Main commodities | Cu; Zn |
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Other commodities | Ag |
Ore minerals | chalcopyrite; pyrrhotite |
Quadrangle map, 1:250,000-scale | CV |
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Quadrangle map, 1:63,360-scale | D-7 |
Latitude | 60.874 |
Longitude | -146.57 |
Nearby scientific data | Find additional scientific data near this location |
Location and accuracy | This 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 site is shown as C-82 in Jansons and others (1984). |
Geologic descriptionThe 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 up to foot-thick lenses of chalcopyrite and pyrrhotite
in two-foot- to 15-foot-wide shear zones. Three chip samples contained 200 ppm to 1% Cu, 145 ppm to 0.89% Zn, and <0.2 to 6 ppm Ag; a grab sample from the dump contained 4.9% Cu, 0.49% Zn, and 50 ppm Ag (Jansons and others, 1984). | |
Geologic map unit | (-146.571997094399, 60.8734526764473) |
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Mineral deposit model | Cyprus massive sulfide (Cox and Singer, 1986; model 24a) |
Mineral deposit model number | 24a |
Age of mineralization | Probably Tertiary based on the age of the host rocks. |
Workings or exploration | One 41-foot-long adit. Three chip samples contained 200 ppm to 1% Cu, 145 ppm to 0.89% Zn, and <0.2 to 6 ppm Ag; a grab sample from the dump contained 4.9% Cu, 0.49% Zn, and 50 ppm Ag (Jansons and others, 1984). |
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Indication of production | None |
Additional commentsNelson 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. |
MRDS Number | 10307355 |
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ReferencesSainsbury, 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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Reporters | S.W. Nelson, Anchorage, AK |
Last report date | 6/10/2000 |