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Copenhagen Hill Prospect, Yukon-Koyukuk Census Area, Alaska, USAi
Regional Level Types
Copenhagen Hill ProspectProspect
Yukon-Koyukuk Census AreaCensus Area
AlaskaState
USACountry

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Latitude & Longitude (WGS84):
63° 30' 54'' North , 154° 37' 33'' West
Latitude & Longitude (decimal):
63.51500,-154.62583
GeoHash:
G#: be6136scs
GRN:
N43W52
Type:
Prospect
Köppen climate type:
Dfc : Subarctic climate
Mindat Locality ID:
197026
Long-form identifier:
mindat:1:2:197026:8
GUID (UUID V4):
0


See Pork Chop (MD031), Mystery Mountains East (MD028), Frozen Creek (MD032), and Tarn (MD027) prospects.
Location: The Copenhagen Hill prospect is situated near the summit of an isolated hill about 1 mile (1.6 km) north of Cottonwood Creek at an elevation of 2,450 feet (746 m) in Section 9, T. 23 S., R. 22 E., of the Kateel River Meridian. Location is known to within about 500 feet (152 m).
Geology: The Copenhagen Hill prospect is the western-most copper-gold showing in a seven mile (11 km)-long, northeast trending belt of porphyry-like prospects through the central Mystery Mountains (DiMarchi and others, 1997). The hornfels is intruded by several porphyry dikes. Unlike other prospects in the Mystery Mountains, sulfides such as chalcopyrite, pyrite, and pyrrhotite are found in abundance in the hornfels. Quartz-tourmaline breccias are common within a 450 feet by 300 feet (137 m by 91 m) mineralized area. The Copenhagen Hill prospect is believed to be Late Cretaceous, based on inferred isotopic age of Mystery Mountains plutonic rocks (Moll and others, 1981). No assay data was found for this summary.
Workings: Regional exploration conducted by WGM Inc. in 1978 found the Copenhagen prospect (Andrews, 1978). During 1988 to 1990, ACNC conducted exploration including an airborne geophysical survey. During 1991 to 1997, ASA Inc. continued detailed exploration work at the Copenhagen prospect and throughout the Mystery Mountains. The Copenhagen Hill prospect is believed by DiMarchi and others (1997) to represent the western-most copper-gold anomalous area in a district-wide, porphyry-style metallic zonation (DiMarchi and others, 1997). No assay data was found for this summary.
Age: The Copenhagen Hill prospect is believed to be Late Cretaceous, based on inferred isotopic age of Mystery Mountains plutonic rocks (Moll and others, 1981).
Alteration: Tourmaline.
Reserves: None.

Commodities (Major) - Cu; (Minor) - Ag, Au
Development Status: No
Deposit Model: Porphyry Cu-Au (Cox and Singer, 1986; model no. 20c)

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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 4 - Oxides and Hydroxides
ⓘQuartz4.DA.05SiO2
Unclassified
ⓘ'Tourmaline'-AD3G6 (T6O18)(BO3)3X3Z

List of minerals for each chemical element

BBoron
Bⓘ TourmalineAD3G6 (T6O18)(BO3)3X3Z
OOxygen
Oⓘ QuartzSiO2
Oⓘ TourmalineAD3G6 (T6O18)(BO3)3X3Z
SiSilicon
Siⓘ QuartzSiO2
SSulfur
Sⓘ ChalcopyriteCuFeS2
Sⓘ PyriteFeS2
FeIron
Feⓘ ChalcopyriteCuFeS2
Feⓘ PyriteFeS2
CuCopper
Cuⓘ ChalcopyriteCuFeS2

Other Databases

Link to USGS - Alaska:MD030

Other Regions, Features and Areas containing this locality

North AmericaContinent
North America PlateTectonic Plate
USA

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

Andrews, Tom, 1978, Summary of Progress, Doyon Project, Mystery Mountains (Block 10): Anchorage, Alaska, WGM Inc., 24 p. (Held by Doyon, Limited, Fairbanks, Alaska, as proprietary report 78-42). DiMarchi, J.J., and Frantz, P.S., 1997, Annual Report for 1997-Doyon Option Lands, Block 10: ASA Inc.-Montague Gold Joint Venture Report, Volume II: Unpublished report, 189 p. (Report held by Doyon, Limited, Fairbanks, Alaska.) Moll, E.J., Silberman, M.L., and Patton, W.W. Jr., 1981, Chemistry, mineralogy, and K-Ar ages of igneous and metamorphic rocks of the Medfra quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-811-C, 15 p., 2 sheets, scale 1:250,000.
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