Main commodities | Cu; Zn |
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Ore minerals | chalcopyrite; pyrite; pyrrhotite |
Gangue minerals | quartz |
Quadrangle map, 1:250,000-scale | CV |
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Quadrangle map, 1:63,360-scale | D-7 |
Latitude | 60.88 |
Longitude | -146.624 |
Nearby scientific data | Find additional scientific data near this location |
Location and accuracy | This prospect is at an elevation of about 200 feet approximately one mile NW of Bells Butte in the S1/2 sec. 27, T. 11 S., R. 8 W., of the Copper River Meridian. The location is accurate to within 1000 ft. This prospect is shown as C-86 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 irregular masses of quartz, chalcopyrite, pyrite, and pyrrhotite in a 30-foot-wide shear zone cutting mafic volcanic rocks (Jansons and others, 1984). The prospect was explored by two adits. One is 250 ft. long and the other is 20 ft. long. Five grab and two chip samples contained 50 ppm to 0.5% Cu and 440 ppm to 0.1% Zn (Jansons and others, 1984). | |
Geologic map unit | (-146.626006682471, 60.8794544558919) |
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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 | The prospect was explored by two adits. One is 250 ft. long and the other is 20 ft. long. Five grab and two chip samples contained 50 ppm to 0.5% Cu and 440 ppm to 0.1% Zn (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 | 10307353 |
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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 |