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Dietrich Quarry, Mile marker 222 Dalton highway, Koyukuk District, Yukon-Koyukuk Census Area, Alaska, USAi
Regional Level Types
Dietrich QuarryQuarry (Active)
Mile marker 222 Dalton highway- not defined -
Koyukuk DistrictMining District
Yukon-Koyukuk Census AreaCensus Area

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Latitude & Longitude (WGS84):
67° 51' 9'' North , 149° 49' 30'' West
Latitude & Longitude (decimal):
Locality type:
Quarry (Active) - last checked 2019
Deposit first discovered:
2018 (approx.)
Köppen climate type:

While performing roadwork for the Alaska Department of Transportation in June, 2018, Great Northwest, Inc., a private construction contractor, encountered a fibrous mineral in a small BLM-permitted quarry at mile marker 222 along the Dalton Highway. The nearest town to the quarry is Wiseman (population 14), several miles away from the Dalton Highway itself, near mile marker 188, and nearly 40 miles away from the quarry.

The quarry workings produced the first confirmed occurrence of magnesiocarpholite in North America. Analytical work included PLM, EDS, XRD, and SAED.

Regions containing this locality

North America PlateTectonic Plate
Rocky Mountains, North AmericaMountain Range

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Commodity List

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

Mineral List

2 valid minerals.

Detailed Mineral List:

Formula: CaCO3
Reference: Nikischer, T. (2019): Magnesiocarpholite: The First U.S. Occurrence, Mineral News, 36,6 (in press)
'Chlorite Group'
Reference: Nikischer, T. (2019): Magnesiocarpholite: The First U.S. Occurrence, Mineral News, 36,6 (in press)
Formula: (Mg,Fe2+)Al2(Si2O6)(OH)4
Reference: Nikischer, T. (2019): Magnesiocarpholite: The First U.S. Occurrence, Mineral News, 36,6 (in press)

List of minerals arranged by Strunz 10th Edition classification

Group 5 - Nitrates and Carbonates
Group 9 - Silicates
Unclassified Minerals, Rocks, etc.
'Chlorite Group'-

List of minerals arranged by Dana 8th Edition classification

Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=2
Unclassified Minerals, Mixtures, etc.
'Chlorite Group'-

List of minerals for each chemical element

H Magnesiocarpholite(Mg,Fe2+)Al2(Si2O6)(OH)4
C CalciteCaCO3
O Magnesiocarpholite(Mg,Fe2+)Al2(Si2O6)(OH)4
O CalciteCaCO3
Mg Magnesiocarpholite(Mg,Fe2+)Al2(Si2O6)(OH)4
Al Magnesiocarpholite(Mg,Fe2+)Al2(Si2O6)(OH)4
Si Magnesiocarpholite(Mg,Fe2+)Al2(Si2O6)(OH)4
Ca CalciteCaCO3
Fe Magnesiocarpholite(Mg,Fe2+)Al2(Si2O6)(OH)4

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

0 - 2.588 Ma

ID: 1608256
Unconsolidated surficial deposits, undivided

Age: Pleistocene (0 - 2.588 Ma)

Description: Flood-plain alluvium.

Lithology: Unconsolidated

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]

2.588 - 23.03 Ma

ID: 626540
Supracrustal; Sedimentary and/or volcanic: undivided

Age: Neogene (2.588 - 23.03 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: Sedimentary and/or volcanic rock: undivided

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]

Late Devonian
358.9 - 382.7 Ma

ID: 3187982
Paleozoic sedimentary rocks

Age: Late Devonian (358.9 - 382.7 Ma)

Lithology: Sedimentary rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

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


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Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Nikischer, T. (2019): Magensiocarpholite: the First U.S. Occurrence, Mineral News, 35, 6. (In press)

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