Location: This occurrence is at the head of Mosman Inlet about 0.5 mile southeast of triangulation station 'Moss. It is near the center of section 16, T. 66 S., R. 83 E.

Geology: This occurrence was first reported by Pittman (1962) as a 3-feet-wide calcite vein exposed for about 10 feet on the beach and below the high-tide line. The vein has abundant garnet, chalcopyrite, pyrite, and light colored sphalerite. A sample across the vein contained 9.5 percent zinc, 0.13 percent copper, 0.41 ounce of silver per ton, and traces of gold and lead. Still and others (2002) examined the area but did not find Pittman's vein. They did find a zone of tactite with calcite, garnet, magnetite, calc-silicate minerals, and chalcopyrite.
The tactite is 0.1 to 0.7 foot thick and 3 feet long in a cliff near tidewater. Samples across the tactite contained up to 1,482 parts per billion gold, 35.4 parts per million (ppm) silver, 3,635 ppm copper, and 585 ppm zinc. The area is at or near the contact of Tertiary granite with Triassic and Cretaceous greenstone and Mesozoic or Paleozoic metasedimentary and metavolcanic rocks (Karl and others, 1999).

Workings: Apparently only sampling by government engineers and geologists.

Alteration: Occurrence at least in part is a contact metamorphic assemblage with sulfides.

Commodities (Major) - Ag, Au, Cu, Pb, Zn

Deposit Model: A calcite vein and/or tactite with silver, gold copper, and zinc minerals.

Other Databases

Link to USGS - Alaska:	PE117

Other Regions, Features and Areas containing this locality

References