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Tibbit Prospect, Copper River Mining District, Valdez-Cordova Census Area, Alaska, USAi
Regional Level Types
Tibbit ProspectProspect
Copper River Mining DistrictMining District
Valdez-Cordova Census AreaCensus Area
AlaskaState
USACountry

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Latitude & Longitude (WGS84):
60° 52' 22'' North , 146° 33' 50'' West
Latitude & Longitude (decimal):
60.87278,-146.56389
GeoHash:
G#: bdzf2ce3t
GRN:
N41W54
Type:
Prospect
Köppen climate type:
Dfc : Subarctic climate
Nearest Settlements:
PlacePopulationDistance
Valdez3,870 (2017)30.9km
Mindat Locality ID:
200349
Long-form identifier:
mindat:1:2:200349:1
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 Tibbit prospect is at an elevation of about 1600 ft., approximately 0.75 mi. northeast of Copper Mountain. It is in S1/2 sec. 36, T. 11 S., R. 8 W., of the Copper River Meridian. The location is accurate to within 1000 ft. This prospect is shown as #11 in Cobb (1972: MF-392) and as C-81 in Jansons and others (1984).
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 chalcopyrite, pyrite, and pyrrhotite in one- to eight- foot wide shear zones (Cobb, 1979: MF-392). Jansons and others (1984) report that two grab samples contained 0.59% and 2% Cu, and 1.8 ppm and 6.4 ppm Ag; two chip samples contained 430 ppm and 0.93% Cu, 240 ppm and 0.13% Zn, and 3.4 ppm and 12.7 ppm Ag. Cobb (1979: OFR 79-973) reported one assay value of 1.9 oz Au/ton.
Workings: The deposit was explored in the early 1900s by four adits and by open cuts (Cobb, 1979: MF-392). However, in the 1980s only one 20 ft. adit could be found (Jansons and others, 1984). Jansons and others (1984) report that two grab samples contained 0.59% and 2% Cu, and 1.8 ppm and 6.4 ppm Ag, and that two chip samples contained 430 ppm and 0.93% Cu, 240 ppm and 0.13% Zn, and 3.4 ppm and 12.7 ppm Ag. Cobb (1979: OFR 79-973) reported one assay value of 1.9 oz Au/ton.
Age: Probably Tertiary based on the age of the host rocks.
Reserves: Inferred reserves of 500 tons @ 0.72% Cu.

Commodities (Major) - Cu, Zn; (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


3 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

List of minerals for each chemical element

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:CV013

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. Cobb, E.H., 1979, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Cordova quadragle, Alaska: U.S. Geological Survey Open-file Report OF 79-973, 73 p. 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. 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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