Unnamed (north shore, Stone Rock Bay)

Location: Alaska, United States (54.768, -132.002 approx.)

Commodities: gold; copper; rare earth elements; uranium; zinc

Deposit model: REE-bearing dikes · unclassified

Geology

Reconnaissance samples were collected at Stone Rock Bay (fig. 15, Nos. 93, 94, 96). Samples at locations 93 and 96 did not contain significant metallic values. At location 94, select samples (5197, 5198) of silicified syenite with disseminated chalcopyrite contained from 229 to 402 ppb gold and from 3,162 to 86 6,206 ppm copper. The Stone Rock Bay occurrence is on the north side of Stone Rock Bay. It consists of dikes and syenite containing uranium, cerium, lanthanum, yttrium, and other REE. This occurrence was mapped and sampled by a Bureau team during a 1984-1987 study of the area (85). Bureau investigation of this occurrence during the 1990 field season consisted of reconnaissance sampling two diabase dikes exposed at the beach. Samples (5589, 5590) of these dikes contained up to 132 ppb gold, 2,681 ppm copper, 311 ppm zinc, 1,080 ppm uranium, 14,400 ppm cerium, 7,230 ppm lanthanum, and 54 ppm yttrium. (Maas and others (1991)) REE zones at Stone Rock Bay are hosted in andesite dikes intruding quartz syenite and granite. Pyroxenite hosts quartz-carbonate veins and sulfide disseminations at the Veta and Stone Rock Bay Central prospects.; "A sample from a REE dike at the Stone Rock Bay East occurrence contained 96.8 ppm uranium, 1,830 ppm cerium, and 858 ppm lanthanum across a 1.12-m width (map No. 208-1)." (Maas and others (1995))

Exploration and site history

• Exploration — Diamond drilling, 1975 (Maas and others (1995))

Record imported from USGS USMIN ver. 4.0 (June 2019). Developments after that date appear on facility records, not here; see the methodology.