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Stratiform massive sulfide deposits in the Mt. Henry Clay area, Southeast Alaska.
For Reference Only At Bureau Libraries 1984 :1-65
The Bureau of Mines in 1983 examined the Skagway B-4 quadrangle in southeast Alaska for volcanic host rocks similar to those that host the stratiform world class windy craggy copper-cobalt-gold deposit located across the U.S.-Canadian border 50 miles to the northwest. Such rocks were found between the Jarvis and Boundary Glaciers in what is now called the Mt. Henry Clay area. This area was mapped and investigated for stratiform deposits similar to the windy craggy deposit. Investigations indicate that the Mt. Henry Clay area massive sulfide occurrences are stratiform, have a similar mineralogy, and are in a geologic setting similar to that of the windy craggy deposit. However, the windy craggy ore zone consists predominately of pyrrhotite-pyrite-chalcopyrite while the occurrences in the Mt. Henry Clay area consist predominately of barite-sphalerite-pyrite. During 1983 the Jarvis Glacier occurrences, which contain small amounts of cobalt, were discovered in the area by Bureau personnel; commercial mining personnel discovered the important Mt. Henry Clay zinc-copper-silver-gold deposit. Investigations indicate that the Mt. Henry Clay area is highly mineralized and a target for the discovery of stratiform massive sulfide deposits.
Mining industry; Mining; Alaska; Volcanic ash; Cobalt; Copper; Gold; Mineral deposits; Minerals; Geologic strata; Rock falls; Sulfides; Zinc; Silver
7440-48-4; 7440-50-8; 7440-57-5; 7440-66-6; 7440-22-4
For Reference Only At Bureau Libraries
Alaska Field Operations Center
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division