Part of a series of low temperature zinc-lead-silver skarns associated with Bowser Creek composite pluton (see MG066, MG068 prospects).
Location: The Bowser Creek-Northeast prospect is located on a steep, north-trending spur on the north side of Bowser Creek valley; it is at an elevation of 4,700 feet to 5,100 feet (1,432 to 1,554 meters) in sec. 4, T. 24 N., R. 24 W., of the Seward Meridian. The prospect is precisely known; the reporter visited the site in 1982.
Geology: The Bowser Creek-Northeast prospect is a north-trending, elongate mineral zone that averages 7 meters wide and about 300 meters long near a small body of quartz porphyry and related felsite dikes, which are satellite intrusions of the main Bowser Creek composite pluton (Bundtzen and others, 1988). The plutonic rocks intrude a limestone-rich section of the Dillinger subterrane (Bundtzen, Harris, and Gilbert, 1997); host rocks at the Bowser Creek Northeast prospect are Late Silurian to Lower Devonian in age. A prospect map was published by Reed and Elliott (1968, C 559). According to Reed and Elliott (1968, C 559), the skarn typically consists of pyrrhotite and marmatite (iron-rich sphalerite) with abundant epidote, chlorite, clinopyroxene (hedenbergite), and quartz. Disseminated galena occurs in shear zones related to dike swarm activity. Reed and Elliott (1968, C 559) reported values from chip sample traverses as high as 357.7 grams/tonne silver, 3.4 grams/ton gold, 2.44 percent copper, 24.00 percent lead, and 22.10 percent zinc. According to Bundtzen and others (1988), the average metallic content of several 5 meter chip samples taken across the the mineralized zone was 0.35 grams/tonne gold, 244.0 grams/tonne silver, 821 ppm copper, 12.13 percent lead, and 11.13 percent zinc.
Workings: The Bowser Creek-Northeast prospect was found by the late Bruce Reed during minerals investigations for the U.S. Geological Survey in the 1960s (Reed and Elliott, 1968, C 596). Reed and Elliott (1968, C 559) reported values from chip sample traverses as high as 357.7 grams/tonne silver, 3.4 grams/tonne gold, 2.44 percent copper, 24.00 percent lead, and 22.10 percent zinc. According to Bundtzen and others (1988), the average metallic content of several 5 meter chip samples taken across the mineralized zone was 0.35 grams/tonne gold, 244.0 grams/tonne silver, 821 ppm copper, 12.13 percent lead, and 11.13 percent zinc. No surface trenching or drilling have been conducted on the property.
Age: Inferred to be Tertiary, based on a 60.4 Ma K-Ar age from quartz porphyry in the Bowser Creek pluton.
Alteration: Extensive ferricrete oxidation of pyrrhotite and marmatite-rich sulfide zones.
Reserves: None.

Commodities (Major) - Ag, Au, Pb, Zn; (Minor) - Cu, Fe
Development Status: No
Deposit Model: Lead-zinc skarn (Cox and Singer, 1986; model 18c).

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Commodity List

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Mineral List

6 valid minerals.