circular 9104, 27 p. Foley, J.Y., 1992, Ophiolite and other ultramafic metallogenic provinces in Alaska (west of the 141th meridian): U.S. Geological Survey Open-File Report 92-20-B, 55 p. Foley, J.Y., Barker, J.C., and Brown, L.L., 1985, Critical and strategic minerals investigation in Alaska - chromium: U.S. Bureau of Mines Open-File Report 97-85, 54 p., 1 sheet. Foley, J.Y., and McDermott, M.M., 1983, Podiform chromite occurrences in the Caribou Mountain and Lower Kanuti River areas, central Alaska; Part 1--Reconnaissance investigations: U.S. Bureau of Mines Information Circular 8915, 27 p., 1 sheet. Kurtak, J.M., Klieforth, R.F., Clark, J.M., and Maclean, E.A., 2002, Mineral investigations in the Koyukuk mining district, northern Alaska: Final Report: U.S. Bureau of Land Management Technical Report 50, v. 1 and 2, 845 p. Kurtak, J.M., Klieforth, R.F., Clark, J.M., and Williams, E.M., 1999, Mineral investigations in the Koyukuk mining district, northern Alaska--Progress Report: U.S. Bureau of Land Management Open-File Report 74, 158 p. Patton, W.W., Jr., and Miller, T.P., 1970, Preliminary geologic investigations in the Kanuti River region, Alaska: U.S. Geological Survey Bulletin 1312-J, p. J1-J10.
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