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Unnamed Occurrence (ARDF - BC092; Near Mt. Lewis Cass), Ketchikan District, Wrangell-Petersburg Borough, Alaska, USA

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Location: This occurrence is about 1.5 miles southwest of Mt. Lewis Cass; the mineralization appears to extend from about 2,400 to 4,100 feet in elevation and was sampled in outcrop at about 2,500 feet. It is about 0.2 mile southeast of the center of section 19, T 63 S., R. 92 E. The location is accurate.
Geology: The Mount Lewis Cass occurrence was discovered by Still and others (2002). The mineralization is near the contact of Eocene granodiorite and Mesozoic and/or Paleozoic metasedimentary and metavolcanic rocks and marble. The granodiorite contains molybdenite in narrow quartz stringers, in knots, and as disseminations. Several samples contained 1,240 and 1,558 parts per million (ppm) molybdenum. Iron-stained silicified metasedimentary and metavolcanic rocks in float on the south side of the valley contain pyrrhotite, pyrite, and chalcopyrite. Chalcopyrite-bearing samples contained 1.832 ppm to 1.35 percent copper, 289 parts per billion gold, and 17.6 ppm silver.
Workings: Discovered by Still and others (2002) during a regional mineral assessment for the Bureau of Land Management.
Age: At least some is Eocene or younger based on the age of the granodiorite host rock.
Alteration: Silicification.
Reserves: None.

Commodities (Major) - Ag, Au, Cu, Mo
Development Status: None

Mineral List

6 entries listed. 6 valid minerals.

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Elliott, R.L., and Koch, R.D., 1981, Mines, prospects, and selected metalliferous mineral occurrences in the Bradfield Canal quadrangle, Alaska. U.S. Geological Survey Open-File Report 81-728B, 23 p., 1 sheet. Still, J.C., Bittenbender, P.E., Bean, K.W., and Gensler, E.G., 2002, Mineral assessment of the Stikine area, central southeast Alaska: Bureau of Land Management Technical Report 51, 560 p.

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