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Jade Mountain Mine, Kiana District, Northwest Arctic Borough, Alaska, USA

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Latitude & Longitude (WGS84): 67° 12' 35'' North , 158° 3' 0'' West
Latitude & Longitude (decimal): 67.20972,-158.05000


There also has been minor production of nephrite jade from stream gravels of Jade Creek.
Location: Located on south slope of Jade Mountain above Jade Creek in T. 21 N., R. 4 E., Kateel River Meridian. Shown as locality 14 in Mayfield and Grybeck (1978) and accurate to within 2000 ft. (600 m).
Geology: 2 sq. mi. (3.2 square km) area of highly serpentinized ultramafic rock contains residual inclusions of nephrite jade and schistose nephrite containing 0.25-0.5 in. (0.5 -1 cm) wide veinlets of chrysotile and tremolite asbestos; some slip - fiber chrysotile in fibers up to 5 in. (11 cm) long (Anderson, 1945, p. 22-25).
Workings: Short tunnel driven on asbestos veins many years prior to USBM study (Heide and others, 1949).

Commodities (Major) - Jade; (Minor) - Asbestos
Development Status: Yes; small
Deposit Model: Serpentine-hosted asbestos

Mineral List


2 valid minerals.

Rock Types Recorded

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Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Jurassic
145 - 201.3 Ma
Ultramafic complexes of western Alaska

Age: Jurassic (145 - 201.3 Ma)

Description: The complexes consist of: (1) a cumulate magmatic suite composed of interlayered dunite, wehrlite, olivine clinopyroxenite, and gabbro, (2) a mantle suite composed of harzburgite, dunite, and minor clinopyoxenite, and (3) a metamorphic sole consisting of a highly tectonized layer of amphibolite, garnet amphibolite, and pyroxene granulite. The harzburgite in the mantle suite typically is partly to mostly serpentinized. Chromite is generally restricted to centimeter-scale layers in dunite and as an accessory mineral. The complexes are intruded by narrow dikes of fresh clinopyroxenite, hornblendite, gabbro, and gabbro pegmatite The complexes appear to form the roots of the Koyukuk volcanic arc that was active from Jurassic to late Early Cretaceous. The protolith age of the mantle suite is uncertain and may be as old as Paleozoic. Unit exposed along southeastern and northern borders of Yukon-Koyukuk Basin, in the south-central part of Unalakleet quadrangle where it is spatially associated with the trondhjemite and tonalite unit Jgt, and in one small area along the western border of the basin in southern Candle quadrangle. Also included in this unit is a small complex exposed in a window(?) through the Innoko terrane in the south-central part of Ophir quadrangle

Lithology: Igneous

Reference: Wilson, F.H., Hults, C.P., Mull, C.G, and Karl, S.M. (compilers). Geologic map of Alaska. doi: 10.3133/sim3340. U.S. Geological Survey Scientific Investigations Map 3340, pamphlet 196. [21]

Jurassic
145 - 201.3 Ma
Igneous: intrusive; Intrusive: peridotitic

Age: Jurassic (145 - 201.3 Ma)

Description: Brooks Range, Chukotka, Arctic Shelf, Brooks Range; Seward, western Chukotka

Comments: Orogen, fold-thrust belt, folded region; Wilson & Hults, unpublished compilation, 2007-08

Lithology: Pyroxenite, peridotite, dunite, harzburgite, wherlite, gabbro

Reference: J.C. Harrison, M.R. St-Onge, O.V. Petrov, S.I. Strelnikov, B.G. Lopatin, F.H. Wilson, S. Tella, D. Paul, T. Lynds, S.P. Shokalsky, C.K. Hults, S. Bergman, H.F. Jepsen, and A. Solli. Geological map of the Arctic. doi:10.4095/287868. Geological Survey of Canada Map 2159A. [2]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License



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

Anderson, Eskil, 1945, Asbestos and jade occurrences in the Kobuk River region, Alaska: Alaska Territorial Department of Mines Pamphlet 3-R, 26 p. Anderson, Eskil, 1947, Mineral occurrences other than gold deposits in northwestern Alaska: Alaska Territorial Division of Mines Pamphlet 5-R, 48 p. Heide, H.E., Wright, W.S., and Rutledge, F.A., 1949, Investigations of the Kobuk River asbestos deposits, Kobuk district, northwest Alaska: U.S. Bureau of Mines Report of Investigations 4414, 21 p. Mayfield, C.F., and Grybeck, D., 1978, Mineral occurrences and resource map of the Ambler River quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-120-I, 1 sheet, scale 1:250,000.

 
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