Broken Neck Creek Mine, Eagle Mining District, Southeast Fairbanks Census Area, Alaska, USAi

Regional Level Types
Broken Neck Creek Mine	Mine
Eagle Mining District	Mining District
Southeast Fairbanks Census Area	Census Area
Alaska	State
USA	Country

Location: Broken Neck Creek is a small north tributary of the Seventymile River. Prindle (1905) reported that Broken Neck Creek was worked for about one-half mile upstream from the mouth. The coordinates are the approximate midpoint of this part of the creek, in section 7, T. 1 N., R. 30 E., of the Fairbanks Meridian. The location is accurate. Broken Neck Creek is locality 28 of Cobb (1972 [MF-393]), locality 7 of Eberlein and others (1977), and locality 10 of Burleigh and Lear (1994).
Geology: Broken Neck Creek flows through a narrow, steep-walled valley; the canyon walls are only 120 feet apart where the creek emerges onto the Seventymile River flats. Bedrock along the creek consists of Upper Cretaceous to Pliocene conglomerate interbedded with shale containing abundant fossil leaves (Prindle, 1905; Foster, 1976). Placer gold has been produced on the Seventymile River (see EA025) downstream from the mouth of Broken Neck Creek. In 1903, the placer workings at Broken Neck Creek were 100 feet wide, and extended about one-half mile upstream from the mouth (Prindle, 1905). The paystreak at this time was about 6 feet wide, and total production was about $10,000 (gold at $20.67 per ounce). Mining on Broken Neck Creek is sporadically reported from 1910 to 1940. Gravel worked in Broken Neck Creek was later reported to be 3 to 5 feet thick; the pay streak was 20 to 50 feet wide at the mouth of the canyon and much narrower upstream (Mertie, 1938). Work in the 1930's was confined to benches on the west side of the creek. Most of the gold on the benches was located close to and on bedrock; no coarse gold was recovered. An average of four assays of gold from the benches, collected in four separate years, was 829 parts of gold and 165 parts of silver per thousand (Mertie, 1938). Clark and Foster (1971) found anomalous lead and zinc were found in stream sediments from Broken Neck Creek.
Workings: In 1903, the placer workings at Broken Neck Creek were 100 feet wide and extended about one-half mile upstream from the mouth (Prindle, 1905). The paystreak at this time was about 6 feet wide. Mining on Broken Neck Creek is sporadically reported from 1910 to 1940. Gravel worked in Broken Neck Creek was later reported to be 3 to 5 feet thick; the pay streak was 20 to 50 feet wide at the mouth of the canyon and much narrower upstream (Mertie, 1938). Work in the 1930's was confined to benches on the west side of the creek.
Age: Quaternary.
Production: Total gold production from Broken Neck Creek as of 1903 was about $10,000 (gold at $20.67 per ounce) (Prindle, 1905). An average of four assays of gold from the benches, collected in four separate years, was 829 parts of gold and 165 parts of silver per thousand (Mertie, 1938).

Commodities (Major) - Au
Development Status: Yes; small
Deposit Model: Placer Au (Cox and Singer, 1986; model 39a).

Other Databases

Link to USGS - Alaska:	EA024

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References