Unnamed Occurrence (ARDF - SK009; in the northern Chilkat Range), Skagway District, Juneau District, Haines Borough, Alaska, USA
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Geology: Gilbert (1988) collected four rock samples described as, 'skarn with pyrrhotite (60%) and chalcopyrite', 'gossan with pyrrhotite', 'black schist with pyrrhotite (20%)', and 'quartz with pyrite in shear'. The samples contain up to 4.6 ppm silver, 5,950 ppm copper, and 95 ppm cobalt. The host rocks are mafic Paleozoic metavolcanics and metasediments that include argillaceous marble. Cretaceous medium-grained hornblende diorite and foliated granodiorite are nearby (Gilbert, 1988). The mineralization is probably the same age as the nearby Cretaceous intrusive rocks.
Age: The age is inferred to be Cretaceous based upon the Cretaceous age of nearby intrusive rocks (Gilbert, 1988).
Alteration: Skarn.
Commodities (Major) - Ag, Cu; (Minor) - Co
Development Status: None
Deposit Model: Copper skarn? (Cox and Singer, 1986: model 18b?)
Mineral List
4 entries listed. 4 valid minerals.
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References
Gilbert, W.G., 1988, Preliminary geology and geochemistry of the northern Chilkat Range: Alaska Division of Geological and Geophysical Surveys Report of Investigations 88-8, 2 sheets, scale 1:36,200.
