Location: The Silver King prospect is located on the eastern side of Colorado Creek in the northern half of sections 19 and 24, T. 19 S., R. 10 W., of the Fairbanks Meridian. The location is accurate to within 0.5 mile. The Silver King prospect is not the same as the Silver King mine shown on the Healy A-6 1:63,360-scale topographic sheet.
Geology: Thick Quaternary glacial deposits and Upper Tertiary sedimentary strata cover the bedrock in this area. The country rocks in the area of the Silver King prospect consist of Upper Jurassic to Upper Triassic(?) crystal tuff, argillite, chert, graywacke, and limestone that are intruded by Upper Cretaceous quartz diorite porphyry stocks and dikes (Wilson and others, 1998). Intrusion of the dikes and quartz-sulfide mineralization are localized along the nearby Chulitna fault. The Silver King deposit includes: tactite (skarn) replacement bodies; auriferous arsenopyrite-chalcopyrite quartz veins; stibnite-gold-silver veins; silver-lead-zinc veins; and as breccia pipes associated with porphyry stock and dikes. Sporadic mineralization is present over a 2,000 feet by 800 feet area. (Hawley and Clark, 1974). Hawley and Clark (1974) reported the following sample analyses. A massive sulfide pod in skarn contained 8.3 ounces of gold per ton. An arsenopyrite-rich vein contained 50 ppm silver, 200 ppm gold, 700 ppm cobalt, 1,500 ppm copper, 200 ppm lead, 500 ppm antimony, 200 ppm zinc, more than 1,000 ppm bismuth and more than 10,000 ppm arsenic. A stibnite-rich vein contained 10 ppm silver, 23 ppm gold, 200 ppm copper, 300 ppm lead, 1,500 ppm zinc, 7,000 ppm arsenic and more than 10,000 ppm antimony. Salisbury and Dietz (1984) reported the following: arsenopyrite veins returned assay values of 0.85 ounces of silver per ton, 0.87 ounces of gold per ton and 0.44% cobalt; and stibnite-bearing veins contained 0.12 ounces of silver per ton and 0.29 ounces of gold per ton. The Silver King deposit is part of a northeast trending mineralized zone that includes the Liberty (HE028), Lucrata (HE029) and Eagle (HE030) prospects.
Workings: Surface workings, mostly trenches and pits. Site-specific geophysical surveys noted in literature and probably drill testing, but specific data are not available. Hawley and Clark (1974) reported the following sample analyses. A massive sulfide pod in skarn contained 8.3 ounces of gold per ton. An arsenopyrite-rich vein contained 50 ppm silver, 200 ppm gold, 700 ppm cobalt, 1,500 ppm copper, 200 ppm lead, 500 ppm antimony, 200 ppm zinc, more than 1,000 ppm bismuth and more than 10,000 ppm arsenic. A stibnite-rich vein contained 10 ppm silver, 23 ppm gold, 200 ppm copper, 300 ppm lead, 1,500 ppm zinc, 7,000 ppm arsenic and more than 10,000 ppm antimony. Salisbury and Dietz (1984) reported the following: arsenopyrite veins returned assay values of 0.85 ounces of silver per ton, 0.87 ounces of gold per ton and 0.44% cobalt; and stibnite-bearing veins contained 0.12 ounces of silver per ton and 0.29 ounces of gold per ton.
Age: Similar sulfide-bearing intrusive rocks and veins in the district have been dated as Late Cretaceous (Swainbank and others, 1977), but Au-Ag-stibnite and Ag-Pb-Zn veins could be younger (Early Tertiary?).
Alteration: Skarn formation widespread; porphyry-type alteration is also reported.

Commodities (Major) - Ag, Au, Cu; (Minor) - Bi, Co, Sb
Development Status: Undetermined.
Deposit Model: Polymetallic vein, Cu-Au porphyry, Cu skarn, and Simple Sb veins (Cox and Singe

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Commodity List

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Mineral List

7 valid minerals.