Vote for your favorite mineral in #MinCup26! - Quartz vs. Asagiite
It's a classic vs a newbie as the most common named mineral in the crust Quartz is up against an exceedingly-rare sea foam-green mineral discovered just a few years ago Asagiite.
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Montezuma Prospect (Threeman Mining Co.), Copper River Mining District, Valdez-Cordova Census Area, Alaska, USAi
Regional Level Types
Montezuma Prospect (Threeman Mining Co.)Prospect
Copper River Mining DistrictMining District
Valdez-Cordova Census AreaCensus Area
AlaskaState
USACountry

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Latitude & Longitude (WGS84):
60° 51' 43'' North , 146° 34' 4'' West
Latitude & Longitude (decimal):
60.86194,-146.56778
GeoHash:
G#: bdzf0z8de
GRN:
N41W54
Type:
Prospect
Köppen climate type:
Dfc : Subarctic climate
Nearest Settlements:
PlacePopulationDistance
Valdez3,870 (2017)32.1km
Mindat Locality ID:
198957
Long-form identifier:
mindat:1:2:198957:4
GUID (UUID V4):
0


Nelson and others (1985) interpret the country rocks as accreted ocean crust. Crowe and others (1992; 1993) and Sainsbury (1993) discuss the genesis of the volcanogenic massive sulfide deposits in this area. Chugach Alaska Corporation, Anchorage, Alaska has control of these lands.
Location: The Montezuma prospect is at an elevation of about 1500 feet, about 0.5 mile southeast of Copper Mountain. It is in the N1/2 sec. 1, T. 12 S., R. 8 W., of the Copper River Meridian. The site location is accurate to within 1000 ft. This prospect is shown as site C-76 in Jansons and others (1984) and as site #13 in Cobb (1972: MF-392).
Geology: The country rocks at this prospect are mafic volcanic rocks and sedimentary rocks of the Tertiary Orca Group (Nelson and others, 1985). The deposit consists of irregular lenses of quartz, chalcopyrite, pyrite, and pyrrhotite in several highly mineralized shear zones in the volcanic rocks (Mihelich and Wells, 1957). A sample from a quartz-filled shear zone one foot wide in volcanic rocks contained 0.5% Cu, 0.08 oz. Ag/ton, and 0.18 oz. Au/ton (Mihelich and Wells, 1957). Jansons and others (1984) report that chip samples contained 0.74% to 3.2% Cu, 3.2 ppm to 20 ppm Ag, and grab samples contained 125 ppm to 0.75% Cu, and 0.92 ppm to 10 ppm Ag.
Workings: Mihelich and Wells (1957) report more than 300 feet of underground workings and 900 feet of surface stripping. A sample from a quartz-filled shear zone one foot wide in volcanic rocks contained 0.5% Cu, 0.08 oz. Ag/ton, and 0.18 oz. Au/ton (Mihelich and Wells, 1957). Jansons and others (1984) report that chip samples contained 0.74% to 3.2% Cu, 3.2 ppm to 20 ppm Ag, and grab samples contained 125 ppm to 0.75% Cu, and 0.92 ppm to 10 ppm Ag.
Age: Tertiary based on the age of the host rocks.
Reserves: Inferred reserves of 200 tons @ 1.67% Cu and 9.88 ppm Ag (Jansons and others, 1984).

Commodities (Major) - Cu; (Minor) - Ag, Au
Development Status: None
Deposit Model: Cyprus massive sulfide (Cox and Singer, 1986; model 24a)

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


4 valid minerals.

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
ⓘChalcopyrite2.CB.10aCuFeS2
ⓘPyrrhotite2.CC.10Fe1-xS
ⓘPyrite2.EB.05aFeS2
Group 4 - Oxides and Hydroxides
ⓘQuartz4.DA.05SiO2

List of minerals for each chemical element

OOxygen
Oⓘ QuartzSiO2
SiSilicon
Siⓘ QuartzSiO2
SSulfur
Sⓘ ChalcopyriteCuFeS2
Sⓘ PyriteFeS2
Sⓘ PyrrhotiteFe1-xS
FeIron
Feⓘ ChalcopyriteCuFeS2
Feⓘ PyriteFeS2
Feⓘ PyrrhotiteFe1-xS
CuCopper
Cuⓘ ChalcopyriteCuFeS2

Other Databases

Link to USGS - Alaska:CV017

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

Cobb, E.H., 1972, Metallic mineral resources map of the Cordova quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-392, 1 sheet, scale 1:250,000. Crowe, D.E., Nelson, S.W., Brown, P.E., Valley, J.W., and Shanks, W.C., III, 1992 (1993), Geology and geochemistry of volcanogenic massive sulfide deposits and related igneous rocks, Prince William Sound region, south-central Alaska: Economic Geology, v. 87, no. 7, p. 1722-1746. Crowe, D.E., Nelson, S.W., Brown, P.E., Valley, J.W., and Shanks, W.C., III, 1993, Geology and geochemistry of volcanogenic massive sulfide deposits and related igneous rocks, Prince William Sound, south-central Alaska--Reply: Economic Geology, v. 88, p. 1285-1288. Jansons, Uldis, Hoekzema, R.B., Kurtak, J.M., and Fechner, S.A., 1984, Mineral occurrences in the Chugach National Forest, southcentral Alaska: U.S. Bureau of Mines Mineral Land Assessment 5-84, 218 p., 2 sheets, scale 1:250,000. Mihelich, M., and Wells, R.R., 1957, Copper mines and prospects adjacent to Landlocked Bay, Prince William Sound, Alaska: U.S. Bureau of Mines Report of Investigations 5320, 21 p. Nelson, S.W., Dumoulin, J. A., and Miller, M.L., 1985, Geologic map of the Chugach National Forest, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1645-B, 16 p., 1 sheet, scale 1:250,000. Sainsbury, C.L., 1993, Geology and geochemistry of volcanogenic massive sulfide deposits and related igneous rocks, Prince William Sound, south-central Alaska, A discussion: Economic Geology, v. 88, p. 1284-1285.
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