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Unnamed Occurrence (ARDF - TK056; head of Ocher Creek), Yentna Mining District, Matanuska-Susitna Borough, Alaska, USAi
Regional Level Types
Unnamed Occurrence (ARDF - TK056; head of Ocher Creek)- not defined -
Yentna Mining DistrictMining District
Matanuska-Susitna BoroughBorough
AlaskaState
USACountry

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Latitude & Longitude (WGS84):
62° 31' 44'' North , 148° 31' 8'' West
Latitude & Longitude (decimal):
62.52889,-148.51889
GeoHash:
G#: ben7sr5c5
GRN:
N42W52
Köppen climate type:
Dfc : Subarctic climate
Mindat Locality ID:
201792
Long-form identifier:
mindat:1:2:201792:4
GUID (UUID V4):
0


Location: This occurrence is at an elevation of about 3,800 feet at the head of Ocher Creek, an informal name. It is 1.2 miles southwest of VABM Jaina and 2.5 miles northeast of the Talkeetna River, near the center of the E1/2 sec. 24, T. 28 N., R. 4 E., Seward Meridian. The location is accurate to within 1/4 mile. This is locality 48 of Csejtey and Miller (1978).
Geology: This prospect consists of pyrite, chalcopyrite, and malachite in Triassic(?) greenstone interlayered with phyllite and argillite (Anderson, 1969). In places the phyllite is pyritic and gossanous, with botryoidal crusts of limonite and local brown boxworks formed by the leaching of sulfides. Sulfide-bearing quartz samples contain up to 3 parts per million silver, 0.22 part per million gold, and 750 parts per million copper.
Workings: Only limited surface sampling (Anderson, 1969).
Alteration: Iron and copper staining.

Commodities (Major) - Cu; (Minor) - Ag, Au
Development Status: None
Deposit Model: Basaltic Cu? (Cox and Singer, 1986; model 23?)

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


3 valid minerals.

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
ⓘChalcopyrite2.CB.10aCuFeS2
ⓘPyrite2.EB.05aFeS2
Group 5 - Nitrates and Carbonates
ⓘMalachite5.BA.10Cu2(CO3)(OH)2

List of minerals for each chemical element

HHydrogen
Hⓘ MalachiteCu2(CO3)(OH)2
CCarbon
Cⓘ MalachiteCu2(CO3)(OH)2
OOxygen
Oⓘ MalachiteCu2(CO3)(OH)2
SSulfur
Sⓘ ChalcopyriteCuFeS2
Sⓘ PyriteFeS2
FeIron
Feⓘ ChalcopyriteCuFeS2
Feⓘ PyriteFeS2
CuCopper
Cuⓘ ChalcopyriteCuFeS2
Cuⓘ MalachiteCu2(CO3)(OH)2

Other Databases

Link to USGS - Alaska:TK056

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

Anderson, R.E., 1969, Preliminary geochemistry and geology of the Little Falls Creek area, Talkeetna Mountains quadrangle, Alaska: Alaska Division of Mines and Geology Geochemical Report 19, 16 p., 1 plate, scale 1:45,000. Cobb, E.H., and Csejtey, Bela, Jr., 1980, Summaries of data on and lists of references to metallic and selected nonmetallic mineral deposits in the Talkeetna Mountains quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-716, 63 p. Csejtey, Bela, Jr., and Miller, R.J., 1978, Map and table describing metalliferous and selected nonmetalliferous mineral deposits in the Talkeetna Mountains quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-558-B, 22 p., 1 sheet, scale 1:250,000. Csejtey, Bela, Jr., Nelson, W.H., Jones, D.L., Silberling, N.J., Dean, R.M., Morris, M.S., Lanphere, M.A., Smith, J.G., and Silberman, M.L, 1978, Reconnaissance geologic map and geochronology, Talkeetna Mountains quadrangle, northern part of Anchorage quadrangle, and southwest part of Healy quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-558-A, 60 p., 1 sheet, scale 1:250,000. MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous and selected non-metalliferous mineral deposits in the eastern part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-A, 99 p., 1 sheet, scale 1:1,000,000. Singer, D.A., Csejtey, Bela, Jr., and Miller, R.J., 1978, Map and discussion of the metalliferous and selected non-metalliferous mineral resources of the Talkeetna Mountains quadrangle, Alaska: U.S. Geological Survey Open-file Report 78-588-Q, 33 p., 1 sheet, scale 1:250,000.
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