Unnamed Occurrence (ARDF - BC092; Near Mt. Lewis Cass), Ketchikan District, Wrangell-Petersburg Borough, Alaska, USA
This page is currently not sponsored. Click here to sponsor this page.
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.
Commodities (Major) - Ag, Au, Cu, Mo
Development Status: None
6 entries listed. 6 valid minerals.
The above list contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.
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.