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Unnamed Occurrence (ARDF - MH037; on peak 5480 southeast of Clearwater Creek), Valdez Creek District, Matanuska-Susitna Borough, Alaska, USA

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Location: This occurrence is near the top of peak 5480 near the center of section 1, T. 20 S., R. 4 E., Fairbanks Meridian. It corresponds to locality 8 in table 2 of Nokleberg and others (1991) and is about the same as a site sampled by Anaconda Minerals Company (Ellis, 1980). A probably related site is locality 20 of Clautice and others (1989), which is about one-quarter mile southeast of peak 5480 on the ridge crest.
Geology: The rock near the occurrence is muscovite schist, probably metarhyolite. The rocks are cut by low-angle (thrust) faults (Nokleberg and others, 1991). The deposit is a polymetallic vein rich in lead. Sample 82NK017C collected by the U.S. Geological Survey assayed 9.4 percent lead, 0.97 percent zinc, 0.27 percent copper, 47 parts per million (ppm) silver, and 15 ppm molybdenum (Nokleberg and others, 1991). A sample collected by Anaconda Minerals Company assayed 1.17 percent lead, 0.1 percent zinc, 0.305 percent copper, and 86 ppm molybdenum (Ellis, 1980). Similar mineralization was reported at a nearby site by Clautice and others (1989, their locality 20), where more than 1 percent lead, 0.52 percent zinc, and 0.26 percent copper occurred in a zone 2 to 3 inches wide in tuffaceous rock.
Workings: No extensive workings.
Age: The lead-rich vein deposit cuts muscovite schist of probable Paleozoic protolith age. The mineralization age is uncertain but possibly Cretaceous, related to widespread deformation that occurred at that time.

Commodities (Major) - Ag, Pb, Zn; (Minor) - Cu, Mo
Development Status: None
Deposit Model: Polymetallic vein (Cox and Singer, 1986; model 22c).

Mineral List



5 entries listed. 5 valid minerals.

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References

Clautice, K.H., Smith, T.E., Pessel, G.H., and Solie, D.N., 1989, Geology and mineral occurrences, upper Clearwater Creek area, Mt. Hayes A-6 quadrangle, Alaska: Alaska Division of Geological and Geophysical Surveys Public-data File 89-18, 14 p., 2 sheets, scale 1:24,000. Ellis, W.T., 1980, 1980 Alaska Range Project: Anaconda Copper Co., Anchorage, Alaska, 33 p. Nokleberg, W.J., Lange, I.M., Roback, R.C., Yeend, Warren, and Silva, S.R., 1991, Map showing locations of metalliferous lode and placer mineral occurrences, mineral deposits, prospects, and mines, Mount Hayes quadrangle, eastern Alaska Range, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1996-C, 42 p., 1 sheet, scale 1:250,000.

 
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