Ruby Creek Mine, Ruby Mining District, Yukon-Koyukuk Census Area, Alaska, USAi

Regional Level Types
Ruby Creek Mine	Mine
Ruby Mining District	Mining District
Yukon-Koyukuk Census Area	Census Area
Alaska	State
USA	Country

Location: Ruby Creek is a north-flowing tributary of the Yukon River, with the town of Ruby at the confluence. The coordinates given correspond to location 2 of Cobb (1972 [MF405]) and mark the midpoint of placer grounds lying on a bench to the east of the creek. The workings are near the mouth of the creek, in section 4, T. 9 S., R. 17 E. of the Kateel River meridian. The location is accurate.
Geology: Bedrock near the mouth of Ruby Creek is limestone, slate, and schist (Maddren, 1909). Unconsolidated deposits include muck, loamy sand, schist and slate pebbles, diabase cobbles, and rounded diorite boulders 12 to 18 inches in diameter (Maddren, 1909). Vein quartz boulders and a small amount of cassiterite are present in stream gravels (Eakin, 1914 [B578]; Mertie and Harrington, 1916; Chapman and others, 1963). The gold is found at a depth of about 25 feet in discontinuous, thin, sandy layers in gravel (Maddren, 1909). The placer deposits are confined to a small bench on the right side of the stream near the mouth (Eakin, 1914). Ruby Creek is the site of the first placer gold discovered in the Ruby mining district; gold was found along the creek in 1907 (Eakin, 1914 [B578]; Brooks, 1908). Mining began in 1908 and continued until about 1915 (Eberlein and others, 1977). Between these years, about 970 ounces of gold were recovered from the creek (Cobb and Chapman, 1981). Additional intermittent mining took place at least until 1988 (Bundtzen and others, 1986; Green and others, 1989).
Workings: Small-scale mining took place along Ruby Creek between 1907 and 1915 (Eberlein and others, 1977). Additional intermittent mining took place up until at least 1988 (Bundtzen and others, 1986; Green and others, 1989).
Age: Quaternary.
Production: Between 1907 and 1915, about $10,000 in gold (at $20.67 per ounce) was recovered from Ruby Creek (Eberlein and others, 1977), amounting to 970 ounces of gold (Cobb and Chapman, 1981).

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

Other Databases

Link to USGS - Alaska:	RB008

Other Regions, Features and Areas containing this locality

References