Mount Ripinski Prospect, Haines, Alaska, USAi

Regional Level Types
Mount Ripinski Prospect	Prospect
Haines	City Borough
Alaska	State
USA	Country

Location: This prospect is on the south side of Mt. Ripinski approximately 0.5 mile south of triangulation station '3563'. It is at an elevation of approximately 1,500 feet near the base of a steep south-facing cliff. Redman and others (1984) show this site as occurrence 1, but they were unable to locate the 100-foot adit reported to occur at this site by Robertson (1956). The location is accurate to within about 0.25 mile.
Geology: The following description is from Still and others (1991). Chalcopyrite-bornite-bearing quartz-calcite veins and chalcopyrite-bearing metabasalt occur in cliffs and in rubble beneath the cliffs on the south side of Mount Ripinski. Almost all of the quartz veins that were sampled contained low gold values, but some veins contained up to 12.0 ppm gold and 3.97% copper. The metabasalt contained up to 0.60 ppm gold and 3.50 % copper. Eighteen of the 27 samples were analyzed for platinum and palladium. They contained from 0.01 to 0.06 ppm palladium and one sample contained 0.01 ppm platinum. This site is immediately north of the Johnson Creek fault which separates metabasalt to the north from Cretaceous ultramafic rocks, including pyroxenite, to the south. Iron deposits associated with pyroxenite are also reported from this general area but no descriptions are given (Redman and others, 1984). The Cretaceous age of the metabasalts (Still and others, 1991; MacKevett and others, 1974) establishes a maximum age for the mineralization. However, based on fossil evidence from the Chilkat Peninsula to the southeast, Plafker, Hudson and Silberling (1979) and Plafker and Hudson (1980) infer a Late Triassic age for the metabasalts.
Workings: Redman and others (1984) refer to a report by Robertson (1956) of a 100-foot adit but were unable to find it.
Age: Cretaceous or younger, or Late Triassic or younger (Plafker, Hudson and Silberling, 1979; Plafker and Hudson, 1980).
Reserves: Robertson (1956) indicates that several billion tons of material with 2 to 10% iron may exist in this area.

Commodities (Major) - Au, Cu, Fe; (Minor) - Pd, Pt
Development Status: None
Deposit Model: Possible metamorphic quartz-sulfide veins in association with copper rich metab

Other Databases

Link to USGS - Alaska:	SK024

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References