Main commodities | Cu |
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Other commodities | Zn |
Ore minerals | chalcopyrite; pyrite; sphalerite |
Quadrangle map, 1:250,000-scale | LC |
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Quadrangle map, 1:63,360-scale | B-3 |
Latitude | 60.48 |
Longitude | -153.79 |
Nearby scientific data | Find additional scientific data near this location |
Location and accuracy | Locality is on the slope about 650 m NW of Otter Lake. This is locality 14 of Nelson and others (1985) and locality 22 of MacKevett and Holloway (1977). Sec. 35, T. 5 N., R. 26 W., of the Seward Meridian. Locality is accurate to within 1.6 km. Coordinates are for a point in the center of the occurrence. The occurrence is 2.6 km wide and extends 3.2km NE and SW from plotted location. |
Geologic descriptionWest of Otter Lake, chlorite schists contain interbedded argillites, cherts, and recrystallized limestone. The schist contains disseminated chalcopyrite in massive pyrite. Within the Lake Clark schist belt. MacKevett and Holloway (1977) describe the rocks as Paleozoic (?) schists, largely of volcanic derivation; inlcudes both mafic and felsic volcanic schist. Felsic meta-volcanic rocks northeast of Portage Lake (located NW of Otter Lake) are considered to be a favorable host for network type copper-zinc deposit (Resource Associates of Alaska, 1976). Limestone beds are common hosts for mineralization. | |
Geologic map unit | (-153.792237222262, 60.4793420544892) |
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Mineral deposit model | Kuroko massive sulfide? (Cox and Singer, 1986; model 28a?). |
Mineral deposit model number | 28a? |
Age of mineralization | Host is Paleozoic ? |
Alteration of deposit | Unknown |
Workings or exploration | Unknown |
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Indication of production | None |
Reserve estimates | No reserves |
Production notes | No production |
Additional commentsSite is in Lake Clark National Park and Preserve. |
MRDS Number | A013027 |
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ReferencesResource Associates of Alaska, Inc., 1976, Geology and geochemistry of certain land within the Lake Clark National Park: Contract report for U.S. Bureau of Mines, Contract JO166108, 7 v.
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Reporters | M.L. Miller (USGS); D.P. Bickerstaff (USGS) |
Last report date | 6/15/1998 |